Image display device

Abstract

An image display device using quantum dots, which can have a simplified structure, is provided. [Solution] An image display device (10) is provided, comprising: a light source (20) having a light-emitting element (23); a light-shielding layer (30) arranged closer to the viewer than the light-emitting element (23) and having an opening (30A) at a position corresponding to the light-emitting element (23); a light wavelength conversion layer (40) arranged within the opening (30A) and including light wavelength conversion particles (41) and a binder resin (42); and a colored layer (60) arranged within the opening (30) and closer to the viewer than the light wavelength conversion layer (40), which transmits light whose wavelength has been converted by the light wavelength conversion particles (41) and absorbs light from the light-emitting element (23), wherein the light wavelength conversion particles (41) are first light wavelength conversion particles or the like including light-transmitting resin particles (41B) containing at least one element selected from the group consisting of sulfur, phosphorus, and nitrogen and a carboxylic acid, and quantum dots (41A) encapsulated in the resin particles (41B).

Description

Technical Field

[0001] The present invention relates to an image display device.

Background Art

[0002] In recent years, liquid crystal display devices have been mainly used as image display devices. In a liquid crystal display device, light emitted from a backlight device is used to display an image by using the shutter function of a liquid crystal cell.

[0003] Currently, in order to improve color reproducibility, incorporating quantum dots into an image display device is being considered. Quantum dots absorb light (primary light) and emit light of different wavelengths (secondary light). The wavelength of the light emitted by quantum dots mainly depends on the particle size of the quantum dots. Therefore, by using quantum dots, various colors can be reproduced while using a light source that projects light in a single wavelength range. For example, when using a light source that emits blue light, quantum dots can also absorb the blue light and emit green light and red light.

[0004] When incorporating quantum dots into an image display device, the quantum dots are often incorporated into the backlight device (see Patent Document 1). As methods of incorporating quantum dots into the backlight device, an on-chip method of incorporating quantum dots into the light source, an on-edge method of arranging a glass tube encapsulating quantum dots between the light source and the light guide plate, and an on-surface method of arranging a sheet containing quantum dots on the light-emitting side of the light guide plate are known.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Currently, in an image display device using quantum dots, simplifying the structure has been considered. However, when incorporating quantum dots into a backlight device, it is premised on using a liquid crystal cell with a shutter function. Therefore, it is substantially difficult to perform image display without using a liquid crystal cell. Substantially difficult.

[0007] The present invention has been made to solve the above problems. That is, an object of the present invention is to provide an image display device using quantum dots that can simplify the structure.

Means for Solving the Problems

[0008] The inventors of the present invention have conducted intensive research on the above problems. As a result, they have found that by arranging light-emitting elements for each sub-pixel and arranging a light wavelength conversion layer containing quantum dots at a position corresponding to the light-emitting elements, and performing a shutter function by turning the light-emitting elements on / off, image display can be achieved without using a liquid crystal cell. The present invention has been completed based on such findings. That is, by arranging a light source including one or more light-emitting elements, a light-shielding layer disposed on the observer side of the light-emitting elements and having an opening at a position corresponding to the light-emitting elements, a light wavelength conversion layer disposed in the opening and containing light wavelength conversion particles and a binder resin, and a color filter disposed in the opening and on the observer side of the light wavelength conversion layer, and wavelength-converting light by the light wavelength conversion particles.

[0009] According to one aspect of the present invention, a light source including one or more light-emitting elements, a light-shielding layer disposed on the observer side of the light-emitting elements and having an opening at a position corresponding to the light-emitting elements, a light wavelength conversion layer disposed in the opening and containing light wavelength conversion particles and a binder resin, and a color filter disposed in the opening and on the observer side of the light wavelength conversion layer, and wavelength-converting light by the light wavelength conversion particles. ​​​​​​​A colored layer that transmits the converted light and absorbs the light from the light-emitting element, and the light wave The wavelength conversion particles are light-transmissive resin particles containing at least one element selected from the group consisting of sulfur, phosphorus, and nitrogen and at least one of carboxylic acids, and quantum dots encapsulated in the resin particles. A first light wavelength conversion particle including quantum dots encapsulated in the resin particles, and a light-transmissive barrier particle and a second light wavelength conversion particle including quantum dots encapsulated in the barrier particle. At least one of the above is provided, and an image display device is provided.

[0010] In the above image display device, the first light wavelength conversion particle may further include a barrier layer covering the surface of the resin particle.

[0011] In the above image display device, the barrier particles may be inorganic oxide particles.

[0012] In the above image display device, the light source may further include one or more packages having recesses, the light-emitting element is disposed in the recesses, and the distance from the light-shielding layer to the portion of the package corresponding to the light-shielding layer may be 10 μm or less.

[0013] According to another aspect of the present invention, a light source including a package having a recess and a light-emitting element disposed in the recess, a light-shielding layer disposed on the observer side of the light-emitting element and having an opening at a position corresponding to the light-emitting element, a light wavelength conversion layer disposed in the opening and including quantum dots and a binder resin, and a colored layer disposed in the opening and on the observer side of the light wavelength conversion layer, the colored layer transmitting the light wavelength-converted by the quantum dots and absorbing the light from the light-emitting element, and the distance from the light-shielding layer to the portion of the package corresponding to the light-shielding layer. ​​​​​​​​The distance to the image display device is 10 μm or less.

[0014] According to another aspect of the present invention, a light source having one or more light emitting elements and a viewing light source having a viewing angle greater than the light emitting elements. A pair of barrier members arranged facing each other on the observer side, and a barrier member is arranged between the barrier members, a light-shielding layer having an opening at a position corresponding to the light-emitting element; and a light-shielding layer disposed within the opening; a light wavelength conversion layer including quantum dots and a binder resin; the quantum dots are arranged on the side closer to the observer than the front surface of the and a first colored layer that absorbs the light from the light emitting element.

[0015] In the image display device, a barrier member on the light source side and the light wavelength conversion layer are a light emitting element that transmits light emitted from the light emitting element and has a wavelength converted by the quantum dots; It may further comprise a second light absorbing colored layer. Effect of the Invention

[0016] According to one or another aspect of the present invention, a quantum dot semiconductor device capable of simplifying the structure is provided. It is possible to provide an image display device using the same. [Brief description of the drawings]

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0018] [First Embodiment] Hereinafter, an image display device according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of the image display device according to the present embodiment, and FIG. 2 is a schematic configuration diagram of the wavelength-converting particles shown in FIG. 1. FIGS. 3 and 5 are schematic configuration diagrams of other image display devices according to the present embodiment. FIG. 4 is a schematic configuration diagram of the wavelength-converting particles shown in FIG. 3. <<<Image Display Device>>> The image display device 10 shown in FIG. 1 includes a light source 20 including one or more light-emitting elements 23, a light-shielding layer 30 disposed on the observer side of the light-emitting element 23 and having openings 30A, 30B, and 30C at positions corresponding to the light-emitting element 23, wavelength-converting layers 40 and 45 disposed in the openings 30A and 30B, a light-diffusing layer 50 disposed in the opening 30C, coloring layers 60 and 65 disposed in the openings 30A and 30B and on the observer side of the wavelength-converting layers 40 and 45, and a coloring layer 70 disposed in the opening 30C and on the observer side of the light-diffusing layer 50. The image display device 10 may not include the light-diffusing layer 50, the coloring layer 70, the barrier member 80, and the circular polarizing plate 90. Further, in the present embodiment, the wavelength-converting layers 40 and 45 are used, but either one of them may be used. Furthermore, the light-shielding layer 30 has openings 30A,

[0019] <<<<Image Display Device>>>> The image display device 10 shown in FIG. 1 includes a light source 20 having one or more light-emitting elements 23, and is disposed on the observer side of the light-emitting element 23, and has openings 30A, 30B and 30C at positions corresponding to the light-emitting element 23, a light-shielding layer 30, wavelength-converting layers 40 and 45 disposed in the openings 30A and 30B , a light-diffusing layer 50 disposed in the opening 30C, coloring layers 60 and 65 disposed in the openings 30A and 30B and on the observer side of the wavelength-converting layers 40 and 45, and a coloring layer 70 disposed in the opening 30C and on the observer side of the light-diffusing layer 50. The image display device 10 is provided with a barrier member 80 and a circular polarizing plate 90 in this order toward the observer side of the coloring layers 60 and 70. The image display device 10 may not include the light-diffusing layer 50, the coloring layer 70, the barrier member 80, and the circular polarizing plate 90. Also, in the present embodiment, the wavelength-converting layers 40 and 45 are used, but either one of them may be sufficient. Further, the light-shielding layer 30 has openings 30A, toward the observer side of the coloring layers 60 and 70, and is provided with a barrier member 80 and a circular polarizing plate 90 in this order. The image display device 10 may not include the light-diffusing layer 50, the coloring layer 70, the barrier member 80, and the circular polarizing plate 90. In addition, in this embodiment, the wavelength-converting layers 40 and 45 are used, but either one of them may be used. Furthermore, the light-shielding layer 30 has openings 30A, 45, but either one of them may be used. Furthermore, the light-shielding layer 30 has openings 30A, Although 30B and 30C are provided, as for the opening, either one of the openings 30A and 30B may exist. The light source 20 is integrated with the light shielding layer 30, the light wavelength conversion layers 40, 45, etc., through the light transmissive adhesive layer 95.

[0020] <<Light Source>> The light source 20 includes one or more light emitting element packages 21 and a substrate 22 on which the light emitting element packages 21 are mounted. The light emitting element packages 21 are arranged for each sub-pixel. A sub-pixel is, for example, each display portion corresponding to red, green, and blue when performing color display. In this case, with three of a red sub-pixel, a green sub-pixel, and a blue sub-pixel as a unit, it becomes one pixel. The light emitting element package 21 includes a light emitting element 23 and a package 24 having a concave portion 24A.

[0021] <Light Emitting Element> Examples of the light emitting element 23 include a light emitting diode element (LED element) and a laser diode element (LD element). As the light emitting element, a light emitting element that emits light in a single wavelength range can be used. In this embodiment, the light emitting element 23 is a blue light emitting diode (blue LED) that emits blue light.

[0022] <Package> The package 24 has a concave portion 24A, and the light emitting element 23 is disposed in the concave portion 24A. The package 24 includes a package body 24B, an electrode layer 24C, and a wire 24D. The light emitting element 24 is electrically connected to the electrode layer 24C via the wire 24D.

[0023] <<Light Shielding Layer>> The light-shielding layer 30 is also called a black matrix layer that is divided for each sub-pixel. . The light-shielding layer 30 contains a black coloring material and a binder resin. The light-shielding layer 30 is a barrier member provided on the surface on the light source 20 side in the barrier member 80 and extends toward the light source 20 side. The light-shielding layer 30 is formed in a lattice shape. The "lattice shape" in this specification means a structure in which a plurality of openings are arranged in a matrix in a plan view of the light-shielding layer . Examples of the shape of the opening in the plan view of the light-shielding layer include polygonal shapes such as a square shape, an elliptical shape, a circular shape, etc. . Examples of the above square shape include a square shape, a rectangular shape, etc.

[0024] The film thickness of the light-shielding layer 30 is preferably 1 μm or more and 100 μm or less. If the film thickness of the light-shielding layer 30 is 1 μm or more, color mixing with adjacent sub-pixels can be suppressed, and if it is 100 μm or less, it becomes easy to form a fine pattern. The film thickness of the light-shielding layer 30 is measured by using a scanning electron microscope (SEM) to photograph the cross-section of the light-shielding layer 30, and the film thickness of the light-shielding layer 30 is measured at 20 locations in the image of the cross-section, and the average value of the film thicknesses at the 20 locations is taken. The lower limit of the film thickness of the light-shielding layer 30 is more preferably 2 μm or more, and the upper limit is more preferably 20 μm or less.

[0025] The distance d from the light-shielding layer 30 to the portion of the package 24 corresponding to the light-shielding layer 30 shown in FIG. 1 is preferably 10 μm or less. If this distance d is 10 μm or less, the light wavelength-converted by the quantum dots 41A, 46A described later can be suppressed from entering other sub-pixels, so that color mixing can be suppressed. The distance d is more preferably 0 μm . . Preferably. When the distance d is 0 μm, the light-shielding layer 30 is in contact with the package 24. Note that In this embodiment, although the light wavelength conversion particles 41 and 46 are used, when the distance from the light-shielding layer to the corresponding part of the package is set to 10 μm or less, the light wavelength conversion layer only needs to contain quantum dots and a binder resin, and it is not necessarily required to use light wavelength conversion particles.

[0026] <Black pigment Examples of the black pigment include those generally used for the light-shielding layer 30 of the color filter, and either a pigment or a dye can be used. For example, carbon black, titanium black, etc. can be mentioned. The content of the black pigment in the light-shielding layer only needs to obtain the desired light-shielding property, and can be the same as that of a general light-shielding layer in a color filter.

[0027] <Binder resin The binder resin is appropriately selected according to the method for forming the light-shielding layer 30. In the case of the photolithography method, as the binder resin, for example, a photosensitive resin having a reactive vinyl group such as an acrylate-based, methacrylate-based, polyvinyl cinnamate-based, or cyclized rubber-based resin is used. In the case of the printing method or the inkjet method, as the binder resin, for example, polymethyl methacrylate resin, polyacrylate resin, polycarbonate resin, polyvinyl alcohol resin, polyvinyl pyrrolidone resin, hydroxyethyl cellulose resin, carboxymethyl cellulose resin, polyvinyl chloride resin, melamine resin, phenol resin, alkyd resin, epoxy resin, polyurethane resin, polyester resin, maleic acid resin, polyamide resin, etc. can be mentioned.

[0028] <<Light wavelength conversion layer>> The light wavelength conversion layers 40 and 45 have a function of converting the wavelength of incident light into other wavelengths. In this embodiment, the light wavelength conversion layer 40 has a function of converting blue light into green light, and the light wavelength conversion layer 45 has a function of converting blue light into red light. The light wavelength conversion layer 40 includes light wavelength conversion particles 41 and a binder resin 42, and the light wavelength conversion layer 45 includes light wavelength conversion particles 46 and a binder resin 47. The light wavelength conversion layers 40 and 45 may include light scattering particles in addition to the light wavelength conversion particles 41, 46 and the binder resins 42, 47. That's okay.

[0029] Preferably, the film thicknesses of the light wavelength conversion layers 40 and 45 are each 1 μm or more and 50 μm or less. If the film thicknesses of the light wavelength conversion layers 40 and 45 are 1 μm or more, sufficient light wavelength conversion efficiency can be obtained, and if they are 50 μm or less, it is suitable for thinning the image display device. The film thicknesses of the light wavelength conversion layers 40 and 45 can be measured by the same method as the film thickness of the light shielding layer 30. More preferably, the lower limit of the film thicknesses of the light wavelength conversion layers 40 and 45 is 2 μm or more, and the upper limit is more preferably 20 μm or less. The film thicknesses of the light wavelength conversion layers 40 and 45 can be measured by the same method as the film thickness of the light shielding layer 30. More preferably, the lower limit of the film thicknesses of the light wavelength conversion layers 40 and 45 is 2 μm or more, and the upper limit is more preferably 20 μm or less.

[0030] <<Light wavelength conversion particles>> As shown in FIGS. 2(A) and 2(B), the light wavelength conversion particles 41 and 46 include resin particles 41B and 46B containing at least one element selected from the group consisting of sulfur, phosphorus, and nitrogen (hereinafter, this element is referred to as "specific element".) and a carboxylic acid, and one or more quantum dots 41A and 46A encapsulated in the resin particles 41B. The light wavelength conversion particles 41 and 46 shown in FIGS. 2(A) and 2(B) are the resin particles 41B and 46B ) and the light wavelength conversion particles 41 and 46 shown in FIG. 2(B) are the resin particles 41B and 46B It further includes coating layers 41C and 46C that cover the surface. The light wavelength conversion particles 41 and 46 may not include the coating layers 41C and 46C as long as they include quantum dots 41A and 46A and resin particles 41B and 46B. In the light wavelength conversion particles 41 and 46, it is preferable that the content of a specific element in the light wavelength conversion particles 41 and 46 measured by X-ray fluorescence analysis (XRF) is 0.5 mass% or more. If the content of the specific element is 0.5 mass% or more, the deterioration of the quantum dots 41A and 46A can be more suppressed. The measurement of the content of the specific element can be performed by using an X-ray fluorescence analyzer (product name: "EDX-800HS", manufactured by Shimadzu Corporation). The content of the specific element is the average value of the values obtained by measuring three times. The lower limit of the content of the specific element in the light wavelength conversion particles 41 and 46 measured by X-ray fluorescence analysis (XRF) is more preferably 1 mass% or more, and the upper limit of the content of the specific element is more preferably 20 mass% or less, and even more preferably 10 mass% or less. If the content of the specific element is 20 mass% or less, sufficient curing can be performed during the formation of the light wavelength conversion particles. When the light wavelength conversion particles contain two or more specific elements, the above content means the total content of the specific elements. 46C.

[0031] In the light wavelength conversion particles 41 and 46, the content of a specific element in the light wavelength conversion particles 41 and 46 measured by X-ray fluorescence analysis (XRF) is preferably 0.5 mass% or more. If the content of the specific element is 0.5 mass% or more, the deterioration of the quantum dots 41A and 46A can be more suppressed. The measurement of the content of the specific element can be performed by using an X-ray fluorescence analyzer (product name: "EDX-800HS", manufactured by Shimadzu Corporation). The content of the specific element is the average value of the values obtained by measuring three times. The lower limit of the content of the specific element in the light wavelength conversion particles 41 and 46 measured by X-ray fluorescence analysis (XRF) is more preferably 1 mass% or more, and the upper limit of the content of the specific element is more preferably 20 mass% or less, and even more preferably 10 mass% or less. If the content of the specific element is 20 mass% or less, sufficient curing can be performed during the formation of the light wavelength conversion particles. When the light wavelength conversion particles contain two or more specific elements, the above content means the total content of the specific elements. It is preferable that the average particle diameter of the light wavelength conversion particles 41 and 46 is 2 times or more the average particle diameter of the quantum dots 41A and 46A. When the average particle diameter of the light wavelength conversion particles 41 and 46 is 2 times or more the average particle diameter of the quantum dots 41A and 46A, a sufficient distance from the quantum dots 41A and 46A to the surface of the light wavelength conversion particles 41 and 46 can be ensured,

[0032] so that the quantum dots are protected from moisture and oxygen. It is preferable that the average particle diameter of the light wavelength conversion particles 41 and 46 is 2 times or more the average particle diameter of the quantum dots 41A and 46A. When the average particle diameter of the light wavelength conversion particles 41 and 46 is 2 times or more the average particle diameter of the quantum dots 41A and 46A, a sufficient distance from the quantum dots 41A and 46A to the surface of the light wavelength conversion particles 41 and 46 can be ensured, so that the quantum dots are protected from moisture and oxygen. Deterioration of dots 41A and 46A can be further suppressed. The average particle size of the optical wavelength conversion particles 41 and 46 can be obtained by measuring the particle sizes of 20 optical wavelength conversion particles in the observation of the optical wavelength conversion particles by a transmission electron microscope (TEM) or a scanning transmission electron microscope (STEM) and calculating the average value thereof. Also, the average particle size of the quantum dots 41A and 46A can be obtained by measuring the particle sizes of 20 quantum dots in the cross-sectional observation of the optical wavelength conversion particles by a transmission electron microscope or a scanning transmission electron microscope and calculating the average value thereof. can be obtained by measuring the particle sizes of 20 optical wavelength conversion particles in the observation of the optical wavelength conversion particles by a transmission electron microscope (TEM) or a scanning transmission electron microscope (STEM) and calculating the average value thereof. It can be determined by calculating the average value. Also, the average particle size of the quantum dots 41A and 46A can be determined by measuring the particle sizes of 20 quantum dots in the cross-sectional observation of the optical wavelength conversion particles by a transmission electron microscope or a scanning transmission electron microscope and calculating the average value. It can be obtained by measuring the particle sizes of 20 quantum dots in the cross-sectional observation of the optical wavelength conversion particles by a transmission electron microscope or a scanning transmission electron microscope and calculating the average value. It can be obtained by measuring the particle sizes of 20 quantum dots in the cross-sectional observation of the optical wavelength conversion particles by a transmission electron microscope or a scanning transmission electron microscope and calculating the average value.

[0033] The average particle size of the optical wavelength conversion particles 41 and 46 is preferably 10 nm or more and 100 μm or less. If the average particle size of the optical wavelength conversion particles is 10 nm or more, deterioration of the quantum dots can be more suppressed, and if it is 100 μm or less, there will be no problem in terms of deterioration of dispersibility or processing of the optical wavelength conversion member. The lower limit of the average particle size of the optical wavelength conversion particles 41 and 46 is preferably 20 nm or more, and the upper limit of the average particle size of the optical wavelength conversion particles 41 and 46 is preferably 30 μm or less, more preferably 10 μm or less. If the average particle size of the optical wavelength conversion particles is 10 nm or more, deterioration of the quantum dots can be more suppressed, and if it is 100 μm or less, there will be no problem in terms of deterioration of dispersibility or processing of the optical wavelength conversion member. If the average particle size of the optical wavelength conversion particles is 10 nm or more, deterioration of the quantum dots can be more suppressed, and if it is 100 μm or less, there will be no problem in terms of deterioration of dispersibility or processing of the optical wavelength conversion member. The lower limit of the average particle size of the optical wavelength conversion particles 41 and 46 is preferably 20 nm or more, and the upper limit of the average particle size of the optical wavelength conversion particles 41 and 46 is preferably 30 μm or less, more preferably 10 μm or less. The lower limit of the average particle size of the optical wavelength conversion particles 41 and 46 is preferably 20 nm or more, and the upper limit of the average particle size of the optical wavelength conversion particles 41 and 46 is preferably 30 μm or less, more preferably 10 μm or less. The lower limit of the average particle size of the optical wavelength conversion particles 41 and 46 is preferably 20 nm or more, and the upper limit of the average particle size of the optical wavelength conversion particles 41 and 46 is preferably 30 μm or less, more preferably 10 μm or less.

[0034] The shapes of the optical wavelength conversion particles 41 and 46 are not particularly limited, and examples thereof include spherical (true spherical, substantially true spherical, elliptical spherical, etc.), polyhedral, rod-shaped (cylindrical, prismatic, etc.), flat plate-shaped, flaky, irregular-shaped, etc. When the shape of the optical wavelength conversion particle 1 is not spherical, the particle size of the optical wavelength conversion particles 41 and 46 can be set to the value of a true sphere having the same volume. When the shape of the optical wavelength conversion particle 1 is not spherical, the particle size of the optical wavelength conversion particles 41 and 46 can be set to the value of a true sphere having the same volume. When the shape of the optical wavelength conversion particle 1 is not spherical, the particle size of the optical wavelength conversion particles 41 and 46 can be set to the value of a true sphere having the same volume.

[0035] The optical wavelength conversion particles 41 and 46 each contain one or more quantum dots 41A and 46A. It is preferably the case. If the number of quantum dots contained in one light wavelength conversion particle is 1 or more, the brightness will not decrease. The number of quantum dots contained in one light wavelength conversion particle is randomly photographed at a magnification of 100,000 to 500,000 times the cross-section of 20 light wavelength conversion particles using a transmission electron microscope or a scanning transmission electron microscope, and the number of quantum dots contained in one light wavelength conversion particle is calculated from the obtained cross-sectional image, and the average value of the calculated number of quantum dots is calculated and obtained in this way.

[0036] The light wavelength conversion particles 41 and 46 each contain two or more quantum dots 41A and 46A per particle, and it is preferable that the average distance between the quantum dots 41A and 46A in one light wavelength conversion particle 41 and 46 is 1 nm or more. If the average distance between the quantum dots is 1 nm or more, there is no risk of a decrease in luminous efficiency due to concentration quenching that causes quenching due to energy transfer between the quantum dots. The average distance between the quantum dots is randomly selected from 20 lights using a transmission electron microscope or a scanning transmission electron microscope The cross-section of the wavelength conversion particle is photographed at a magnification of 100,000 to 500,000 times, and the distance between the quantum dots is calculated from the obtained cross-sectional image, and the average value of the calculated distance between the quantum dots is calculated to obtain it. The upper limit of the average distance between the quantum dots 41A and 46A is more preferably 100 nm or less.

[0037] <Quantum dot> The quantum dots 41A and 46A are nano-sized semiconductor particles having a quantum confinement effect. The particle diameter and average particle of the quantum dots 41A and 46A ​​​​​​The diameter is, for example, 1 nm or more and 20 nm or less. When quantum dots 41A and 46A absorb light from an excitation source and reach an energy-excited state, they emit energy corresponding to the energy band gap of quantum dots 41A and 46A. Therefore, by adjusting the particle diameter or the composition of the substance of quantum dots 41A and 46A, the energy band gap can be adjusted, and energy in various wavelength bands can be obtained. In particular, quantum dots 41A and 46A can generate strong fluorescence in a narrow wavelength band. When quantum dots 41A and 46A absorb light from an excitation source and reach an energy-excited state, they emit energy corresponding to the energy band gap of quantum dots 41A and 46A. Therefore, by adjusting the particle diameter or the composition of the substance of quantum dots 41A and 46A, the energy band gap can be adjusted, and energy in various wavelength bands can be obtained. In particular, quantum dots 41A and 46A can generate strong fluorescence in a narrow wavelength band. Therefore, by adjusting the particle diameter or the composition of the substance of quantum dots 41A and 46A, the energy band gap can be adjusted, and energy in various wavelength bands can be obtained. In particular, quantum dots 41A and 46A can generate strong fluorescence in a narrow wavelength band. Specifically, as the particle diameter of the quantum dots decreases, the energy band gap increases. That is, as the crystal size decreases, the emitted light of quantum dots 41A and 46A shifts to the blue side, that is, to the high-energy side. Therefore, by changing the particle diameter of quantum dots 41A and 46A, the emission wavelength can be adjusted over the entire wavelength range of the spectra in the ultraviolet region, visible region, and infrared region. For example, when the quantum dots are composed of CdSe / ZnS described later, when the particle diameter of the quantum dots is 2.0 nm or more and 4.0 nm or less, blue light is emitted, when the particle diameter of the quantum dots is 3.0 nm or more and 6.0 nm or less, green light is emitted, and when the particle diameter of the quantum dots is 4.5 nm or more and 10.0 nm or less, red light is emitted. "Blue light" in this specification refers to light having a wavelength range of 380 nm or more and less than 480 nm, "green light" refers to light having a wavelength range of 480 nm or more and less than 590 nm, and "red light" refers to light having a wavelength range of 590 nm or more and 750 nm or less. Also, the light intensity of each of the above lights is measured by a spectro-radiance meter (for example, product name "CS2000"). Specifically, as the particle diameter of the quantum dots decreases, the energy band gap increases. That is, as the crystal size decreases, the emitted light of quantum dots 41A and 46A shifts to the blue side, that is, to the high-energy side. Therefore, by changing the particle diameter of quantum dots 41A and 46A, the emission wavelength can be adjusted over the entire wavelength range of the spectra in the ultraviolet region, visible region, and infrared region. For example, when the quantum dots are composed of CdSe / ZnS described later, when the particle diameter of the quantum dots is 2.0 nm or more and 4.0 nm or less, blue light is emitted, when the particle diameter of the quantum dots is 3.0 nm or more and 6.0 nm or less, green light is emitted, and when the particle diameter of the quantum dots is 4.5 nm or more and 10.0 nm or less, red light is emitted. "Blue light" in this specification refers to light having a wavelength range of 380 nm or more and less than 480 nm, "green light" refers to light having a wavelength range of 480 nm or more and less than 590 nm, and "red light" refers to light having a wavelength range of 590 nm or more and 750 nm or less. Also, the light intensity of each of the above lights is measured by a spectro-radiance meter (for example, product name "CS2000").

[0038] Specifically, as the particle diameter of the quantum dots decreases, the energy band gap increases. That is, as the crystal size decreases, the emitted light of quantum dots 41A and 46A shifts to the blue side, that is, to the high-energy side. Therefore, by changing the particle diameter of quantum dots 41A and 46A, the emission wavelength can be adjusted over the entire wavelength range of the spectra in the ultraviolet region, visible region, and infrared region. For example, when the quantum dots are composed of CdSe / ZnS described later, when the particle diameter of the quantum dots is 2.0 nm or more and 4.0 nm or less, blue light is emitted, when the particle diameter of the quantum dots is 3.0 nm or more and 6.0 nm or less, green light is emitted, and when the particle diameter of the quantum dots is 4.5 nm or more and 10.0 nm or less, red light is emitted. "Blue light" in this specification refers to light having a wavelength range of 380 nm or more and less than 480 nm, "green light" refers to light having a wavelength range of 480 nm or more and less than 590 nm, and "red light" refers to light having a wavelength range of 590 nm or more and 750 nm or less. Also, the light intensity of each of the above lights is measured by a spectro-radiance meter (for example, product name "CS2000"). Specifically, as the particle diameter of the quantum dots decreases, the energy band gap increases. That is, as the crystal size decreases, the emitted light of quantum dots 41A and 46A shifts to the blue side, that is, to the high-energy side. Therefore, by changing the particle diameter of quantum dots 41A and 46A, the emission wavelength can be adjusted over the entire wavelength range of the spectra in the ultraviolet region, visible region, and infrared region. For example, when the quantum dots are composed of CdSe / ZnS described later, when the particle diameter of the quantum dots is 2.0 nm or more and 4.0 nm or less, blue light is emitted, when the particle diameter of the quantum dots is 3.0 nm or more and 6.0 nm or less, green light is emitted, and when the particle diameter of the quantum dots is 4.5 nm or more and 10.0 nm or less, red light is emitted. "Blue light" in this specification refers to light having a wavelength range of 380 nm or more and less than 480 nm, "green light" refers to light having a wavelength range of 480 nm or more and less than 590 nm, and "red light" refers to light having a wavelength range of 590 nm or more and 750 nm or less. Also, the light intensity of each of the above lights is measured by a spectro-radiance meter (for example, product name "CS2000"). Specifically, as the particle diameter of the quantum dots decreases, the energy band gap increases. That is, as the crystal size decreases, the emitted light of quantum dots 41A and 46A shifts to the blue side, that is, to the high-energy side. Therefore, by changing the particle diameter of quantum dots 41A and 46A, the emission wavelength can be adjusted over the entire wavelength range of the spectra in the ultraviolet region, visible region, and infrared region. For example, when the quantum dots are composed of CdSe / ZnS described later, when the particle diameter of the quantum dots is 2.0 nm or more and 4.0 nm or less, blue light is emitted, when the particle diameter of the quantum dots is 3.0 nm or more and 6.0 nm or less, green light is emitted, and when the particle diameter of the quantum dots is 4.5 nm or more and 10.0 nm or less, red light is emitted. "Blue light" in this specification refers to light having a wavelength range of 380 nm or more and less than 480 nm, "green light" refers to light having a wavelength range of 480 nm or more and less than 590 nm, and "red light" refers to light having a wavelength range of 590 nm or more and 750 nm or less. Also, the light intensity of each of the above lights is measured by a spectro-radiance meter (for example, product name "CS2000"). Specifically, as the particle diameter of the quantum dots decreases, the energy band gap increases. That is, as the crystal size decreases, the emitted light of quantum dots 41A and 46A shifts to the blue side, that is, to the high-energy side. Therefore, by changing the particle diameter of quantum dots 41A and 46A, the emission wavelength can be adjusted over the entire wavelength range of the spectra in the ultraviolet region, visible region, and infrared region. For example, when the quantum dots are composed of CdSe / ZnS described later, when the particle diameter of the quantum dots is 2.0 nm or more and 4.0 nm or less, blue light is emitted, when the particle diameter of the quantum dots is 3.0 nm or more and 6.0 nm or less, green light is emitted, and when the particle diameter of the quantum dots is 4.5 nm or more and 10.0 nm or less, red light is emitted. "Blue light" in this specification refers to light having a wavelength range of 380 nm or more and less than 480 nm, "green light" refers to light having a wavelength range of 480 nm or more and less than 590 nm, and "red light" refers to light having a wavelength range of 590 nm or more and 750 nm or less. Also, the light intensity of each of the above lights is measured by a spectro-radiance meter (for example, product name "CS2000"). Specifically, as the particle diameter of the quantum dots decreases, the energy band gap increases. That is, as the crystal size decreases, the emitted light of quantum dots 41A and 46A shifts to the blue side, that is, to the high-energy side. Therefore, by changing the particle diameter of quantum dots 41A and 46A, the emission wavelength can be adjusted over the entire wavelength range of the spectra in the ultraviolet region, visible region, and infrared region. For example, when the quantum dots are composed of CdSe / ZnS described later, when the particle diameter of the quantum dots is 2.0 nm or more and 4.0 nm or less, blue light is emitted, when the particle diameter of the quantum dots is 3.0 nm or more and 6.0 nm or less, green light is emitted, and when the particle diameter of the quantum dots is 4.5 nm or more and 10.0 nm or less, red light is emitted. "Blue light" in this specification refers to light having a wavelength range of 380 nm or more and less than 480 nm, "green light" refers to light having a wavelength range of 480 nm or more and less than 590 nm, and "red light" refers to light having a wavelength range of 590 nm or more and 750 nm or less. Also, the light intensity of each of the above lights is measured by a spectro-radiance meter (for example, product name "CS2000"). Specifically, as the particle diameter of the quantum dots decreases, the energy band gap increases. That is, as the crystal size decreases, the emitted light of quantum dots 41A and 46A shifts to the blue side, that is, to the high-energy side. Therefore, by changing the particle diameter of quantum dots 41A and 46A, the emission wavelength can be adjusted over the entire wavelength range of the spectra in the ultraviolet region, visible region, and infrared region. For example, when the quantum dots are composed of CdSe / ZnS described later, when the particle diameter of the quantum dots is 2.0 nm or more and 4.0 nm or less, blue light is emitted, when the particle diameter of the quantum dots is 3.0 nm or more and 6.0 nm or less, green light is emitted, and when the particle diameter of the quantum dots is 4.5 nm or more and 10.0 nm or less, red light is emitted. "Blue light" in this specification refers to light having a wavelength range of 380 nm or more and less than 480 nm, "green light" refers to light having a wavelength range of 480 nm or more and less than 590 nm, and "red light" refers to light having a wavelength range of 590 nm or more and 750 nm or less. Also, the light intensity of each of the above lights is measured by a spectro-radiance meter (for example, product name "CS2000"). , can be measured using (manufactured by Konica Minolta). In the above, blue light The range of the particle size of the quantum dots that emit blue light and the range of the particle size of the quantum dots that emit green light partially overlap, and also the range of the particle size of the quantum dots that emit green light and the range of the particle size of the quantum dots that emit red light partially overlap. However, even for quantum dots having the same particle size, the emission color may differ depending on the size of the core of the quantum dot, so there is no contradiction.

[0039] Quantum dots 41A and 46A can generate strong fluorescence in a desired narrow wavelength range. Therefore, a backlight device using an optical wavelength conversion sheet can illuminate a display panel with light of three primary colors having excellent color purity. In this case, the display panel will have excellent color reproducibility. In the present embodiment, quantum dot 41A is one that converts blue light into green light, and quantum dot 46A is one that converts blue light into red light.

[0040] Quantum dots 41A and 46A are composed of, for example, a core made of a first semiconductor compound, and a shell that covers this core and is made of a second semiconductor compound different from the first semiconductor compound, and a ligand bonded to the surface of the shell.

[0041] Examples of the first semiconductor compound constituting the core include II-VI semiconductor compounds such as MgS, MgSe, MgTe, CaS, CaSe, CaTe, SrS, SrSe, SrTe, BaS, BaSe, BaT e, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgSe, and HgTe, and III-V semiconductor compounds such as AlN, AlP, AlAs, AlSb, G ​​aAs, GaP, GaN, GaSb, InN, InAs, InP, InSb, TiN, T III-V semiconductor compounds such as iP, TiAs and TiSb, and semiconductors such as Si, Ge and Pb Semiconductor crystals containing semiconductor compounds or semiconductors such as IV group semiconductors are exemplified. Also, semiconductor crystals containing semiconductor compounds containing three or more elements such as InGaP can be used. Among these, from the viewpoints of ease of production, controllability of particle diameter for obtaining light emission in the visible region, etc., semiconductor crystals such as CdS, CdSe, CdTe, InP, InGaP are preferable. It is.

[0042] As the second semiconductor compound constituting the shell, a semiconductor compound having a higher band gap than the first semiconductor compound constituting the core is preferably used so that excitons are confined in the core. Thereby, the light emission efficiency of the quantum dots can be enhanced. Examples of the second semiconductor compound constituting the shell include ZnS, ZnSe, CdS, GaN, Cd SSe, ZnSeTe, AlP, ZnSTe, ZnSSe and the like.

[0043] Specific combinations of the core-shell structure (core / shell) composed of the core and the shell include , for example, CdSe / ZnS, CdSe / ZnSe, CdSe / CdS, CdTe / Cd S, InP / ZnS, Gap / ZnS, Si / ZnS, InN / GaN, InP / CdS Se, InP / ZnSeTe, InGaP / ZnSe, InGaP / ZnS, Si / Al P, InP / ZnSTe, InP / ZnSSe, InGaP / ZnSTe, InGaP / ZnSSe and the like.

[0044] The ligand is for stabilizing unstable quantum dots. Examples of the ligand include sulfur-based compounds such as thiols, phosphorus-based compounds such as phosphine-based compounds or phosphine oxides, nitrogen-based compounds such as amines, carboxyl group-containing compounds, and the like. Examples thereof include compounds such as amines, carboxyl group-containing compounds, etc.

[0045] The shape of the quantum dots is not particularly limited, and may be, for example, spherical, rod-shaped, disk-shaped, or other shapes. When the shape of the quantum dots is not spherical, the particle diameter of the quantum dots can be taken as the value of a true sphere having the same volume.

[0046] Information such as the particle diameter, average particle diameter, shape, and dispersion state of the quantum dots can be obtained by a transmission electron microscope or a scanning transmission electron microscope. In addition, since the emission color of the quantum dots changes depending on the particle diameter, it is also possible to determine the particle diameter of the quantum dots from the confirmation of the emission color of the quantum dots. Regarding the crystal structure and crystallite size of the quantum dots, they can be known by X-ray diffraction (XRD). Furthermore, information regarding the particle diameter and the like of the quantum dots can also be obtained from the ultraviolet-visible (UV-Vis) absorption spectrum.

[0047] <Resin particles> The resin particles 41B and 46B contain at least one of a specific element and a carboxylic acid. The resin particles 41B and 46B may contain two or more specific elements, or may contain both a specific element and a carboxylic acid. The specific element and the carboxylic acid do not necessarily have to be fixed in the resin particles 41B and 46B, but from the viewpoint of preventing the elution of the specific element and the carboxylic acid, the resin particles 41B and 46B are bound to the resin constituting the resin particles 41B and 46B. It is preferably fixed in 46B. 46B. The resin constituting the resin particles 41B and 46BWhen fixing at least one of a specific element and a carboxylic acid, a compound containing the specific element (hereinafter, this compound is referred to as the "specific compound") and at least one of the carboxylic acids preferably have a polymerizable functional group. Examples of the polymerizable functional group include ethylenically unsaturated groups such as (meth)acryloyl group, vinyl group, allyl group, epoxy group, isocyanate group, or hydroxyl group. When at least one of the specific compound and the carboxylic acid contains an isocyanate group as the polymerizable functional group, the polymerizable compound used for forming the resin constituting the resin particles 41B and 46B contains a hydroxyl group. When at least one of the specific compound and the carboxylic acid contains a hydroxyl group as the polymerizable functional group, the polymerizable compound used for forming the resin constituting the resin particles 41B and 46B preferably contains an isocyanate group. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, it can polymerize with the polymerizable compound to fix at least one of the specific element and the carboxylic acid in the resin particles 41B and 46B. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more. Whether the resin particles 41B and 46B contain a specific element or a carboxylic acid can be confirmed as follows. First, as described later, since a ligand composed of a sulfur-based compound, a phosphorus-based compound, a nitrogen-based compound, a carboxyl group-containing compound, etc. is bonded to the surface of the shell of the quantum dot, a specific element or a carboxylic acid can be detected from the light wavelength conversion particles. When fixing at least one of a specific element and a carboxylic acid, a compound containing the specific element (hereinafter, this compound is referred to as the "specific compound") and at least one of the carboxylic acids preferably have a polymerizable functional group. Examples of the polymerizable functional group include ethylenically unsaturated groups such as (meth)acryloyl group, vinyl group, allyl group, epoxy group, isocyanate group, or hydroxyl group. When at least one of the specific compound and the carboxylic acid contains an isocyanate group as the polymerizable functional group, the polymerizable compound used for forming the resin constituting the resin particles 41B and 46B contains a hydroxyl group. When at least one of the specific compound and the carboxylic acid contains a hydroxyl group as the polymerizable functional group, the polymerizable compound used for forming the resin constituting the resin particles 41B and 46B preferably contains an isocyanate group. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, it can polymerize with the polymerizable compound to fix at least one of the specific element and the carboxylic acid in the resin particles 41B and 46B. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more. 、(meth)acryloyl group, vinyl group, allyl group and other ethylenically unsaturated groups, epoxy group, isocyanate group, or hydroxyl group. When at least one of the specific compound and the carboxylic acid contains an isocyanate group as the polymerizable functional group, the polymerizable compound used for forming the resin constituting the resin particles 41B and 46B contains a hydroxyl group. When at least one of the specific compound and the carboxylic acid contains a hydroxyl group as the polymerizable functional group, the polymerizable compound used for forming the resin constituting the resin particles 41B and 46B preferably contains an isocyanate group. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, it can polymerize with the polymerizable compound to fix at least one of the specific element and the carboxylic acid in the resin particles 41B and 46B. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more. When at least one of the specific compound and the carboxylic acid contains an isocyanate group as the polymerizable functional group, the polymerizable compound used for forming the resin constituting the resin particles 41B and 46B contains a hydroxyl group. When at least one of the specific compound and the carboxylic acid contains a hydroxyl group as the polymerizable functional group, the polymerizable compound used for forming the resin constituting the resin particles 41B and 46B preferably contains an isocyanate group. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, it can polymerize with the polymerizable compound to fix at least one of the specific element and the carboxylic acid in the resin particles 41B and 46B. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more. When at least one of the specific compound and the carboxylic acid contains an isocyanate group as the polymerizable functional group, the polymerizable compound used for forming the resin constituting the resin particles 41B and 46B contains a hydroxyl group. When at least one of the specific compound and the carboxylic acid contains a hydroxyl group as the polymerizable functional group, the polymerizable compound used for forming the resin constituting the resin particles 41B and 46B preferably contains an isocyanate group. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, it can polymerize with the polymerizable compound to fix at least one of the specific element and the carboxylic acid in the resin particles 41B and 46B. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, it can polymerize with the polymerizable compound to fix at least one of the specific element and the carboxylic acid in the resin particles 41B and 46B. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, it can polymerize with the polymerizable compound to fix at least one of the specific element and the carboxylic acid in the resin particles 41B and 46B. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, it can polymerize with the polymerizable compound to fix at least one of the specific element and the carboxylic acid in the resin particles 41B and 46B. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, it can polymerize with the polymerizable compound to fix at least one of the specific element and the carboxylic acid in the resin particles 41B and 46B. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, it can polymerize with the polymerizable compound to fix at least one of the specific element and the carboxylic acid in the resin particles 41B and 46B. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more. When at least one of the specific compound and the carboxylic acid contains a polymerizable functional group, at least one of the specific compound and the carboxylic acid may contain one or more polymerizable functional groups, or may contain two or more.

[0048] Whether the resin particles 41B and 46B contain a specific element or a carboxylic acid can be confirmed as follows. First, as described later, since a ligand composed of a sulfur-based compound, a phosphorus-based compound, a nitrogen-based compound, a carboxyl group-containing compound, etc. is bonded to the surface of the shell of the quantum dot, a specific element or a carboxylic acid can be detected from the light wavelength conversion particles. Whether the resin particles 41B and 46B contain a specific element or a carboxylic acid can be confirmed as follows. First, as described later, since a ligand composed of a sulfur-based compound, a phosphorus-based compound, a nitrogen-based compound, a carboxyl group-containing compound, etc. is bonded to the surface of the shell of the quantum dot, a specific element or a carboxylic acid can be detected from the light wavelength conversion particles. Since a ligand composed of a sulfur-based compound, a phosphorus-based compound, a nitrogen-based compound, a carboxyl group-containing compound, etc. is bonded to the surface of the shell of the quantum dot, a specific element or a carboxylic acid can be detected from the light wavelength conversion particles. Since a ligand composed of a sulfur-based compound, a phosphorus-based compound, a nitrogen-based compound, a carboxyl group-containing compound, etc. is bonded to the surface of the shell of the quantum dot, a specific element or a carboxylic acid can be detected from the light wavelength conversion particles. Even in such a case, the detected specific element or carboxylic acid is not necessarily the specific element or carboxylic acid contained in the resin particles. On the other hand, the ligand of the quantum dot is bonded to the surface of the shell, and since the size of the coordination site of the ligand is usually within about 1 nm, it does not exist at a position more than 3 nm away from the surface of the shell. Therefore, at any position on the surface or inside of the resin particles more than 3 nm away from the surface of the shell of the quantum dot, if a specific element is detected by X-ray photoelectron spectroscopy (XPS) or energy-dispersive X-ray spectroscopy (EDS), or if a carboxylic acid is detected by microscopic infrared spectroscopy (IR), it can be determined that the resin particles contain a specific element or carboxylic acid. The resin particles 41B and 46B are particles of a cured product of a mixture containing at least one of a specific element and a carboxylic acid and a polymerizable compound. The specific element is one or more elements selected from the group consisting of sulfur, phosphorus, and nitrogen. When incorporating a specific element, it is preferable to use a specific compound. Examples of the specific compound include sulfur-based compounds, phosphorus-based compounds, nitrogen-based compounds, or mixtures thereof. Even in such a case, the detected specific element or carboxylic acid is not necessarily the specific element or carboxylic acid contained in the resin particles. On the other hand, the ligand of the quantum dot is bonded to the surface of the shell, and since the size of the coordination site of the ligand is usually within about 1 nm, it does not exist at a position more than 3 nm away from the surface of the shell. Therefore, at any position on the surface or inside of the resin particles more than 3 nm away from the surface of the shell of the quantum dot, if a specific element is detected by X-ray photoelectron spectroscopy (XPS) or energy-dispersive X-ray spectroscopy (EDS), or if a carboxylic acid is detected by microscopic infrared spectroscopy (IR), it can be determined that the resin particles contain a specific element or carboxylic acid. Even in such a case, the detected specific element or carboxylic acid is not necessarily the specific element or carboxylic acid contained in the resin particles. On the other hand, the ligand of the quantum dot is bonded to the surface of the shell, and since the size of the coordination site of the ligand is usually within about 1 nm, it does not exist at a position more than 3 nm away from the surface of the shell. Therefore, at any position on the surface or inside of the resin particles more than 3 nm away from the surface of the shell of the quantum dot, if a specific element is detected by X-ray photoelectron spectroscopy (XPS) or energy-dispersive X-ray spectroscopy (EDS), or if a carboxylic acid is detected by microscopic infrared spectroscopy (IR), it can be determined that the resin particles contain a specific element or carboxylic acid. Even in such a case, the detected specific element or carboxylic acid is not necessarily the specific element or carboxylic acid contained in the resin particles. On the other hand, the ligand of the quantum dot is bonded to the surface of the shell, and since the size of the coordination site of the ligand is usually within about 1 nm, it does not exist at a position more than 3 nm away from the surface of the shell. Therefore, at any position on the surface or inside of the resin particles more than 3 nm away from the surface of the shell of the quantum dot, if a specific element is detected by X-ray photoelectron spectroscopy (XPS) or energy-dispersive X-ray spectroscopy (EDS), or if a carboxylic acid is detected by microscopic infrared spectroscopy (IR), it can be determined that the resin particles contain a specific element or carboxylic acid. Even in such a case, the detected specific element or carboxylic acid is not necessarily the specific element or carboxylic acid contained in the resin particles. On the other hand, the ligand of the quantum dot is bonded to the surface of the shell, and since the size of the coordination site of the ligand is usually within about 1 nm, it does not exist at a position more than 3 nm away from the surface of the shell. Therefore, at any position on the surface or inside of the resin particles more than 3 nm away from the surface of the shell of the quantum dot, if a specific element is detected by X-ray photoelectron spectroscopy (XPS) or energy-dispersive X-ray spectroscopy (EDS), or if a carboxylic acid is detected by microscopic infrared spectroscopy (IR), it can be determined that the resin particles contain a specific element or carboxylic acid. Even in such a case, the detected specific element or carboxylic acid is not necessarily the specific element or carboxylic acid contained in the resin particles. On the other hand, the ligand of the quantum dot is bonded to the surface of the shell, and since the size of the coordination site of the ligand is usually within about 1 nm, it does not exist at a position more than 3 nm away from the surface of the shell. Therefore, at any position on the surface or inside of the resin particles more than 3 nm away from the surface of the shell of the quantum dot, if a specific element is detected by X-ray photoelectron spectroscopy (XPS) or energy-dispersive X-ray spectroscopy (EDS), or if a carboxylic acid is detected by microscopic infrared spectroscopy (IR), it can be determined that the resin particles contain a specific element or carboxylic acid. Even in such a case, the detected specific element or carboxylic acid is not necessarily the specific element or carboxylic acid contained in the resin particles. On the other hand, the ligand of the quantum dot is bonded to the surface of the shell, and since the size of the coordination site of the ligand is usually within about 1 nm, it does not exist at a position more than 3 nm away from the surface of the shell. Therefore, at any position on the surface or inside of the resin particles more than 3 nm away from the surface of the shell of the quantum dot, if a specific element is detected by X-ray photoelectron spectroscopy (XPS) or energy-dispersive X-ray spectroscopy (EDS), or if a carboxylic acid is detected by microscopic infrared spectroscopy (IR), it can be determined that the resin particles contain a specific element or carboxylic acid.

[0049] The resin particles 41B and 46B are particles of a cured product of a mixture containing at least one of a specific element and a carboxylic acid and a polymerizable compound. The specific element is one or more elements selected from the group consisting of sulfur, phosphorus, and nitrogen. When incorporating a specific element, it is preferable to use a specific compound. Examples of the specific compound include sulfur-based compounds, phosphorus-based compounds, nitrogen-based compounds, or mixtures thereof. The resin particles 41B and 46B are particles of a cured product of a mixture containing at least one of a specific element and a carboxylic acid and a polymerizable compound. The specific element is one or more elements selected from the group consisting of sulfur, phosphorus, and nitrogen. When incorporating a specific element, it is preferable to use a specific compound. Examples of the specific compound include sulfur-based compounds, phosphorus-based compounds, nitrogen-based compounds, or mixtures thereof. The resin particles 41B and 46B are particles of a cured product of a mixture containing at least one of a specific element and a carboxylic acid and a polymerizable compound. The specific element is one or more elements selected from the group consisting of sulfur, phosphorus, and nitrogen. When incorporating a specific element, it is preferable to use a specific compound. Examples of the specific compound include sulfur-based compounds, phosphorus-based compounds, nitrogen-based compounds, or mixtures thereof. The resin particles 41B and 46B are particles of a cured product of a mixture containing at least one of a specific element and a carboxylic acid and a polymerizable compound. The specific element is one or more elements selected from the group consisting of sulfur, phosphorus, and nitrogen. When incorporating a specific element, it is preferable to use a specific compound. Examples of the specific compound include sulfur-based compounds, phosphorus-based compounds, nitrogen-based compounds, or mixtures thereof. The resin particles 41B and 46B are particles of a cured product of a mixture containing at least one of a specific element and a carboxylic acid and a polymerizable compound. The specific element is one or more elements selected from the group consisting of sulfur, phosphorus, and nitrogen. When incorporating a specific element, it is preferable to use a specific compound. Examples of the specific compound include sulfur-based compounds, phosphorus-based compounds, nitrogen-based compounds, or mixtures thereof.

[0050] (Sulfur-based compounds) Sulfur-based compounds are compounds containing sulfur. Sulfur-based compounds are not particularly limited, but examples include thiol compounds, thioether compounds, disulfide compounds, thiophene compounds, and the like. When a thiol compound is used as the sulfur compound, in the resin particles, it is preferable that the thiol compound and the polymerizable compound form a copolymer by a thiol-ene reaction. By copolymerizing the thiol and the polymerizable compound, the thiol compound is Sulfur-based compounds are compounds containing sulfur. Sulfur-based compounds are not particularly limited, but examples include thiol compounds, thioether compounds, disulfide compounds, thiophene compounds, and the like. When a thiol compound is used as the sulfur compound, in the resin particles, it is preferable that the thiol compound and the polymerizable compound form a copolymer by a thiol-ene reaction. By copolymerizing the thiol and the polymerizable compound, the thiol compound is Sulfur-based compounds are compounds containing sulfur. Sulfur-based compounds are not particularly limited, but examples include thiol compounds, thioether compounds, disulfide compounds, thiophene compounds, and the like. When a thiol compound is used as the sulfur compound, in the resin particles, it is preferable that the thiol compound and the polymerizable compound form a copolymer by a thiol-ene reaction. By copolymerizing the thiol and the polymerizable compound, the thiol compound is Sulfur-based compounds are compounds containing sulfur. Sulfur-based compounds are not particularly limited, but examples include thiol compounds, thioether compounds, disulfide compounds, thiophene compounds, and the like. When a thiol compound is used as the sulfur compound, in the resin particles, it is preferable that the thiol compound and the polymerizable compound form a copolymer by a thiol-ene reaction. By copolymerizing the thiol and the polymerizable compound, the thiol compound is Sulfur-based compounds are compounds containing sulfur. Sulfur-based compounds are not particularly limited, but examples include thiol compounds, thioether compounds, disulfide compounds, thiophene compounds, and the like. When a thiol compound is used as the sulfur compound, in the resin particles, it is preferable that the thiol compound and the polymerizable compound form a copolymer by a thiol-ene reaction. By copolymerizing the thiol and the polymerizable compound, the thiol compound is It can be fixed in the resin particles. In this embodiment, the thiol compound and the polymerizable compound are separate compounds, but a thiol compound having a thiol group and a radically polymerizable functional group in one molecule may also be used. When using a thiol compound, from the viewpoints of pot life during coating and odor suppression, it is particularly preferable to use a secondary thiol compound or a tertiary thiol compound. A secondary thiol compound refers to a compound in which two hydrocarbon groups are bonded to the carbon to which the thiol group is bonded. A tertiary thiol compound refers to a compound in which three hydrocarbon groups are bonded to the carbon to which the thiol group is bonded. In the secondary thiol compound and the tertiary thiol compound, it is sufficient that there is one or more thiol groups in one molecule, but from the viewpoints of heat resistance and improvement of heat and humidity resistance of the quantum dots, it is preferably two or more. When using a thiol compound, from the viewpoints of pot life during coating and odor suppression, it is particularly preferable to use a secondary thiol compound or a tertiary thiol compound. A secondary thiol compound refers to a compound in which two hydrocarbon groups are bonded to the carbon to which the thiol group is bonded. A tertiary thiol compound refers to a compound in which three hydrocarbon groups are bonded to the carbon to which the thiol group is bonded. In the secondary thiol compound and the tertiary thiol compound, it is sufficient that there is one or more thiol groups in one molecule, but from the viewpoints of heat resistance and improvement of heat and humidity resistance of the quantum dots, it is preferably two or more. preferred.

[0051] A secondary thiol compound refers to a compound in which two hydrocarbon groups are bonded to the carbon to which the thiol group is bonded. A tertiary thiol compound refers to a compound in which three hydrocarbon groups are bonded to the carbon to which the thiol group is bonded. In the secondary thiol compound and the tertiary thiol compound, it is sufficient that there is one or more thiol groups in one molecule, but from the viewpoints of heat resistance and improvement of heat and humidity resistance of the quantum dots, it is preferably two or more. A tertiary thiol compound refers to a compound in which three hydrocarbon groups are bonded to the carbon to which the thiol group is bonded. In the secondary thiol compound and the tertiary thiol compound, it is sufficient that there is one or more thiol groups in one molecule, but from the viewpoints of heat resistance and improvement of heat and humidity resistance of the quantum dots, it is preferably two or more. A secondary thiol compound and a tertiary thiol compound are not particularly limited, but from the viewpoints of curability during the formation of the light wavelength conversion layer and improvement of heat resistance and heat and humidity resistance of the quantum dots, the compound represented by the following general formula (1) is preferred. In the formula, R is an optionally substituted alkyl group having 1 to 10 carbon atoms, R is an optionally substituted alkylene group having 1 to 10 carbon atoms, R is an n-valent aliphatic group having 1 to 15 carbon atoms which may contain atoms other than carbon atoms, m is an integer of 1 to 20, and n is an integer of 1 to 30. preferably two or more.

[0052] The secondary thiol compound or the tertiary thiol compound is not particularly limited, but from the viewpoints of curability during the formation of the light wavelength conversion layer and improvement of heat resistance and heat and humidity resistance of the quantum dots, the compound represented by the following general formula (1) is preferred. A secondary thiol compound and a tertiary thiol compound are not particularly limited, but from the viewpoints of curability during the formation of the light wavelength conversion layer and improvement of heat resistance and heat and humidity resistance of the quantum dots, the compound represented by the following general formula (1) is preferred. preferred.

Chemical formula

[0053] R 1The alkyl group may be linear or branched. R 1 Examples of the alkyl group of R include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, isobutyl group, tert-butyl group, n-pentyl group, neopentyl group, tert- pentyl group, isopentyl group, 2-methylbutyl group, 1-ethylpropyl group, hexyl group , isohexyl group, 4-methylpentyl group, 3-methylpentyl group, 2-methylpentyl group, 1-methylpentyl group, 3,3-dimethylbutyl group, 2,2-dimethylbutyl group, 1 ,1-dimethylbutyl group, 1,2-dimethylbutyl group, 1,3-dimethylbutyl group, 2, 3-dimethylbutyl group, 1-ethylbutyl group, 2-ethylbutyl group, heptyl group, octyl group, nonyl group, decyl group, and the like.

[0054] R 2 The alkylene group of R may be either linear or branched. R 2 Examples of the alk ylene group of R include methylene group, ethylene group, trimethylene group, propylene group, isopropi lidene group, and the like.

[0055] R 1 When the alkyl group of R or the alkylene group of R 2 is substituted, examples of the substituent include halo gen atom, hydroxyl group, alkoxy group, aryloxy group, acyl group, alkoxycarbonyl group, carboxyl group, and phenyl group, etc. Examples of the halogen atom include fluorine atom, chlorine atom, and bromine atom.

[0056] R 1 In the alkyl group of R or one methylene group or non-adjacent 2 in the alkylene group of R Two or more methylene groups are -O-, -S-, -SO2-, -CO-, -COO-, -OCO -, -NR 4 -,-CONR 4 -, -NR 4 CO-, -N=CH- and -CH=CH- wherein R 4 Haso Each independently represents hydrogen or an alkyl group having 1 to 5 carbon atoms.

[0057] R 3 Examples of atoms other than carbon atoms that may be contained in the aliphatic group include a nitrogen atom, an acid atom, and the like. Examples of the atom include an atomic atom and a sulfur atom.

[0058] Among these, the curability when forming the light wavelength conversion particles, the heat resistance of the quantum dots, and the humidity and heat resistance are From the perspective of improving 1 is an optionally substituted alkyl group having 1 to 5 carbon atoms, R 2 is an optionally substituted alkylene group having 1 to 5 carbon atoms, and R 3 is the number of carbon atoms A secondary thiol compound having an aliphatic group of 1 to 10, m being 1 to 10, and n being 1 to 15. The R 2 One methylene group or two or more non-adjacent alkylene groups in the alkylene group The methylene groups above may also be substituted with the same groups as above.

[0059] A specific example of a secondary thiol compound is 1,4-bis(3-mercaptobutyryloxy) ) butane, 1,3,5-tris(3-mercaptobutyloxyethyl)-1,3,5-tris(3-mercaptobutyloxyethyl) Triazine-2,4,6(1H,3H,5H)-trione, Pentaerythritol tetrakis Tris(3-mercaptobutyrate), Trimethylolpropane tris(3-mercaptobutyrate) Examples include trimethylol ethane tris(3-mercaptobutyrate) and the like. Specific examples of the tertiary thiol compound include tert-butyl mercaptan and the like.

[0060] (Phosphorus-based compound) The phosphorus-based compound is a compound containing phosphorus. The phosphorus-based compound is not particularly limited. However, phosphonic acid-based compounds, phosphinic acid-based compounds, phosphine oxide-based compounds, phosphorous acid-based compounds, phosphorous acid-based compounds, and phosphine-based compounds are included. Among these, from the viewpoints of curability during the formation of the light wavelength conversion particles, heat resistance of the quantum dots, and improvement of moisture and heat resistance, the compound represented by the following general formula (2) is preferable. [Chemical formula] In the formula, q is an integer of 0 or 1, and R 5 ~R 7 are each independently hydrogen, a hydroxyl group , a linear or branched alkyl group having 1 to 30 carbon atoms which may be substituted, a linear or branched alkoxy group having 1 to 30 carbon atoms which may be substituted, a linear or branched alkenyl group having 1 to 30 carbon atoms which may be substituted, a linear or branched alkynyl group having 1 to 30 carbon atoms which may be substituted, a cycloalkyl group having 3 to 6 carbon atoms which may be substituted, , a phenyl group which may be substituted, a biphenyl group which may be substituted, a naphthyl group which may be substituted, a phenoxy group which may be substituted, or a complex ring group which may be substituted, or a hydroxyl group. , a cycloalkyl group having 3 to 6 carbon atoms which may be substituted, , a phenyl group which may be substituted, a biphenyl group which may be substituted, a naphthyl group which may be substituted, a phenoxy group which may be substituted, or a complex ring group which may be substituted, or a hydroxyl group. When any of R

[0061] R 5 ~R 7 has a substituent, examples of the substituent include a halogen atom (F , Cl, Br), an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, 1 to 6 alkenyl group, an alkynyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, ( (meth)acryloyl group, (meth)acryloyloxy group, amino group, hydroxyl group, carboxy l group, an alkylamino group having 1 to 6 carbon atoms, nitro group, phenyl group, biphenyl group, naphthi l group, phenoxy group, or a heterocyclic group, etc. may be mentioned.

[0062] Examples of the heterocyclic group include a pyridyl group, pyrimidinyl group, pyridazinyl group, pyrazyl group, furyl group, thienyl group, oxazolyl group, isoxazolyl group, oxadiazolyl group, thiazolyl group, isothiazolyl group, imidazolyl group, triazolyl group, pyrrole group, pyrazolyl group, or tetrazolyl group.

[0063] Specific examples of the phosphorus compound include tris(2-ethylhexyl) phosphite, tril uryl phosphite, tris(tridecyl) phosphite, bis(decyl) pentaeryth ritol diphosphite, bis(tridecyl) pentaerythritol diphosphite, t riphenyl phosphite, tris(nonylphenyl) phosphite, butyl acid phosph ate, oleyl acid phosphate, tetracosyl acid phosphate, 2-hydroxy ethyl methacrylate acid phosphate, dibutyl phosphate, dimethyl vinyl phosphate, di-2-ethylhexyl hydrogen phosphite, dioleyl hydro gen phosphite, etc.

[0064] (Nitrogen-based compound) The nitrogen-based compound is a compound containing nitrogen. The nitrogen-based compound is not particularly limited From the viewpoints of curability during the formation of light wavelength conversion particles, heat resistance, and improvement of heat and moisture resistance of quantum dots an amine compound is preferable. As the amine compound, any of a primary amine compound, a secondary amine compound, a tertiary amine compound, and a diamine compound may be used.

[0065] Specific examples of the amine compound include laurylamine, myristylamine, cetylamine , stearylamine, oleylamine, behenylamine, distearylamine, dimethyllaurylamine, dimethylmyristylamine, dimethylstearylamine, dilaurylmonomethylamine, trioctylamine, oleylpropylenediamine, and the like.

[0066] (Carboxylic acid) Carboxylic acid is a compound containing at least one carboxyl group. The carboxylic acid may contain two or more carboxyl groups and may also contain a polymerizable functional group.

[0067] From the viewpoints that the weight average molecular weight of the carboxylic acid is hardly volatile, has excellent dispersibility, and is easy to handle , it is preferably 150 or more and 50,000 or less. In this specification, the "weight average molecular weight" is obtained by dissolving in a solvent such as tetrahydrofuran (THF) and performing polystyrene conversion by a conventionally known gel permeation chromatography (GPC) method. The lower limit of the weight average molecular weight of the carboxylic acid is more preferably 300 or more , and the upper limit is more preferably 10,000 or less.

[0068] The carboxyl group equivalent (weight average molecular weight / carboxyl group number) of the carboxylic acid is 150 or more and 50,000 or less from the viewpoint of making it easy to have carboxylic acid around the quantum dots . ​​It is preferable. The lower limit of the carboxyl group equivalent of the carboxylic acid is 300 or more, and it is more preferably 10,000 or less.

[0069] Specific examples of the carboxylic acid include ω-carboxy-polycaprolactone mono(meth) acrylate, phthalic acid monohydroxyethyl (meth)acrylate, 2-acryloyl oxyethyl succinic acid, the reaction product of pentaerythritol and acrylic acid and the reaction product of succinic anhydride, 3-butenoic acid, 10-undecenoic acid, n-octanoic acid, stearic acid, adipic acid , dodecanic acid, 4,4'-dicarboxydiphenyl ether, octadecanedioic acid, etc. are mentioned. Among these, from the viewpoints of fixing the carboxylic acid in the resin constituting the resin particles 41B and 46B and making it easy for the carboxylic acid to exist around the quantum dots, ω-carboxy -polycaprolactone mono(meth)acrylate and 2-acryloyloxyethyl succinic acid are preferable.

[0070] (Polymerizable compound) The polymerizable compound (curable compound) is a polymerizable compound, and examples thereof include ionizing radiation polymerizable compounds (ionizing radiation curable compounds) and thermopolymerizable compounds (thermosetting compounds). The ionizing radiation in this specification includes visible light, as well as ultraviolet rays, X-rays, electron beams, α-rays , β-rays, and γ-rays.

[0071] The ionizing radiation polymerizable compound has at least one ionizing radiation polymerizable functional group in the molecule. Examples of the ionizing radiation polymerizable functional group include ethylenically unsaturated groups such as (meth)acryloyl group, vinyl group, allyl group, etc. Note that the "(meth)acryloyl group" The term "」 means including both "acryloyl group" and "methacryloyl group".

[0072] As the ionizing radiation-polymerizable compound, an ionizing radiation-polymerizable monomer, an ionizing radiation-polymerizable oligo mer, or an ionizing radiation-polymerizable prepolymer can be mentioned, and these can be appropriately adjusted and used as needed. As the ionizing radiation-polymerizable compound, a combination of an ionizing radiation-polymerizable monomer and an ionizing radiation-polymerizable oligomer or an ionizing radiation-polymerizable prepolymer is preferable.

[0073] Examples of the ionizing radiation-polymerizable monomer include monomers containing a hydroxyl group such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, etc., and ethylene glycol di(meth)acrylate, di ethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, tetramethylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimeth rol ethane tri(meth)acrylate, pentaerythritol di(meth)acrylate , pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth )acrylate, dipentaerythritol tetra(meth)acrylate, dipentaeryth ritol hexa(meth)acrylate, glycerol (meth)acrylate, etc. (meth) acrylate esters can be mentioned.

[0074] As the ionizing radiation-polymerizable oligomer, a polyfunctional oligomer having two or more functional groups is preferable, and the ele A polyfunctional oligomer having three or more (3-functional) radiation-polymerizable functional groups is more preferred. The above poly functional oligomers include, for example, polyester (meth)acrylate, urethane (meth )acrylate, polyester-urethane (meth)acrylate, polyether (meth) acrylate, polyol (meth)acrylate, melamine (meth)acrylate, is ocyanurate (meth)acrylate, epoxy (meth)acrylate and the like.

[0075] The radiation-polymerizable prepolymer has a weight-average molecular weight exceeding 10,000, and the weight-average molecular weight is preferably 10,000 or more and 80,000 or less, and more preferably 10,000 or more and 40,000 or less. When the weight-average molecular weight exceeds 80,000, the coating applicability deteriorates due to high viscosity, and the appearance of the obtained light wavelength conversion member may deteriorate. Therefore, when using a radiation-polymerizable prepolymer having a weight-average molecular weight exceeding 80,000, it is preferable to mix and use the above polymerizable monomer and the above polymerizable oligomer. Examples of the polyfunctional polymerizable prepolymer include ure thane (meth)acrylate, isocyanurate (meth)acrylate, polyester- urethane (meth)acrylate, epoxy (meth)acrylate and the like.

[0076] The thermopolymerizable compound has at least one thermopolymerizable functional group in the molecule. Examples of the thermopolymerizable functional group include cyclic ether groups such as epoxy groups and oxetanyl groups, vinyl ether groups and the like.

[0077] The epoxy compound is a compound having one or more epoxy groups in the molecule. The epoxy compound is not particularly limited, and examples include bisphenol A type epoxy compounds, bis Phenol F-type epoxy compound, bisphenol S-type epoxy compound, biphenyl-type epoxy compound, fluorene-type epoxy compound, novolak phenol-type epoxy compound, cresol novolak-type epoxy compound, modified products thereof, etc., aromatic series, or ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether or 1, ,6-hexanediol diglycidyl ether, etc., alkylene glycol diglycidyl ether, glycerin or its di- or triglycidyl ether of polyhydric alcohol such as alkylene oxide adduct, polyethylene glycol or its diglycidyl ether of alkylene oxide adduct, polypropylene glycol or its diglycidyl ether of alkylene oxide adduct, etc., polyalkylene glycol diglycidyl ether, and aliphatic series such as alkylene oxide are exemplified. Here, as the alkylene oxide, aliphatic epoxy compounds such as ethylene oxide and propylene oxide, 3’,4’-epoxycyclohexyl methyl 3,4-epoxycyclohexanecarboxylate, 3,4-epoxycyclohexylmethyl methacrylate and other alicyclic epoxy compounds containing one or more epoxy groups and one or more ester groups in the molecule are exemplified.

[0078] <Coating layer> The coating layers 41C and 46C cover the surfaces of the resin particles 41B and 46B. The coating layers 41C and 46C are preferably coating layers in that they can easily cover the entire surfaces of the resin particles 41B and 46B. The function of the coating layer 41 is not particularly , the coating layers 41C and 46C have at least one of the functions of maintaining the shape of resin particles, preventing the components in the resin particles from dissolving out of the particles, preventing the components in the dispersion liquid or composition from penetrating into the resin particles, imparting barrier properties against oxygen and water vapor, preventing the reflection of excitation light incident on the resin particles, and imparting resin particle dispersibility when used as a dispersion liquid or composition. The film thickness of the coating layers 41C and 46C depends on the functions exhibited by the coating layers 41C and 46C, but from the viewpoints of ease of manufacture and making the resin particles of appropriate size, it is preferably 10 nm or more and 5000 nm or less, and more preferably 20 nm or more and 1000 nm or less. In particular, when the coating layers 41C and 46C exhibit the barrier property-imparting function, from the viewpoint of preventing cracks and the like in the coating layer while maintaining the barrier property, the film thickness of the coating layers 41C and 46C is more preferably 50 nm or more and 1000 nm or less. Further, when the coating layers 41C and 46C exhibit the antireflection function and the refractive index satisfies the relationship of binder resin < coating layer < resin particles or binder resin > coating layer > resin particles described later, from the viewpoint of suppressing reflection on the surface of the light wavelength conversion particles 41 and 46 and efficiently taking in the excitation light into the resin particles 41B and 46B, the film thickness of the coating layers 41C and 46C is more preferably 50 nm or more and 300 nm or less. The film thickness of the coating layers 41C and 46C is measured by using a scanning electron microscope (SEM) to photograph the cross section of the light wavelength conversion particles 41 and 46, measuring the film thickness at 20 locations in the cross-sectional image of the cross section, and taking the average value of the film thicknesses at the 20 locations. Depending on the function of the coating layers 41C and 46C, although the coating layers 41C and 46C maintain the shape of the resin particles,

[0079]

[0080] ​​​​​​​​​​​​​​​When having functions, the coating layers 41C and 46C can be formed, for example, using a composition for a coating layer containing a polymerizable compound. Since the polymerizable compound is the same as the polymerizable compound used for forming the resin particles 41B and 46B, the description thereof is omitted here. Among these, from the viewpoint of improving the adhesion between the resin particles and the coating layer, for example, when forming the resin particles from an ionizing radiation polymerizable compound, it is preferable to form using a composition for a coating layer containing an ionizing radiation polymerizable compound, and when forming the resin particles from a thermally polymerizable compound, it is preferable to form using a composition for a coating layer containing a thermally polymerizable compound.

[0081] When forming a barrier layer that suppresses the permeation of moisture and oxygen as the coating layers 41C and 46C, examples of the constituent material of the barrier layer include inorganic oxides. Specifically, examples of the inorganic oxides include silicon oxide (SiO x n m x y z ) such as silica, aluminum oxide (Al

[0082] From the viewpoint of improving the adhesion with the binder resins 42 and 47, the barrier layer is a silane coupling ​​​​​​​​​​​​​​​​​It is preferably surface-modified with a sizing agent. As the silane coupling agent, although it depends on the type of the polymerizable compound that becomes the binder resin 16 after curing, it has one or more reactive functional groups selected from the group consisting of a vinyl group, an epoxy group, a styryl group, a methacryl group, an acrylic group, an amino group, a ureido group, a mercapto group, a sulfide group, and an isocyanate group. It is possible to use one having the above. When a compound having a (meth)acryloyl group is used as the polymerizable compound, the coupling agent preferably has at least one reactive functional group selected from the group consisting of a mercapto group, a (meth)acryloyl group, a vinyl group, and a styryl group. Further, when a compound having at least one group selected from the group consisting of an epoxy group, an isocyanate group, and a carboxyl group is used as the polymerizable compound, the silane coupling agent preferably has at least one reactive functional group selected from the group consisting of an epoxy group, an isocyanate group, a mercapto group, and an amino group. It depends on the type of the polymerizable compound that becomes the binder resin 16 after curing. A vinyl group, an epoxy group, a styryl group, a methacryl group, an acrylic group, an amino group, a ureido group, a mercapto group, a sulfide group And an isocyanate group, and it is possible to use one having one or more reactive functional groups selected from the group consisting of them. When a compound having a (meth)acryloyl group is used as the polymerizable compound, The coupling agent has at least one reactive functional group selected from the group consisting of a mercapto group, a (meth)acryloyl group, a vinyl group, and a styryl group. It is preferably. Also, when a compound having at least one group selected from the group consisting of an epoxy group, an isocyanate group, and a carboxyl group is used as the polymerizable compound, The silane coupling agent preferably has at least one reactive functional group selected from the group consisting of an epoxy group, an isocyanate group, a mercapto group, and an amino group. When used, the silane coupling agent preferably has at least one reactive functional group selected from the group consisting of an epoxy group, an isocyanate group, a mercapto group, and an amino group. When the surface of the light wavelength conversion particle is the surface of the resin particle, in the light wavelength conversion layer composition, the light wavelength conversion particles tend to aggregate, so there is a risk of poor dispersibility. However, when the surface of the light wavelength conversion particle is the surface of the barrier layer, in the light wavelength conversion layer composition, the light wavelength conversion particles are less likely to aggregate, so the dispersibility can be improved. It is preferably.

[0083] When the surface of the light wavelength conversion particle is the surface of the resin particle, in the light wavelength conversion layer composition, the light wavelength conversion particles tend to aggregate, so there is a risk of poor dispersibility. However, when the surface of the light wavelength conversion particle is the surface of the barrier layer, in the light wavelength conversion layer composition, the light wavelength conversion particles are less likely to aggregate, so the dispersibility can be improved. So there is a risk of poor dispersibility. However, when the surface of the light wavelength conversion particle is the surface of the barrier layer, in the light wavelength conversion layer composition, the light wavelength conversion particles are less likely to aggregate, so the dispersibility can be improved. When the surface of the light wavelength conversion particle is the surface of the barrier layer, in the light wavelength conversion layer composition, the light wavelength conversion particles are less likely to aggregate, so the dispersibility can be improved. So the dispersibility can be improved.

[0084] The light wavelength conversion particles 41 and 46 can be produced, for example, by the following method. First, cure a light wavelength conversion particle composition containing at least one of a quantum dot, the above specific compound, and a carboxylic acid, and the above polymerizable compound to obtain a cured product of the light wavelength conversion particle composition. First, at least one of a quantum dot, the above specific compound, and a carboxylic acid, and the above polymerizable compound, and cure the light wavelength conversion particle composition containing them. To obtain a cured product of the light wavelength conversion particle composition. A cured product is obtained. Then, this cured product is pulverized, for example, by a bead mill. As a result, light wavelength conversion particles having a surface that is the surface of the resin particles can be obtained. The light wavelength conversion particle composition preferably contains a polymerization initiator. The light wavelength conversion particles provided with a coating layer can be obtained by forming a coating layer on the surface of the resin particles.

[0085] The light wavelength conversion particles 41 and 46 can also be produced by the following method. First, quantum dots, at least any one of the above specific compounds and carboxylic acids, and a polymerizable compound are dispersed in a poor solvent such as water in a granular form. Then, with the light wavelength conversion particle composition dispersed in a granular state, the polymerizable compound in the light wavelength conversion particle composition is polymerized, for example, by suspension polymerization or emulsion polymerization, to obtain light wavelength conversion particles having a surface that is the surface of the resin particles. The "poor solvent" means a solvent in which the light wavelength conversion particle composition hardly dissolves, and examples include polar solvents such as water. The light wavelength conversion particle composition preferably contains a polymerization initiator. Also in this case, the light wavelength conversion particles provided with a coating layer can be obtained by forming a coating layer on the surface of the resin particles in the same manner as above. When forming a barrier layer as the coating layers 41C and 46C on the surfaces of the resin particles 41B and 46B, the barrier layer can be produced using the sol-gel method. Specifically, first, an appropriate amount of a metal alkoxide (1) such as tetraethoxysilane is added to the resin particles and hydrolyzed appropriately to replace the surface of the resin particles with a hydrolyzate of the metal alkoxide (1). This can be achieved.

[0086] When forming a barrier layer as the coating layers 41C and 46C on the surfaces of the resin particles 41B and 46B, the barrier layer can be produced using the sol-gel method. Specifically, first, an appropriate amount of a metal alkoxide (1) such as tetraethoxysilane is added to the resin particles and hydrolyzed appropriately to replace the surface of the resin particles with a hydrolyzate of the metal alkoxide (1). By hydrolyzing appropriately, the surface of the resin particles is replaced with a hydrolyzate of the metal alkoxide (1). Do so. Such a liquid is used as the organic solvent A. On the other hand, in the aqueous solution, for example, a metal alkoxide (2) such as 3-mercaptopropyltrimethoxysilane is dispersed and partially hydrolyzed to obtain an aqueous solution B. Here, the metal alkoxide (2) is selected to have a slower hydrolysis rate than the metal alkoxide (1). Then, the organic solution A and the aqueous solution B are mixed so that a layer of the metal alkoxide (2) is further formed on the surface of the resin particles covered with the metal alkoxide (1). The resin particles precipitate in the aqueous phase. Since the metal alkoxide (2 ) near the surface has a slower hydrolysis rate than the metal alkoxide (1), when it precipitates in the aqueous phase, it prevents the alkoxides on the surface of the resin particles from dehydrating and condensing all at once to form large lumps. An inorganic oxide layer such as a silica glass layer is further deposited on the resin particles in the aqueous phase. This can be done by hydrolyzing a small amount of the metal alkoxide (3) in an alkaline region with a large amount of water and alcohol by the normal spin bar method and depositing it on the nuclear resin particles. Thereby, a barium layer can be formed.

[0087] <<Binder Resin>> The binder resins 42 and 47 are not particularly limited, but since they are the same as the binder resin of the light-shielding layer 30, the description thereof is omitted here.

[0088] <<Light-Scattering Particles>> The light-scattering particles are particles having an action of changing the traveling direction of light by scattering the light that has entered the light wavelength conversion layer.

[0089] The average particle diameter of the light-scattering particles is preferably 20 times or more and 2000 times or less, and more preferably 50 times or more and 1000 times or less, the average particle diameter of the quantum dots. The light-scattering particles ​​​​​​​​​​​ If the average particle diameter of the particles is 20 times or more the average particle diameter of the quantum dots, in the light wavelength conversion layer sufficient light scattering performance can be obtained. If the average particle diameter of the light scattering particles is 2000 times or less the average particle diameter of the quantum dots, compared to the case exceeding 2000 times, when the addition amount is the same, the number of light scattering particles increases, so the number of scattering points increases, and a sufficient light scattering effect can be obtained. The average particle diameter of the light scattering particles can be measured in the same way as the average particle diameter of the quantum dots described above. Note that the average particle diameter of the light scattering particles can be measured in the same way as the average particle diameter of the quantum dots described above. It can be measured.

[0090] In addition, the average particle diameter of the light scattering particles is preferably 1 / 300 or more and 1 / 2 0 or less of the average film thickness of the light wavelength conversion layer, and more preferably 1 / 200 or more and 1 / 30 or less. If the average particle diameter of the light scattering particles is 1 / 300 or more of the average film thickness of the light wavelength conversion layer, sufficient light scattering performance can be obtained in the light wavelength conversion layer. If the average particle diameter of the light scattering particles is 1 / 20 or less of the average film thickness of the light wavelength conversion layer, compared to the case exceeding 1 / 20, when the addition amount is the same the ratio of the light scattering particles to the light wavelength conversion layer increases, so the number of scattering points is large, and a sufficient light scattering effect can be obtained.

[0091] Specifically, the average particle diameter of the light scattering particles is preferably, for example, 0.1 μm or more and 10 μm or less and more preferably 0.3 μm or more and 5 μm or less. If the average particle diameter of the light scattering particles is 0.1 μm or more, the light wavelength conversion efficiency of the light wavelength conversion member becomes sufficient . On the other hand, if the average particle diameter of the light scattering particles is 10 μm or less, compared to the case where the average particle diameter of the light scattering particles exceeds 10 μm, when the addition amount (mass%) is the same, the number of light scattering particles increases so the number of scattering points increases, and a sufficient light scattering effect can be obtained. Therefore, the number of scattering points increases, and a sufficient light scattering effect can be obtained.

[0092] The shape of the light-scattering particles is not particularly limited. For example, spherical (true spherical, substantially true spherical, ellipsoidal, etc. ), polyhedral, rod-shaped (cylindrical, prismatic, etc.), plate-shaped, flaky, irregular-shaped, etc. may be mentioned. . When the shape of the light-scattering particles is not spherical, the particle diameter of the light-scattering particles can be set to the value of a true sphere having the same volume.

[0093] From the viewpoint of firmly fixing the light-scattering particles in the binder resin, the light-scattering particles are preferably surface-treated with a silane coupling agent. By being surface-treated with a silane coupling agent, it can be chemically bonded to the binder resin described later.

[0094] As the silane coupling agent, depending on the type of the polymerizable compound to be used, one or more reactive functional groups selected from the group consisting of a vinyl group, an epoxy group, a styryl group, a methacryl group, an acrylic group, an amino group, a ureido group, a thiol group , a sulfide group, and an isocyanate group can be used. When a compound having a (meth)acryloyl group is used as the polymerizable compound, the coupling agent preferably has at least one reactive functional group selected from the group consisting of a thiol group, a (meth)acryloyl group, a vinyl group, and a styryl group. Also, when a compound having at least one group selected from the group consisting of an epoxy group, an isocyanate group, and a hydroxyl group is used as the polymerizable compound, the silane coupling agent preferably has at least one reactive functional group selected from the group consisting of an epoxy group, an isocyanate group, a thiol group, and an amino group.

[0095] The light-scattering particles may be organic particles such as acrylic resin particles, styrene resin particles, melamine resin particles, and urethane resin particles, etc. However, the change rate of luminance before and after the heat resistance test can be made small, and the incident light on the light wavelength conversion layer can be preferably scattered, and the improvement of the light wavelength conversion efficiency with respect to this incident light can be preferably achieved. Therefore, inorganic particles are preferred. The inorganic particles are preferably at least one compound selected from the group consisting of aluminum-containing compounds such as Al2O3, zirconium-containing compounds such as ZrO2, tin-containing compounds such as antimony-doped tin oxide (ATO) and indium tin oxide (ITO), magnesium-containing compounds such as MgO and MgF2, titanium-containing compounds such as TiO2 and BaTiO3, antimony-containing compounds such as Sb2O5, silicon-containing compounds such as SiO2, and zinc-containing compounds such as ZnO. These inorganic particles can increase the refractive index difference with the binder resin, so they are also preferred from the viewpoint of obtaining a large Mie scattering intensity. Since the improvement of the light wavelength conversion efficiency with respect to the incident light by the light wavelength conversion layer can be more preferably achieved, the light-scattering particles may be composed of two or more materials. The light diffusion layer 50 has a function of diffusing the light from the light-emitting element 23. When an LED element is used as the light-emitting element, since the LED element has strong directivity, the light diffusion layer 50 is arranged to diffuse the light from the LED element. The light diffusion layer 50 contains light-scattering particles and a binder resin. Preferred.

[0096] The inorganic particles may be organic particles such as acrylic resin particles, styrene resin particles, melamine resin particles, and urethane resin particles, etc. However, the change rate of luminance before and after the heat resistance test can be made small, and the incident light on the light wavelength conversion layer can be preferably scattered, and the improvement of the light wavelength conversion efficiency with respect to this incident light can be preferably achieved. Therefore, inorganic particles are preferred. The inorganic particles are preferably at least one compound selected from the group consisting of aluminum-containing compounds such as Al2O3, zirconium-containing compounds such as ZrO2, tin-containing compounds such as antimony-doped tin oxide (ATO) and indium tin oxide (ITO), magnesium-containing compounds such as MgO and MgF2, titanium-containing compounds such as TiO2 and BaTiO3, antimony-containing compounds such as Sb2O5, silicon-containing compounds such as SiO2, and zinc-containing compounds such as ZnO. These inorganic particles can increase the refractive index difference with the binder resin, so they are also preferred from the viewpoint of obtaining a large Mie scattering intensity. Since the improvement of the light wavelength conversion efficiency with respect to the incident light by the light wavelength conversion layer can be more preferably achieved, the light-scattering particles may be composed of two or more materials. The light diffusion layer 50 has a function of diffusing the light from the light-emitting element 23. When an LED element is used as the light-emitting element, since the LED element has strong directivity, the light diffusion layer 50 is arranged to diffuse the light from the LED element. The light diffusion layer 50 contains light-scattering particles and a binder resin. The inorganic particles are preferably at least one compound selected from the group consisting of aluminum-containing compounds such as Al2O3, zirconium-containing compounds such as ZrO2, tin-containing compounds such as antimony-doped tin oxide (ATO) and indium tin oxide (ITO), magnesium-containing compounds such as MgO and MgF2, titanium-containing compounds such as TiO2 and BaTiO3, antimony-containing compounds such as Sb2O5, silicon-containing compounds such as SiO2, and zinc-containing compounds such as ZnO. These inorganic particles can increase the refractive index difference with the binder resin, so they are also preferred from the viewpoint of obtaining a large Mie scattering intensity. Since the improvement of the light wavelength conversion efficiency with respect to the incident light by the light wavelength conversion layer can be more preferably achieved, the light-scattering particles may be composed of two or more materials. The inorganic particles are preferably at least one compound selected from the group consisting of aluminum-containing compounds such as Al2O3, zirconium-containing compounds such as ZrO2, tin-containing compounds such as antimony-doped tin oxide (ATO) and indium tin oxide (ITO), magnesium-containing compounds such as MgO and MgF2, titanium-containing compounds such as TiO2 and BaTiO3, antimony-containing compounds such as Sb2O5, silicon-containing compounds such as SiO2, and zinc-containing compounds such as ZnO. These inorganic particles can increase the refractive index difference with the binder resin, so they are also preferred from the viewpoint of obtaining a large Mie scattering intensity. Since the improvement of the light wavelength conversion efficiency with respect to the incident light by the light wavelength conversion layer can be more preferably achieved, the light-scattering particles may be composed of two or more materials. The inorganic particles are preferably at least one compound selected from the group consisting of aluminum-containing compounds such as Al2O3, zirconium-containing compounds such as ZrO2, tin-containing compounds such as antimony-doped tin oxide (ATO) and indium tin oxide (ITO), magnesium-containing compounds such as MgO and MgF2, titanium-containing compounds such as TiO2 and BaTiO3, antimony-containing compounds such as Sb2O5, silicon-containing compounds such as SiO2, and zinc-containing compounds such as ZnO. These inorganic particles can increase the refractive index difference with the binder resin, so they are also preferred from the viewpoint of obtaining a large Mie scattering intensity. Since the improvement of the light wavelength conversion efficiency with respect to the incident light by the light wavelength conversion layer can be more preferably achieved, the light-scattering particles may be composed of two or more materials. The inorganic particles are preferably at least one compound selected from the group consisting of aluminum-containing compounds such as Al2O3, zirconium-containing compounds such as ZrO2, tin-containing compounds such as antimony-doped tin oxide (ATO) and indium tin oxide (ITO), magnesium-containing compounds such as MgO and MgF2, titanium-containing compounds such as TiO2 and BaTiO3, antimony-containing compounds such as Sb2O5, silicon-containing compounds such as SiO2, and zinc-containing compounds such as ZnO. These inorganic particles can increase the refractive index difference with the binder resin, so they are also preferred from the viewpoint of obtaining a large Mie scattering intensity. Since the improvement of the light wavelength conversion efficiency with respect to the incident light by the light wavelength conversion layer can be more preferably achieved, the light-scattering particles may be composed of two or more materials. The inorganic particles are preferably at least one compound selected from the group consisting of aluminum-containing compounds such as Al2O3, zirconium-containing compounds such as ZrO2, tin-containing compounds such as antimony-doped tin oxide (ATO) and indium tin oxide (ITO), magnesium-containing compounds such as MgO and MgF2, titanium-containing compounds such as TiO2 and BaTiO3, antimony-containing compounds such as Sb2O5, silicon-containing compounds such as SiO2, and zinc-containing compounds such as ZnO. These inorganic particles can increase the refractive index difference with the binder resin, so they are also preferred from the viewpoint of obtaining a large Mie scattering intensity. Since the improvement of the light wavelength conversion efficiency with respect to the incident light by the light wavelength conversion layer can be more preferably achieved, the light-scattering particles may be composed of two or more materials.

[0097] <<Light Diffusion Layer>> The light diffusion layer 50 has a function of diffusing the light from the light-emitting element 23. When an LED element is used as the light-emitting element, since the LED element has strong directivity, the light diffusion layer 50 is arranged to diffuse the light from the LED element. When an LED element is used as the light-emitting element, since the LED element has strong directivity, the light diffusion layer 50 is arranged to diffuse the light from the LED element. For this reason, the light diffusion layer 50 is arranged.

[0098] The light diffusion layer 50 contains light-scattering particles and a binder resin. The resin is the same as the light-scattering particles and binder resin 42, 47 described in the column of the light wavelength conversion layers 40 and 45, and thus the description thereof will be omitted here. , which is the same as 47, so the description thereof will be omitted here.

[0099] The film thickness of the light diffusion layer 50 is not particularly limited, but is preferably 0.5 μm or more and 50 μm or less. If the film thickness of the light diffusion layer 50 is 0.5 μm or more, sufficient light diffusion performance can be obtained, and if it is 50 μm or less, it is suitable for thinning the image display device. The lower limit of the film thickness of the light diffusion layer 5 0 is more preferably 2 μm, and the upper limit is more preferably 20 μm or less. The film thickness of the light diffusion layer 50 can be measured in the same manner as the film thickness of the light shielding layer 30. The lower limit of the film thickness of 0 is more preferably 2 μm, and the upper limit is more preferably 20 μm or less. The film thickness of the light diffusion layer 50 can be measured in the same manner as the film thickness of the light shielding layer 30. The film thickness of the light diffusion layer 50 can be measured in the same manner as the film thickness of the light shielding layer 30. is possible.

[0100] <<Coloring layer>> The coloring layers 60 and 65 have a function of transmitting the light wavelength-converted by the quantum dots 41A and 46A and absorbing the light from the light-emitting element 23. In the present embodiment, since the quantum dot 41A converts blue light into green light, the coloring layer 60 is a green coloring layer that transmits the green light wavelength-converted by the quantum dot 4 1A and absorbs the blue light from the light-emitting element 23. Further, since the quantum dot 46A converts blue light into red light in the present embodiment, the coloring layer 65 is a red coloring layer that transmits the red light wavelength-converted by the quantum dot 46A and absorbs the blue light from the light-emitting element 23. in the present embodiment, the coloring layer 65 is a red coloring layer that transmits the red light wavelength-converted by the quantum dot 46A and absorbs the blue light from the light-emitting element 23. in the present embodiment, the coloring layer 65 is a red coloring layer that transmits the red light wavelength-converted by the quantum dot 46A and absorbs the blue light from the light-emitting element 23. There is.

[0101] The coloring layer 70 has a function of transmitting light in a predetermined wavelength range including the light diffused by the light diffusion layer 50 and absorbing light in other wavelength ranges. In the present embodiment, since the light diffused by the light diffusion layer 5 0 is blue light, the coloring layer 70 transmits blue light and is blue 0 is blue light, the coloring layer 70 transmits blue light and is blue It is a blue coloring layer that absorbs light other than light.

[0102] The coloring layers 60, 65, and 70 contain a colorant and a binder resin. The coloring layers 60, 65 , 70 can have a film thickness similar to that of a general coloring layer in a color filter , for example, it may be 1 μm or more and 5 μm or less.

[0103] <Colorant> The colorant is not particularly limited, and examples thereof include pigments and dyes of each color. Green As the green colorant used in the green coloring layer, for example, phthalocyanine-based pigments such as halogen polysubstituted phthalocyanine pigments or halogen polysubstituted copper phthalocyanine-based pigments, triphenyl methane-based basic dyes, isoindoline-based pigments, isoindolinone-based pigments, etc. can be mentioned. As the red colorant used in the red coloring layer, for example, perylene-based pigments, lake pigments, azo -based pigments, quinacridone-based pigments, anthraquinone-based pigments, anthracene-based pigments, isoind oline-based pigments, etc. can be mentioned. As the blue colorant used in the blue coloring layer, for example, copper phtha locyanine-based pigments, anthraquinone-based pigments, indanthrene-based pigments, indophenol-based pigments, cyanine-based pigments, dioxazine-based pigments, etc. can be mentioned. These pigments and dyes can be used alone or in combination of two or more.

[0104] <Binder resin> As the binder resin, the same binder resin as that described in the section of the light shielding layer 30 can be used , so here, the description will be omitted.

[0105] <<Barrier member>> The barrier member 80 suppresses the permeation of moisture and oxygen, and the quantum dots 41A, 46A from moisture and It is a member for protecting from oxygen. Here, the "barrier member" in this specification refers to a member alone, with a water vapor transmission rate of less than 0.1 g / (m 2 ·24 h) at 40 °C and a relative humidity of 90%, and an oxygen transmission rate of less than 0.1 cm 3 / (m 2 ·24 h· atm) at 23 °C and a relative humidity of 90%. The barrier member includes not only members with a single-layer structure but also members with a multi-layer structure. By installing the barrier member in a state of sandwiching the light wavelength conversion layer, the deterioration of quantum dots can be suppressed.

[0106] The water vapor transmission rate (WVTR: Water Vapor Transmission Rate) of the barrier member 80 is preferably 1.0 × 10 g / (m -2 ·24 h) or less under the conditions of 40 °C 2 and a relative humidity of 90%. The above water vapor transmission rate can be measured using a water vapor transmission rate measuring device (product name "PE RMATRAN-W3 / 31", manufactured by MOCON). The water vapor transmission rate is the arithmetic mean value of the values obtained by measuring three times. RMATRAN-W3 / 31", manufactured by MOCON). The water vapor transmission rate is the arithmetic mean value of the values obtained by measuring three times. The water vapor transmission rate is the arithmetic mean value of the values obtained by measuring three times.

[0107] The oxygen transmission rate (OTR: Oxygen Transmission Rate) of the barrier member 80 is preferably 1.0 × 10 cm -2 / (m 3 ·24 h·atm) or less under the conditions of 23 °C 2 and a relative humidity of 90%. The above oxygen transmission rate can be measured using an oxygen gas transmission rate measuring device (product name " OX-TRAN 2 / 21", manufactured by MOCON). The oxygen transmission rate is the arithmetic mean value of the values obtained by measuring three times. OX-TRAN 2 / 21", manufactured by MOCON). The oxygen transmission rate is the arithmetic mean value of the values obtained by measuring three times. The oxygen transmission rate is the arithmetic mean value of the values obtained by measuring three times.

[0108] The barrier member 80 shown in FIG. 1 is made of glass. The barrier member 80 may be composed of a light-transmissive substrate having no barrier property and a barrier layer provided on the light wavelength conversion layer side of the light-transmissive substrate and having a function of suppressing the transmission of moisture and oxygen. The barrier layer is composed of a vapor deposition layer having a function of suppressing the transmission of moisture and oxygen. The vapor deposition layer is, for example, a layer formed by a physical vapor deposition (PVD) method such as a sputtering method or an ion plating method or a vapor deposition method such as a chemical vapor deposition (CVD) method. The vapor deposition layer has the advantage of being able to enhance the barrier property. The barrier layer is composed of a vapor deposition layer having a function of suppressing the transmission of moisture and oxygen. The vapor deposition layer is, for example, a layer formed by a physical vapor deposition (PVD) method such as a sputtering method or an ion plating method or a vapor deposition method such as a chemical vapor deposition (CVD) method. The vapor deposition layer has the advantage of being able to enhance the barrier property.

[0109] The barrier layer is composed of a vapor deposition layer having a function of suppressing the transmission of moisture and oxygen. The vapor deposition layer is, for example, a layer formed by a physical vapor deposition (PVD) method such as a sputtering method or an ion plating method or a vapor deposition method such as a chemical vapor deposition (CVD) method. The vapor deposition layer has the advantage of being able to enhance the barrier property. The vapor deposition layer is not particularly limited as long as it can be vapor-deposited by a vapor deposition method and has a barrier property. For example, inorganic oxides such as silicon oxide and aluminum oxide and metals can be mentioned. The vapor deposition layer is not particularly limited as long as it can be vapor-deposited by a vapor deposition method and has a barrier property. For example, inorganic oxides such as silicon oxide and aluminum oxide and metals can be mentioned. The vapor deposition layer is not particularly limited as long as it can be vapor-deposited by a vapor deposition method and has a barrier property. For example, inorganic oxides such as silicon oxide and aluminum oxide and metals can be mentioned.

[0110] The vapor deposition layer is not particularly limited as long as it can be vapor-deposited by a vapor deposition method and has a barrier property. For example, inorganic oxides such as silicon oxide and aluminum oxide and metals can be mentioned. The vapor deposition layer is not particularly limited as long as it can be vapor-deposited by a vapor deposition method and has a barrier property. For example, inorganic oxides such as silicon oxide and aluminum oxide and metals can be mentioned. The vapor deposition layer is not particularly limited as long as it can be vapor-deposited by a vapor deposition method and has a barrier property. For example, inorganic oxides such as silicon oxide and aluminum oxide and metals can be mentioned.

[0111] The film thickness of the vapor deposition layer is not particularly limited, but it is preferably 0.01 μm or more and 1 μm or less. If the film thickness of the vapor deposition layer is 0.01 μm or more, the barrier performance of the vapor deposition layer is sufficient, and if it is 1 μm or less, cracks and the like in the vapor deposition layer are less likely to occur. The lower limit of the film thickness of the vapor deposition layer is more preferably 0.03 μm or more, and the upper limit is more preferably 0.5 μm or less. The film thickness of the vapor deposition layer can be measured in the same manner as the film thickness of the light-shielding layer. The film thickness of the vapor deposition layer is not particularly limited, but it is preferably 0.01 μm or more and 1 μm or less. If the film thickness of the vapor deposition layer is 0.01 μm or more, the barrier performance of the vapor deposition layer is sufficient, and if it is 1 μm or less, cracks and the like in the vapor deposition layer are less likely to occur. The lower limit of the film thickness of the vapor deposition layer is more preferably 0.03 μm or more, and the upper limit is more preferably 0.5 μm or less. The film thickness of the vapor deposition layer can be measured in the same manner as the film thickness of the light-shielding layer. The film thickness of the vapor deposition layer is not particularly limited, but it is preferably 0.01 μm or more and 1 μm or less. If the film thickness of the vapor deposition layer is 0.01 μm or more, the barrier performance of the vapor deposition layer is sufficient, and if it is 1 μm or less, cracks and the like in the vapor deposition layer are less likely to occur. The lower limit of the film thickness of the vapor deposition layer is more preferably 0.03 μm or more, and the upper limit is more preferably 0.5 μm or less. The film thickness of the vapor deposition layer can be measured in the same manner as the film thickness of the light-shielding layer. The film thickness of the vapor deposition layer is not particularly limited, but it is preferably 0.01 μm or more and 1 μm or less. If the film thickness of the vapor deposition layer is 0.01 μm or more, the barrier performance of the vapor deposition layer is sufficient, and if it is 1 μm or less, cracks and the like in the vapor deposition layer are less likely to occur. The lower limit of the film thickness of the vapor deposition layer is more preferably 0.03 μm or more, and the upper limit is more preferably 0.5 μm or less. The film thickness of the vapor deposition layer can be measured in the same manner as the film thickness of the light-shielding layer. The film thickness of the vapor deposition layer is not particularly limited, but it is preferably 0.01 μm or more and 1 μm or less. If the film thickness of the vapor deposition layer is 0.01 μm or more, the barrier performance of the vapor deposition layer is sufficient, and if it is 1 μm or less, cracks and the like in the vapor deposition layer are less likely to occur. The lower limit of the film thickness of the vapor deposition layer is more preferably 0.03 μm or more, and the upper limit is more preferably 0.5 μm or less. The film thickness of the vapor deposition layer can be measured in the same manner as the film thickness of the light-shielding layer.

[0112] <<Circular Polarizing Plate>> The circular polarizing plate 90 has a function of suppressing external light reflection. Specifically, when external light enters the image display device 10, the green light contained in the external light passes through the coloring layer 60, and the red light contained in the external light The circular polarizing plate 90 has a function of suppressing external light reflection. Specifically, when external light enters the image display device 10, the green light contained in the external light passes through the coloring layer 60, and the red light contained in the external light Since the colored light passes through the colored layer 65 and the blue light contained in the external light passes through the colored layer 70, there is a possibility that it is reflected by the package 24 and emitted outside the image display device 10. However, by providing the circular polarizing plate 90 on the observer side rather than the colored layers 60, 65, 70, the external light reflected by the package 24 is absorbed by the circular polarizing plate 90.

[0113] <<<<Other image display devices>>>> In the image display device 10 shown in FIG. 1, the light wavelength conversion particles 41, 46 are used However, instead of the light wavelength conversion particles 41, 46, or together with the light wavelength conversion particles 41, 46, water Light-transmissive barrier particles that suppress the transmission of moisture and oxygen, and quantum dots encapsulated in the barrier particles Light wavelength conversion particles may be used.

[0114] In the image display device 100 shown in FIG. 3, instead of the light wavelength conversion layers 40, 45, Light wavelength conversion layers 110, 115 are used. Among the members shown in FIG. 3 and subsequent drawings, Those with the same reference numerals as the members shown in FIG. 1 are the same as the members shown in FIG. 1 So the description will be omitted.

[0115] <<<Light wavelength conversion layer>>> The light wavelength conversion layers 110, 115 have the function of converting the wavelength of the incident light into other wavelengths. In the present embodiment, the light wavelength conversion layer 110 has the function of converting blue light into green light And the light wavelength conversion layer 115 has the function of converting blue light into red light. The light wavelength conversion layer 110 includes the light wavelength conversion particles 111 and the binder resin 42, and the light wavelength conversion layer 1 115 includes the light wavelength conversion particles 112 and the binder resin 47. The light wavelength conversion layer 11 ​1115 may contain light-scattering particles in addition to the light wavelength conversion particles 111 and 116 and the binder resins 42 and 47.

[0116] <<Light wavelength conversion particles>> The light wavelength conversion particles 111 and 116 are also particles that convert the wavelength of incident light into other wavelengths. As shown in FIGS. 4(A) and 4(B), the light wavelength conversion particles 111 and 116 include light-transmissive barrier particles 111A and 116A that suppress the transmission of water and oxygen, and quantum dots 41A and 46A encapsulated in the barrier particles 111A and 116A. There is no air layer between the quantum dots 41A and 46A and the barrier particles 111A and 116A, and the surfaces of the quantum dots 41A and 46A are in close contact with the barrier particles 111A and 116A. There is no air layer between the quantum dots 41A, 46A and the barrier particles 111A, 116A, and the surfaces of the quantum dots 41A, 46A are in close contact with the barrier particles 111A, 116A. The light wavelength conversion particles 111 and 116 preferably contain one or more and 50 or less quantum dots 41A

[0117] and 46A per particle, more preferably one or more and 40 or less or one or more and 3 and 5 or less quantum dots 41A and 46A per particle. If the number of quantum dots contained in one light wavelength conversion particle is less than 1, the luminance may decrease, and if the number of quantum dots contained in one light wavelength conversion particle exceeds 50, the luminous efficiency may decrease due to concentration quenching causing quenching due to energy transfer between quantum dots. The number of quantum dots contained in one light wavelength conversion particle is preferably one or more and 50 or less, more preferably one or more and 40 or less or one or more and 3 and 5 or less. If the number of quantum dots contained in one light wavelength conversion particle is less than 1, the luminance may decrease, and if the number of quantum dots contained in one light wavelength conversion particle exceeds 50, the luminous efficiency may decrease due to concentration quenching caused by energy transfer between quantum dots. The number of quantum dots contained in one light wavelength conversion particle is preferably one or more and 50 or less, more preferably one or more and 40 or less or one or more and 3 and 5 or less. If the number of quantum dots contained in one light wavelength conversion particle is less than 1, the luminance may decrease, and if the number of quantum dots contained in one light wavelength conversion particle exceeds 50, the luminous efficiency may decrease due to concentration quenching caused by energy transfer between quantum dots. The number of quantum dots contained in one light wavelength conversion particle is preferably one or more and 50 or less, more preferably one or more and 40 or less or one or more and 3 and 5 or less. If the number of quantum dots contained in one light wavelength conversion particle is less than 1, the luminance may decrease, and if the number of quantum dots contained in one light wavelength conversion particle exceeds 50, the luminous efficiency may decrease due to concentration quenching caused by energy transfer between quantum dots. The number of quantum dots contained in one light wavelength conversion particle is preferably one or more and 50 or less, more preferably one or more and 40 or less or one or more and 3 and 5 or less. If the number of quantum dots contained in one light wavelength conversion particle is less than 1, the luminance may decrease, and if the number of quantum dots contained in one light wavelength conversion particle exceeds 50, the luminous efficiency may decrease due to concentration quenching caused by energy transfer between quantum dots. The number of quantum dots contained in one light wavelength conversion particle is calculated by randomly photographing the cross-sections of 20 light wavelength conversion particles at a magnification of 100,000 to 500,000 times using a transmission electron microscope (TEM) or a scanning transmission electron microscope (STEM), calculating the number of quantum dots contained in one light wavelength conversion particle from the obtained cross-sectional images, and calculating the average value of the calculated number of quantum dots. The number of quantum dots contained in one light wavelength conversion particle is calculated by randomly photographing the cross-sections of 20 light wavelength conversion particles at a magnification of 100,000 to 500,000 times using a transmission electron microscope (TEM) or a scanning transmission electron microscope (STEM), calculating the number of quantum dots contained in one light wavelength conversion particle from the obtained cross-sectional images, and calculating the average value of the calculated number of quantum dots. It can be obtained by doing so.

[0118] The average particle diameters of the light wavelength conversion particles 111 and 116 are 10 nm or more and 500 nm or less, which is preferable. If the average particle diameter of the light wavelength conversion particles is 10 nm or more, sufficient barrier properties can be imparted to the quantum dots. If it is 500 nm or less, although the reason is not clear, there is no possibility that the barrier properties of the barrier particles become unstable. The average particle diameter of the light wavelength conversion particles can be obtained by measuring the particle diameters of 20 light wavelength conversion particles in the cross-sectional observation of the light wavelength conversion sheet by a transmission electron microscope or a scanning transmission electron microscope and calculating the average value. The lower limit of the average particle diameter of the light wavelength conversion particles 111 and 116 is 20 nm or more, which is preferable. The upper limit of the average particle diameter of the light wavelength conversion particles 111 and 116 is preferably 200 nm or less, more preferably 100 nm or less.

[0119] <Barrier particles> The barrier particles 111A and 116A contain the quantum dots 41A and 46A, have light transmittance, and have barrier properties that suppress the transmission of moisture and oxygen. By encapsulating the quantum dots 41 A and 46A with the barrier particles 111A and 116A, contact between the quantum dots 41A and 46 A with moisture and oxygen can be suppressed. Therefore, deterioration of the quantum dots 41A and 46A due to moisture and acid can be suppressed. Thereby, a decrease in the light emission efficiency of the quantum dots 41 A and 46A can be suppressed without providing a barrier layer. In this specification, "light transmittance" means having the property of transmitting light, and "light transmittance" includes transparency. In the present invention, since the quantum dots are encapsulated in the barrier particles, the light emitted from the light wavelength conversion sheet If the light emission from the quantum dots can be confirmed, it can be said that the barrier particles have light transmissivity. The light emission of the quantum dots can be confirmed using a fluorometer.

[0120] The materials for forming the barrier particles 111A and 116A are not particularly limited as long as they have light transmissivity and can provide barrier properties. Examples include inorganic oxides. Specifically, as the inorganic oxides, for example, silicon oxide (SiO such as silica), aluminum oxide (Al x such as alumina), titanium oxide (TiO2), yttrium oxide, boron oxide (B2O3), calcium oxide (CaO), silicon carbonitride oxide (SiO n O m ), etc. are included. Among these, silica or alumina such as glass is preferred from the viewpoint of low permeability to oxygen and water vapor. These materials may be used alone or in combination of two or more. It is also possible to use inorganic oxides excluding oxide semiconductors. x N y C z ) etc. are mentioned. Among these, silica or alumina such as glass is preferred from the viewpoint of low permeability to oxygen and water vapor. These materials may be used alone or in combination of two or more. It is also possible to use inorganic oxides excluding oxide semiconductors. These materials may be used alone or in combination of two or more. It is also possible to use inorganic oxides excluding oxide semiconductors. When the quantum dots 41A and 46A contain Cd, in order to prevent the elution of Cd contained in the quantum dots 41A and 46A, the thickness of the barrier particles 111A and 116A (the distance from the surface of the quantum dots to the outer surface of the barrier particles) is preferably 2 nm or more, and more preferably 4 nm or more. When the average particle diameter of the light wavelength conversion particles 41 and 46 is about 50 nm, the thickness of the barrier particles 111A and 116A can also be 10 nm or more.

[0121] When the quantum dots 41A and 46A contain Cd, in order to prevent the elution of Cd contained in the quantum dots 41A and 46A, the thickness of the barrier particles 111A and 116A (the distance from the surface of the quantum dots to the outer surface of the barrier particles) is preferably 2 nm or more, and more preferably 4 nm or more. When the average particle diameter of the light wavelength conversion particles 41 and 46 is about 50 nm, the thickness of the barrier particles 111A and 116A can also be 10 nm or more. When the average particle diameter of the light wavelength conversion particles 41 and 46 is about 50 nm, the thickness of the barrier particles 111A and 116A can also be 10 nm or more. When the average particle diameter of the light wavelength conversion particles 41 and 46 is about 50 nm, the thickness of the barrier particles 111A and 116A can also be 10 nm or more. When the average particle diameter of the light wavelength conversion particles 41 and 46 is about 50 nm, the thickness of the barrier particles 111A and 116A can also be 10 nm or more. When the average particle diameter of the light wavelength conversion particles 41 and 46 is about 50 nm, the thickness of the barrier particles 111A and 116A can also be 10 nm or more. The thickness of the α particles 111A and 116A can also be 20 nm or more. The thickness of the barrier particles can be easily measured as the outer part that does not contain quantum dots in transmission electron microscope observations. When the thickness varies depending on the position of the periphery of the barrier particles, the average of the entire periphery of the barrier particles is taken as the thickness

[0122] of the barrier particles. The barrier particles 111A and 116A are preferably chemically bonded to the binder resins 42 and 47 from the viewpoint of improving the adhesion to the binder resins 42 and 47. This chemical bond can be achieved by the barrier particles 111A and 116A surface-modified with a silane coupling agent.

[0123] The silane coupling agent depends on the type of the curable binder resin precursor to be used, but it is possible to use one having at least one reactive functional group selected from the group consisting of vinyl group, epoxy group, styryl group, methacryl group, acryl group, amino group, ureido group, mercapto group, sulfide group, and isocyanate group. When using a compound having a (meth)acryloyl group as the curable binder resin precursor, the coupling agent preferably has at least one reactive functional group selected from the group consisting of mercapto group, (meth)acryloyl group, vinyl group, and styryl group. Also, when using a compound having at least one group selected from the group consisting of epoxy group, isocyanate group, and hydroxyl group as the curable binder resin precursor, the silane coupling agent preferably has at least one reactive functional group selected from the group consisting of epoxy group, isocyanate group, mercapto group, and amino group.

[0124] As a method for surface-treating the barrier particles 111A and 116A with a silane coupling agent, a dry method of spraying the silane coupling agent onto the barrier particles 111A and 116A, or a wet method in which the barrier particles 111A and 116A are dispersed in a solvent and then the silane coupling agent is added and reacted can be mentioned.

[0125] The light wavelength conversion particles 111 and 116 can be produced, for example, by using the sol-gel method (see Japanese Patent No. 5682069). Specifically, first, quantum dots are prepared, and an appropriate amount of a metal alkoxide (1) such as tetraethoxysilane is added to the quantum dots and moderately hydrolyzed to replace the surface of the quantum dots with the hydrolysis product of the metal alkoxide (1). Let such a liquid be the organic solvent A. On the other hand, a metal alkoxide (2) such as 3-mercaptopropyltrimethoxysilane is dispersed in an aqueous solution and partially hydrolyzed to obtain an aqueous solution B. Here, a metal alkoxide (2) having a slower hydrolysis rate than the metal alkoxide (1) is selected. Then, the organic solution A and the aqueous solution B are mixed so that a layer of the metal alkoxide (2 ) is formed on the surface of the quantum dots covered with the metal alkoxide (1). The quantum dots that come into contact with water become hydrophilic due to the progress of the hydrolysis of the metal alkoxide on their surface and move to the aqueous phase. At this time, the quantum dots aggregate with each other. The metal alkoxide (2) near the surface has a slower hydrolysis rate than the metal alkoxide (1), so when moving to the aqueous phase, the alkoxide on the surface of the quantum dots does not undergo dehydration condensation all at once and is prevented from becoming a large lump. An inorganic oxide layer such as a silica glass layer is further deposited on the aggregate in the aqueous phase . This is carried out by the ordinary Stoeber method in an alkaline region with a small amount of metal The metal alkoxide (2) near the surface has a slower hydrolysis rate than the metal alkoxide (1), so when moving to the aqueous phase, the alkoxide on the surface of the quantum dots does not undergo dehydration condensation all at once and is prevented from becoming a large lump. An inorganic oxide layer such as a silica glass layer is further deposited on the aggregate in the aqueous phase . This is carried out by the ordinary Stoeber method in an alkaline region with a small amount of metal oxide. The alkoxide (3) can be hydrolyzed with a large amount of water and alcohol and deposited on the set of quantum dots serving as nuclei. Thereby, the light wavelength conversion particles 111 and 116 can be obtained.

[0126] <<<<Other image display devices>>>> In the image display devices 10 and 100, the deterioration of the quantum dots 41A and 46A can be suppressed. Since the quantum dots 41A and 46A are encapsulated by the resin particles 41B and 46B and the barrier particles 111A and 116A, a barrier layer is not formed between the light emitting element 24 and the light wavelength conversion layers 40 and 45. However, when the quantum dots are not encapsulated by the resin particles or the barrier particles, it is preferable to form a barrier layer between the light emitting element and the light wavelength conversion layer.

[0127] In the image display device 120 shown in FIG. 5, barrier layers 140 and 145 are formed between the light emitting element 23 and the light wavelength conversion layers 130 and 135.

[0128] <<Light wavelength conversion layer>> The light wavelength conversion layers 130 and 135 shown in FIG. 5 contain the quantum dots 41A and 46A and the binder resins 42 and 47, but the quantum dots 41A and 46A are not encapsulated by the resin particles or the barrier particles.

[0129] <<Barrier layer>> The barrier layers 140 and 145 have a function of suppressing the permeation of moisture and oxygen, and are the same as the barrier layers described in the column of the barrier member 80, so the description thereof is omitted here.

[0130] <<<Manufacturing method of image display device>>> The image display device 10 can be manufactured, for example, as follows. First, the barrier​​​​​​​​ Apply the light-shielding layer composition on one surface side of the member 80 and dry it to form a coating film of the light-shielding layer composition thereof.

[0131] After forming the coating film, expose it so that openings are formed, develop it, and perform heat treatment to form a light-shielding layer 30 having openings 30 A, 30B, and 30C.

[0132] Next, using each color layer composition, in the same manner as the light-shielding layer 30, within the openings 3 0A, 30B, and 30C of the light-shielding layer 30, form color layers 60, 65, and 70. After forming the color layers 60, 65, and 70, using the light-diffusing layer composition, in the same manner as the light-shielding layer 30, form a light-diffusing layer 50 within the opening 30 C.

[0133] After forming the light-diffusing layer 50, using the light wavelength conversion layer composition, in the same manner as the light-shielding layer 30 form light wavelength conversion layers 40 and 45 within the openings 30A and 30B.

[0134] The viscosity of the light wavelength conversion layer composition is preferably 10 mPa·s or more and 10000 mPa·s or less. If the viscosity of the light wavelength conversion layer composition is less than 10 mPa·s, it may be difficult to form a sufficient film thickness. Also, if it exceeds 10000 mPa·s, it may be difficult to apply the light wavelength conversion layer composition, and there is a risk that the leveling property will deteriorate . The lower limit of the viscosity of the light wavelength conversion layer composition is preferably 10 mPa·s or more, and the upper limit of the viscosity of the light wavelength conversion layer composition is preferably 10000 mPa·s or less. The content of quantum dots with respect to the total solid mass of the light wavelength conversion layer composition is preferably 1 mass% or more and 4

[0135] 0 mass% or less, and more preferably 3 mass% or more and 30 mass% or less. Preferably, it is 3 mass% or more and 30 mass% or less. This is the case. If the content of the quantum dots is 1% by mass or more, sufficient emission intensity can be obtained. Also, if the content of the quantum dots is 40% by mass or less, processing during film formation becomes easier. When the content of the quantum dots is 40% by mass or less, processing during film formation becomes easier.

[0136] The content of the polymerizable compound with respect to the total solid mass of the composition for the light wavelength conversion layer is preferably 30% by mass or more, and preferably 50% by mass or more and 99% by mass or less. When the content of the polymerizable compound is 30% by mass or more, sufficient curability can be obtained when curing the composition for the light wavelength conversion layer. When the content of the polymerizable compound is 30% by mass or more, sufficient curability can be obtained when curing the composition for the light wavelength conversion layer. After forming the light wavelength conversion layers 40 and 45, the light emitting element package 21 having the light emitting element 23 is attached to the light shielding layer 30 and the light wavelength conversion layers 40 and 45 by an adhesive layer such as OCA (Optical Clear Adhesive) so that the light emitting element 23 faces the light wavelength conversion layers 40 and 45. Finally, a circularly polarizing plate 90 is attached to the other surface side of the barrier member 80. Thereby, the image display device 10 shown in FIG. 1 is obtained.

[0137] After forming the light wavelength conversion layers 40 and 45, the light emitting element package 21 having the light emitting element 23 is attached to the light shielding layer 30 and the light wavelength conversion layers 40 and 45 by an adhesive layer such as OCA (Optical Clear Adhesive) so that the light emitting element 23 faces the light wavelength conversion layers 40 and 45. Finally, a circularly polarizing plate 90 is attached to the other surface side of the barrier member 80. Thereby, the image display device 10 shown in FIG. 1 is obtained. After forming the light wavelength conversion layers 40 and 45, the light emitting element package 21 having the light emitting element 23 is attached to the light shielding layer 30 and the light wavelength conversion layers 40 and 45 by an adhesive layer such as OCA (Optical Clear Adhesive) so that the light emitting element 23 faces the light wavelength conversion layers 40 and 45. Finally, a circularly polarizing plate 90 is attached to the other surface side of the barrier member 80. Thereby, the image display device 10 shown in FIG. 1 is obtained. After forming the light wavelength conversion layers 40 and 45, the light emitting element package 21 having the light emitting element 23 is attached to the light shielding layer 30 and the light wavelength conversion layers 40 and 45 by an adhesive layer such as OCA (Optical Clear Adhesive) so that the light emitting element 23 faces the light wavelength conversion layers 40 and 45. Finally, a circularly polarizing plate 90 is attached to the other surface side of the barrier member 80. Thereby, the image display device 10 shown in FIG. 1 is obtained. Finally, a circularly polarizing plate 90 is attached to the other surface side of the barrier member 80. Thereby, the image display device 10 shown in FIG. 1 is obtained. Finally, a circularly polarizing plate 90 is attached to the other surface side of the barrier member 80. Thereby, the image display device 10 shown in FIG. 1 is obtained.

[0138] According to the present embodiment, the light emitting elements 23 are arranged for each sub-pixel, and the light wavelength conversion layers 40 and 45 containing the quantum dots 41A and 46A and the light wavelength conversion layers 110 and 115 are arranged at positions corresponding to the light emitting elements 23. By turning on / off each light emitting element 23, a function similar to the shutter function of the liquid crystal cell can be obtained. Therefore, image display can be performed without using a liquid crystal cell. Thereby, the liquid crystal cell can be omitted, and the image display devices 10 and 100 using the quantum dots 41A and 46A with a simplified structure can be obtained. According to the present embodiment, the light emitting elements 23 are arranged for each sub-pixel, and the light wavelength conversion layers 40 and 45 containing the quantum dots 41A and 46A and the light wavelength conversion layers 110 and 115 are arranged at positions corresponding to the light emitting elements 23. By turning on / off each light emitting element 23, a function similar to the shutter function of the liquid crystal cell can be obtained. Therefore, image display can be performed without using a liquid crystal cell. Thereby, the liquid crystal cell can be omitted, and the image display devices 10 and 100 using the quantum dots 41A and 46A with a simplified structure can be obtained. According to the present embodiment, the light emitting elements 23 are arranged for each sub-pixel, and the light wavelength conversion layers 40 and 45 containing the quantum dots 41A and 46A and the light wavelength conversion layers 110 and 115 are arranged at positions corresponding to the light emitting elements 23. By turning on / off each light emitting element 23, a function similar to the shutter function of the liquid crystal cell can be obtained. Therefore, image display can be performed without using a liquid crystal cell. Thereby, the liquid crystal cell can be omitted, and the image display devices 10 and 100 using the quantum dots 41A and 46A with a simplified structure can be obtained. According to the present embodiment, the light emitting elements 23 are arranged for each sub-pixel, and the light wavelength conversion layers 40 and 45 containing the quantum dots 41A and 46A and the light wavelength conversion layers 110 and 115 are arranged at positions corresponding to the light emitting elements 23. By turning on / off each light emitting element 23, a function similar to the shutter function of the liquid crystal cell can be obtained. Therefore, image display can be performed without using a liquid crystal cell. Thereby, the liquid crystal cell can be omitted, and the image display devices 10 and 100 using the quantum dots 41A and 46A with a simplified structure can be obtained. According to the present embodiment, the light emitting elements 23 are arranged for each sub-pixel, and the light wavelength conversion layers 40 and 45 containing the quantum dots 41A and 46A and the light wavelength conversion layers 110 and 115 are arranged at positions corresponding to the light emitting elements 23. By turning on / off each light emitting element 23, a function similar to the shutter function of the liquid crystal cell can be obtained. Therefore, image display can be performed without using a liquid crystal cell. Thereby, the liquid crystal cell can be omitted, and the image display devices 10 and 100 using the quantum dots 41A and 46A with a simplified structure can be obtained. According to the present embodiment, the light emitting elements 23 are arranged for each sub-pixel, and the light wavelength conversion layers 40 and 45 containing the quantum dots 41A and 46A and the light wavelength conversion layers 110 and 115 are arranged at positions corresponding to the light emitting elements 23. By turning on / off each light emitting element 23, a function similar to the shutter function of the liquid crystal cell can be obtained. Therefore, image display can be performed without using a liquid crystal cell. Thereby, the liquid crystal cell can be omitted, and the image display devices 10 and 100 using the quantum dots 41A and 46A with a simplified structure can be obtained.

[0139] According to the present embodiment, the coloring layers 60 and 65 are arranged on the observer side with respect to the light wavelength conversion layers 40 and 45. Since the coloring layers 60 and 65 are arranged, they transmit the light wavelength-converted by the quantum dots 41A and 43A, while absorbing the light from the light-emitting element 23 that is emitted from the light wavelength-conversion layers 40 and 45 without being wavelength-converted by the quantum dots 41A and 43A. As a result, the image display device 10 can emit light with high color purity. When external light enters the light wavelength-conversion layers 40 and 45, the light wavelength-conversion layers may emit light due to the blue light contained in the external light. However, since the coloring layers 60 and 65 are arranged on the observer side rather than the light wavelength-conversion layers 40 and 45,

[0140] the blue light can be absorbed by the coloring layers 60 and 65. As a result, the light emission due to the external light can be suppressed. It is considered that the quantum dots deteriorate due to moisture and oxygen for the following reasons. First, as described above, ligands composed of sulfur-based compounds, phosphorus-based compounds, etc. are coordinated on the surface of the quantum dots. However, this ligand is likely to desorb by light or heat. When the ligand desorbs from the quantum dots,

[0141] moisture and oxygen are likely to adhere to the quantum dots, so the quantum dots are oxidized and deteriorated. As a result, it is considered that the quantum dots deteriorate. In contrast, in the present embodiment, since the light wavelength-conversion layers 40 and 45 use the light wavelength-conversion particles 41 and 46 in which the quantum dots 41A and 46A are encapsulated in the resin particles 41B and 46B containing at least one element selected from the group consisting of sulfur, phosphorus, and nitrogen and at least one of carboxylic acids, at least one of a sulfur component, a phosphorus component, a nitrogen component, and a carboxylic acid can be present in the vicinity of the quantum dots 41A and 46A. This allows for the presence of at least one of a sulfur component, a phosphorus component, a nitrogen component, and a carboxylic acid in the vicinity of the quantum dots 41A and 46A, thereby preventing the quantum dots from deteriorating. In contrast, in the present embodiment, since the light wavelength-conversion layers 40 and 45 use the light wavelength-conversion particles 41 and 46 in which the quantum dots 41A and 46A are encapsulated in the resin particles 41B and 46B containing at least one element selected from the group consisting of sulfur, phosphorus, and nitrogen and at least one of carboxylic acids, at least one of a sulfur component, a phosphorus component, a nitrogen component, and a carboxylic acid can be present in the vicinity of the quantum dots 41A and 46A. This allows for the presence of at least one of a sulfur component, a phosphorus component, a nitrogen component, and a carboxylic acid in the vicinity of the quantum dots 41A and 46A, thereby preventing the quantum dots from deteriorating. This allows for the presence of at least one of a sulfur component, a phosphorus component, a nitrogen component, and a carboxylic acid in the vicinity of the quantum dots 41A and 46A, thereby This is because the ligands are released from the quantum dots, and the degradation of the ligands 41A and 46A can be suppressed. Even when the resin particles 41B and 46B are separated from each other, the sulfur component, phosphorus component, and nitrogen component present in the resin particles 41B and 46B The component and / or the carboxylic acid have a function to assist the role of the ligand (e.g. For example, it can bind to quantum dots instead of ligands and have the function of substituting the ligand and of absorbing oxygen. This is thought to be because the function of capturing the image is at least one of the following functions. In the optical wavelength conversion layers 110 and 115, the barrier particles 111A and 116A are provided with quantum dots 4. Since the light wavelength conversion particles 111 and 116 containing 1A and 46A are used, the barrier particles 111A and 116A protect the quantum dots 41A and 46A from moisture and oxygen. Therefore, the deterioration of the quantum dots 41A and 46A can be suppressed. In this case, the quantum dots 41 can be formed without covering both sides of the optical wavelength conversion layers 40 and 45 with a barrier material. It can suppress the deterioration of A and 46A.

[0142] As described above, in this embodiment, the resin particles containing the quantum dots 41A and 46A The molecules 41B and 46B are one or more elements selected from the group consisting of sulfur, phosphorus, and nitrogen. and carboxylic acid, so that the present invention does not contain such elements or carboxylic acids. Compared to resin particles, the deterioration of the quantum dots 41A and 46A can be suppressed. In some cases, the surface of the quantum dots is partially exposed on the surface of the resin particles. In the case where the covering layers 41C and 46C are barrier layers that suppress the permeation of moisture and oxygen, In the case where the dots 41A and 46A are partially exposed on the surfaces of the resin particles 41B and 46B, However, the quantum dots 41 are partially exposed from the resin particles 41B and 46B due to the barrier layer. A can suppress the contact between 46A and moisture and oxygen, so the quantum dots 41A and 46 can be further protected from degradation of A.

[0143] [Second Embodiment] Hereinafter, an image display device according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a schematic configuration diagram of the image display device according to this embodiment.

[0144] <<<<Image Display Device>>>> The image display device 150 shown in FIG. 6 includes a light source 20 including one or more light-emitting elements 23, and a light-shielding layer 30 disposed on the observer side of the light-emitting element 23 and having openings 30A, 30 B, 30C corresponding to the positions of the light-emitting elements 23, a light wavelength conversion layer 16 0, 165 disposed in the openings 30A, 30B, a light diffusion layer 50 disposed in the opening 30C, and a coloring layer 60 as a first coloring layer disposed on the observer side of the light wavelength conversion layers 160, 165 in the openings 30A, 30B , 65, a coloring layer 70 disposed on the observer side of the light diffusion layer 50 in the opening 30C, and a coloring layer 170, 175 as a second coloring layer disposed on the light-emitting element 23 side of the light wavelength conversion layers 160, 165 in the openings 30A, 30B. The image display device 150 includes a barrier member 80 and a circular polarizing plate 90 in this order toward the observer side of the coloring layers 60, 70. The image display device 150 also includes a barrier member 180 disposed opposite to the barrier member 90 on the light-emitting element 23 side of the light-shielding layer 30 and the coloring layers 170, 175. The light-shielding layer 30 is in contact with the barrier member 180. The light source 20 is integrated with the barrier member 180 via a light-transmissive adhesive layer 95.

[0145]

[0145] <<Light Wavelength Conversion Layer>> The wavelength conversion layers 160 and 165 shown in FIG. 6 include quantum dots 41A and 46A and binder resins 42 and 47, but the quantum dots 41A and 46A are not encapsulated in resin particles or barrier particles.

[0146] <<Coloring layer>> The coloring layers 170 and 175 have a function of transmitting the light from the light emitting element 23 and absorbing the light wavelength-converted by the quantum dots 41A and 46A. Specifically, since the quantum dot 41A converts blue light into green light, the coloring layer 170 is a blue coloring layer that transmits the blue light from the light emitting element 23 and absorbs the green light wavelength-converted by the quantum dot 41A. Also, since the quantum dot 46A converts blue light into red light, the coloring layer 175 is a blue coloring layer that transmits the blue light from the light emitting element 23 and absorbs the red light wavelength-converted by the quantum dot 46A.

[0147] The coloring layers 170 and 175 include a colorant and a binder resin. Since the colorant and the binder resin of the coloring layers 170 and 175 are the same as those of the coloring layer 70, the description thereof is omitted here.

[0148] <<Barrier member>> Since the barrier member 180 is the same as the barrier member 90, the description thereof is omitted here.

[0149] According to the present embodiment, the light emitting element 23 is arranged for each sub-pixel, and the wavelength conversion layers 160 and 165 including the quantum dots 41A and 46A are arranged at positions corresponding to the light emitting element 23, so that a function similar to the shutter function of the liquid crystal cell is obtained by turning on / off each light emitting element 23. Therefore, image display can be performed without using a liquid crystal cell. As a result, Since the liquid crystal cell can be omitted, an image display device 150 using quantum dots 41A and 46A with a simplified structure can be obtained.

[0150] According to the present embodiment, since the light wavelength conversion layers 160 and 165 are sandwiched by the barrier members 80 and 180, the barrier members 80 and 180 can suppress the deterioration of the quantum dots 41A and 46A due to moisture and oxygen.

[0151] When external light enters the coloring layers 60 and 65, the green light contained in the external light passes through the coloring layer 60, and the red light contained in the external light passes through the coloring layer 65. However, when it further passes through the barrier member 180 and reaches the light source 20 side, it is reflected by the package 24 and becomes stray light, which may enter other sub-pixels. According to the present embodiment, since the coloring layer 170 is disposed on the light emitting element 23 side rather than the light wavelength conversion layer 160, the green light that has passed through the coloring layer 60 can be absorbed by the coloring layer 170. Also, since the coloring layer 175 is disposed on the light emitting element 23 side rather than the light wavelength conversion layer 165, the red light that has passed through the coloring layer 65 can be absorbed by the coloring layer 175. As a result, the generation of stray light can be suppressed.

Example

[0152] In order to explain the present invention in detail, examples will be given below, but the present invention is not limited to these descriptions.

[0153] <Manufacture of Light Wavelength Conversion Particles> Light wavelength conversion particles were obtained according to the following procedure. (Light Wavelength Conversion Particles G1) ​​​​​​​​​​First, tricyclodecane dimethanol diacrylate (product name "A-DCP", manufactured by Shin-Nakamura Chemical Co., Ltd.) 50 parts by mass, tetraethylene glycol bis(3-mercaptopropionate) (product name "EGMP-4", manufactured by SC Organic Chemicals Co., Ltd.) 50 parts by mass, green-emitting quantum dots (product name "CdSe / ZnS 530", manufactured by SIGMA- ALDRICH, core: CdSe, shell: ZnS, average particle diameter 3.3 nm) 1.0 part by mass , and a thermal radical polymerization initiator (2,2'-azobis(2,4-dimethylvaleronitrile , manufactured by Tokyo Chemical Industry Co., Ltd.) 1 part by mass were used to prepare a composition G1 for light wavelength conversion particles. Then, as a poor solvent, 10 parts by mass of polyvinyl alcohol as a dispersant dissolved in 900 parts by mass of ion-exchanged water was added. Then, the mixture was stirred at a stirring speed of 400 rpm for 10 minutes by a stirring device to finely disperse the composition G1 for light wavelength conversion particles as droplets in the poor solvent. Subsequently, the stirring by the stirring device was continued at a stirring speed of 400 rpm, and the temperature of the reaction solution containing the composition G1 for light wavelength conversion particles and the poor solvent was raised to 50 °C. Suspension polymerization was carried out over 3 hours at a state where the temperature of the reaction solution was 50 °C. Then, to completely deactivate the thermal radical initiator, the temperature of the reaction solution was raised to 80 °C, and the reaction solution was stirred for 3 hours at a state where the temperature of the reaction solution was 80 °C to obtain particulate polymers. Then, the reaction solution containing the polymers in the polymerization vessel was cooled to room temperature while being stirred by the stirring device. Next, the reaction solution was suction filtered, the residue of the filtration was washed with ion-exchanged water, and then the liquid was removed to obtain light wavelength conversion particles 1. In the light wavelength conversion particles 1, the green-emitting quantum dots were encapsulated in the resin particles, and the average particle diameter of the light wavelength conversion particles 1 was 3 μm. The average particle diameter of the light wavelength conversion particles A1 was measured by a transmission electron microscope for 20 light ... ... ... ... It was determined by measuring the particle diameter of the wavelength-converting particles G1 and calculating the average value thereof. Note that The average particle diameters of the following optical wavelength-converting particles 2 to 12 were also determined by the same method as that for the optical wavelength-converting particle 1. .

[0154] (Optical wavelength-converting particle R1) In the optical wavelength-converting particle B1, instead of the green light-emitting quantum dots, red light-emitting quantum dots (Product name: "CdSe / ZnS 610", manufactured by SIGMA-ALDRICH, core: Cd Se, shell: ZnS, average particle diameter 5.2 nm) 1.0 part by mass was used, and the optical wavelength-converting particle R1 was obtained by the same procedure as that for the optical wavelength-converting particle G1, except that the composition R1 for the optical wavelength-converting particles was used. In the optical wavelength-converting particle R1, the red light-emitting quantum dots were encapsulated in the resin particles, and the average particle diameter of the optical wavelength-converting particle R1 was 3 μm.

[0155] (Optical wavelength-converting particle G2) A silica glass layer as a barrier layer was formed on the surface of the resin particles of the optical wavelength-converting particle G1 to obtain the optical wavelength-converting particle 2. The formation of the barrier layer was carried out as follows. First, the surface of the optical wavelength-converting particle 1 was covered with dodecylamine and then mixed with toluene (0.4 mL). Next, tetraethoxysilane (TEOS, 10 μL) was added to this mixture and stirred for 3 hours to prepare an organic mixture 1. On the other hand, 3-mercaptopropyltrimethoxysilane (MPS, 1 μL) was mixed with ethanol (25 mL) and aqueous ammonia (4 mL, ammonia concentration 10 wt%) to prepare an aqueous solution 2. Then, the organic mixture 1 and the aqueous solution 2 were mixed and stirred for 3 hours. As a result, the resin particles precipitated in the aqueous phase. The resin particles were taken out by centrifugation. Finally, 0.5 mL of the aqueous solution containing the above resin particles was taken out and ethanol (8 m L) was added thereto. L) and aqueous ammonia (0.1 mL, 25 wt%) were added, and further TEOS (14 μL) was added. As a result, light wavelength conversion particles G2 were obtained in which the surface of the resin particles of the light wavelength conversion particles G1 was covered with a silica glass layer with a film thickness of 50 nm. The average particle diameter of the light wavelength conversion particles G2 was 3.1 μ m.

[0156] (Light wavelength conversion particles R2) In the light wavelength conversion particles R2, light wavelength conversion particles R1 were used instead of the light wavelength conversion particles G1, and the light wavelength conversion particles R2 were obtained by the same procedure as the light wavelength conversion particles G2, except that was used. The average particle diameter of the light wavelength conversion particles R2 was 3.1 μm.

[0157] (Light wavelength conversion particles G3) Instead of the composition G1 for light wavelength conversion particles, 90 parts by mass of tricyclodecane dimethanol diacrylate (product name "A-DCP", manufactured by Shin-Nakamura Chemical Co., Ltd.), 10 parts by mass of tetraethylene glycol bis(3-mercaptopropionate) (product name "EGMP-4", manufactured by SC Organic Chemicals Co., Ltd. ), 1.0 part by mass of green light-emitting quantum dots (product name "CdSe / ZnS 530", manufactured by SIGMA -ALDRICH, core: CdSe, shell: ZnS, average particle diameter 3.3 nm), and 1 part by mass of a thermal radical polymerization initiator (2,2'-azobis(2,4-dimethylvaleronitrile), manufactured by Tokyo Chemical Industry Co., Ltd.) were used to obtain a composition G2 for light wavelength conversion particles. Except for this, the light wavelength conversion particles G3 were obtained by the same procedure as the light wavelength conversion particles G1. In the light wavelength conversion particles 3, green light-emitting quantum dots were encapsulated in the resin particles, and the average particle diameter of the light wavelength conversion particles G3 was 3 μm.

[0158] (Light wavelength conversion particles R3) In the optical wavelength conversion particle R3, instead of the green light-emitting quantum dots, red light-emitting quantum dots (Product name: "CdSe / ZnS 610", manufactured by SIGMA-ALDRICH, core: Cd Se, shell: ZnS, average particle diameter 5.2 nm) 1.0 part by mass was used for the optical wavelength conversion particle Except for using the composition R2, the optical wavelength conversion particle R3 was obtained by the same procedure as the optical wavelength conversion particle G3. In the optical wavelength conversion particle R3, the red light-emitting quantum dots were encapsulated in the resin particles , and the average particle diameter of the optical wavelength conversion particle R3 was 3 μm.

[0159] (Optical wavelength conversion particle G4) Instead of the composition G1 for the optical wavelength conversion particle, 50 parts by mass of tricyclodecane dimethanol diacrylate (Product name: "A-DCP", manufactured by Shin-Nakamura Chemical Co., Ltd.), 50 parts by mass of tert-butyl mercaptan , 1 .0 part by mass of green light-emitting quantum dots (product name: "CdSe / ZnS 530", manufactured by SIG MA-ALDRICH, core: CdSe, shell: ZnS, average particle diameter 3.3 nm), and 1 part by mass of a thermal radical polymerization initiator (2,2'-azobis(2,4-dimethylvaleronitrile), manufactured by Tokyo Chemical Industry Co., Ltd.) were used to obtain the optical wavelength conversion particle G4 by the same procedure as the optical wavelength conversion particle G1, except that the composition G3 for the optical wavelength conversion particle was used. In the optical wavelength conversion particle G4, the green light-emitting quantum dots and the red light-emitting quantum dots were encapsulated in the resin particles , and the average particle diameter of the optical wavelength conversion particle G4 was 3 μm.

[0160] (Optical wavelength conversion particle R4) In the optical wavelength conversion particle R4, instead of the green light-emitting quantum dots, red light-emitting quantum dots (Product name: "CdSe / ZnS 610", manufactured by SIGMA-ALDRICH, core: Cd For wavelength-converting particles containing 1.0 part by mass of Se, shell: ZnS, average particle diameter 5.2 nm Except for using Composition R3, wavelength-converting particles R4 were obtained by the same procedure as for wavelength-converting particles G4. In the wavelength-converting particles R4, red-emitting quantum dots were encapsulated in resin particles, and the average particle diameter of the wavelength-converting particles R4 was 3 μm.

[0161] (Wavelength-converting particles G5) Instead of Composition G1 for wavelength-converting particles, 50 parts by mass of tricyclodecane dimethanol diacrylate (product name "A-DCP", manufactured by Shin-Nakamura Chemical Co., Ltd.), 50 parts by mass of 2-methacryloyloxyethyl acid phosphate (product name "Light Ester P-2M", manufactured by Kyoeisha Chemical Co., Ltd.), 1.0 part by mass of green-emitting quantum dots (product name "CdSe / ZnS 530", manufactured by SIGMA-ALDRICH, core: CdSe, shell: ZnS, average particle diameter 3.3 nm), and 1 part by mass of a thermal radical polymerization initiator (2,2'-azobis(2,4-dimethylvaleronitrile), manufactured by Tokyo Chemical Industry Co., Ltd.) were used to obtain Composition G4 for wavelength-converting particles. Except for this, wavelength-converting particles G5 were obtained by the same procedure as for wavelength-converting particles G1. In the wavelength-converting particles G5, green-emitting quantum dots were encapsulated in resin particles, and the average particle diameter of the wavelength-converting particles G5 was 3 μm.

[0162] (Wavelength-converting particles R5) In the wavelength-converting particles R5, instead of green-emitting quantum dots, 1.0 part by mass of red-emitting quantum dots (product name "CdSe / ZnS 610", manufactured by SIGMA-ALDRICH, core: CdSe, shell: ZnS, average particle diameter 5.2 nm) were used for the wavelength-converting particles. ​​​​​​​​​​​​​Except for using the composition R4, the optical wavelength conversion particles R5 were obtained by the same procedure as the optical wavelength conversion particles G5. In the optical wavelength conversion particles R5, red-emitting quantum dots were encapsulated in resin particles, and the average particle diameter of the optical wavelength conversion particles R5 was 3 μm.

[0163] (Optical wavelength conversion particles G6) Instead of the composition G1 for optical wavelength conversion particles, 50 parts by mass of tricyclodecane dimethanol diacrylate (product name "A-DCP", manufactured by Shin-Nakamura Chemical Co., Ltd.), 50 parts by mass of triphenylphosphine (product name "JC-263", manufactured by Johoku Chemical Co., Ltd.), 1.0 part by mass of green-emitting quantum dots (product name "CdSe / ZnS 530", manufactured by SIGMA-ALDRICH, core: CdSe, shell: ZnS, average particle diameter 3.3 nm), and 1 part by mass of a thermal radical polymerization initiator (2,2'-azobis(2,4-dimethylvaleronitrile), manufactured by Tokyo Chemical Industry Co., Ltd.) were used. Except for using the composition G5 for optical wavelength conversion particles, the optical wavelength conversion particles G6 were obtained by the same procedure as the optical wavelength conversion particles G1. (product name "JC-263", manufactured by Johoku Chemical Co., Ltd.), 1.0 part by mass of green-emitting quantum dots (product name "CdSe / ZnS 530", manufactured by SIGMA-ALDRICH, core: CdSe, shell: ZnS, average particle diameter 3.3 nm), and 1 part by mass of a thermal radical polymerization initiator (2,2'-azobis(2,4-dimethylvaleronitrile), manufactured by Tokyo Chemical Industry Co., Ltd.) were used. Except for using the composition G5 for optical wavelength conversion particles, the optical wavelength conversion particles G6 were obtained by the same procedure as the optical wavelength conversion particles G1. In the optical wavelength conversion particles G6, green-emitting quantum dots were encapsulated in resin particles, and the average particle diameter of the optical wavelength conversion particles G6 was 3 μm. In the optical wavelength conversion particles G6, green-emitting quantum dots were encapsulated in resin particles, and the average particle diameter of the optical wavelength conversion particles G6 was 3 μm.

[0164] (Optical wavelength conversion particles R6) In the optical wavelength conversion particles R6, instead of the green-emitting quantum dots, 1.0 part by mass of red-emitting quantum dots (product name "CdSe / ZnS 610", manufactured by SIGMA-ALDRICH, core: CdSe, shell: ZnS, average particle diameter 5.2 nm) were included. Except for using the composition R5 for optical wavelength conversion particles, the optical wavelength conversion particles R6 were obtained by the same procedure as the optical wavelength conversion particles G6. (product name "CdSe / ZnS 610", manufactured by SIGMA-ALDRICH, core: CdSe, shell: ZnS, average particle diameter 5.2 nm) were included. Except for using the composition R5 for optical wavelength conversion particles, the optical wavelength conversion particles R6 were obtained by the same procedure as the optical wavelength conversion particles G6. In the optical wavelength conversion particles R6, red-emitting quantum dots were encapsulated in resin particles. In addition, the average particle diameter of the optical wavelength conversion particles R6 was 3 μm.

[0165] (Optical wavelength conversion particles G7) Instead of the composition G1 for the optical wavelength conversion particles, 50 parts by mass of tricyclodecane dimethanol diacrylate (product name "A-DCP", manufactured by Shin-Nakamura Chemical Co., Ltd.), 50 parts by mass of stearylamine (product name "Farmin 80", manufactured by Kao Corporation), 1.0 part by mass of green-emitting quantum dots (product name "CdSe / ZnS 530", manufactured by SIGMA-ALDRICH, core: CdSe, shell: Zn S, average particle diameter 3.3 nm), and 1 part by mass of a thermal radical polymerization initiator (2,2'-azo bis(2,4-dimethylvaleronitrile), manufactured by Tokyo Chemical Industry Co., Ltd.) were used to obtain optical wavelength conversion particles G7 in the same procedure as for the optical wavelength conversion particles G1, except that the composition G6 for the optical wavelength conversion particles was used. In the optical wavelength conversion particles G7, the green-emitting quantum dots were encapsulated in the resin particles, and the average particle diameter of the optical wavelength conversion particles G7 was 3 μm.

[0166] (Optical wavelength conversion particles R7) In the optical wavelength conversion particles R7, instead of the green-emitting quantum dots, red-emitting quantum dots (product name "CdSe / ZnS 610", manufactured by SIGMA-ALDRICH, core: Cd Se, shell: ZnS, average particle diameter 5.2 nm) 1.0 part by mass was included, and optical wavelength conversion particles R7 were obtained in the same procedure as for the optical wavelength conversion particles G7, except that the composition R6 for the optical wavelength conversion particles was used. In the optical wavelength conversion particles R7, the red-emitting quantum dots were encapsulated in the resin particles, and the average particle diameter of the optical wavelength conversion particles R7 was 3 μm.

[0167] (Optical wavelength conversion particles G8) ​​​​​Instead of the composition 1 for light wavelength conversion particles, tricyclodecane dimethanol diacrylate (product name "A-DCP", manufactured by Shin-Nakamura Chemical Co., Ltd.) 50 parts by mass, oleylamine (product name " Amine OB", manufactured by NOF Corporation) 50 parts by mass, green-emitting quantum dots (product name "CdSe / ZnS 530", manufactured by SIGMA-ALDRICH, core: CdSe, shell: ZnS, average particle size 3.3 nm) 1.0 part by mass, and a thermal radical polymerization initiator (2,2'-azobis(2 ,4-dimethylvaleronitrile), manufactured by Tokyo Chemical Industry Co., Ltd.) 1 part by mass, a composition G7 for light wavelength conversion particles was used. Except for this, light wavelength conversion particles G8 were obtained by the same procedure as light wavelength conversion particles G1. In light wavelength conversion particles G8, green-emitting quantum dots were encapsulated in resin particles, and the average particle size of light wavelength conversion particles G8 was 3 μm.

[0168] (Light wavelength conversion particles R8) In light wavelength conversion particles R8, instead of green-emitting quantum dots, red-emitting quantum dots (product name "CdSe / ZnS 610", manufactured by SIGMA-ALDRICH, core: Cd Se, shell: ZnS, average particle size 5.2 nm) 1.0 part by mass were included. Except for using composition R7 for light wavelength conversion particles, light wavelength conversion particles R8 were obtained by the same procedure as light wavelength conversion particles G8. In light wavelength conversion particles R8, red-emitting quantum dots were encapsulated in resin particles, and the average particle size of light wavelength conversion particles R8 was 3 μm.

[0169] (Light wavelength conversion particles G9) Instead of the composition G1 for light wavelength conversion particles, tricyclodecane dimethanol diacrylate to (product name "A-DCP", manufactured by Shin-Nakamura Chemical Co., Ltd.) 50 parts by mass, ω-carboxy-polyca Pro lactone mono (meth) acrylate (product name "M-5300", manufactured by Toagosei Co., Ltd.) 50 parts by mass, green light-emitting quantum dots (product name "CdSe / ZnS 530", manufactured by SIGMA-AL DRICH, core: CdSe, shell: ZnS, average particle size 3.3 nm) 1.0 part by mass , and a thermal radical polymerization initiator (2,2'-azobis(2,4-dimethylvaleronitrile ), manufactured by Tokyo Chemical Industry Co., Ltd.) 1 part by mass, except that the composition G8 for light wavelength conversion particles was used was obtained by the same procedure as the light wavelength conversion particles G1. In the light wavelength conversion particles G9, the green light-emitting quantum dots were encapsulated in the resin particles, and the average particle size of the light wavelength conversion particles G 9 was 3 μm.

[0170] (Light wavelength conversion particles R9) In the light wavelength conversion particles R9, instead of the green light-emitting quantum dots, red light-emitting quantum dots (product name "CdSe / ZnS 610", manufactured by SIGMA-ALDRICH, core: Cd Se, shell: ZnS, average particle size 5.2 nm) 1.0 part by mass was included in the composition R8 for light wavelength conversion particles , and the light wavelength conversion particles R9 were obtained by the same procedure as the light wavelength conversion particles G9. In the light wavelength conversion particles R9, the red light-emitting quantum dots were encapsulated in the resin particles , and the average particle size of the light wavelength conversion particles R9 was 3 μm.

[0171] (Light wavelength conversion particles G10) Instead of the composition G1 for light wavelength conversion particles, tricyclodecane dimethanol diacrylate (product name "A-DCP", manufactured by Shin-Nakamura Chemical Co., Ltd.) 50 parts by mass, 2-acryloyloxy ethyl succinate (product name "NK ester A-SA", manufactured by Shin-Nakamura Chemical Co., Ltd.) 50 parts by mass ​, green-emitting quantum dots (product name "CdSe / ZnS 530", manufactured by SIGMA-ALDRI manufactured by CH Co., core: CdSe, shell: ZnS, average particle size 3.3 nm) 1.0 part by mass, and thermal radical polymerization initiator (2,2'-azobis(2,4-dimethylvaleronitrile), manufactured by Tokyo Chemical Industry Co., Ltd.) 1 part by mass, except for using the composition G9 for light wavelength conversion particles, light wavelength conversion particles G10 were obtained by the same procedure as light wavelength conversion particles G1. In the light wavelength conversion particles G10, green-emitting quantum dots are encapsulated in resin particles, and the average particle size of the light wavelength conversion particles G1 0 was 3 μm.

[0172] (Light wavelength conversion particles R10) In the light wavelength conversion particles R10, instead of green-emitting quantum dots, red-emitting quantum dots (product name "CdSe / ZnS 610", manufactured by SIGMA-ALDRICH Co., core: C dSe, shell: ZnS, average particle size 5.2 nm) 1.0 part by mass was used. Except for this, light wavelength conversion particles R10 were obtained by the same procedure as light wavelength conversion particles G10. In the light wavelength conversion particles R10, red-emitting quantum dots are encapsulated in resin particles, and the average particle size of the light wavelength conversion particles R10 was 3 μm.

[0173] (Light wavelength conversion particles G11) First, 0.2 part by mass of green-emitting quantum dots (product name "CdSe / ZnS 530", S IGMA-ALDRICH Co., core: CdSe, shell: ZnS, average particle size 3.3 n m) was prepared. After preparing the green-emitting quantum dots, the surface of the green-emitting quantum dots was covered with dodecyl amine, and these quantum dots were added to a toluene solution (0.4 mL, 1.5 μM / L) It was dispersed. Next, tetraethoxysilane (TEOS, 10 μL) was added to this solution , and it was stirred for 3 hours to prepare Organic Solution 1.

[0174] On the other hand, 3-mercaptopropyltrimethoxysilane (MPS, 1 μL) was mixed with ethanol (25 mL) and aqueous ammonia (4 mL, ammonia concentration 10 wt%) to prepare Aqueous Solution 2 .

[0175] Then, Organic Solution 1 and Aqueous Solution 2 were mixed and stirred for 3 hours. As a result, the green-emitting quantum dots and the red-emitting quantum dots moved to the aqueous phase, and further, aggregates of the green-emitting quantum dots and the red -emitting quantum dots were formed. This aggregate was taken out by centrifugation.

[0176] Finally, 0.5 mL of the aqueous solution in which the above aggregate was dispersed was taken out, ethanol (8 mL) and aqueous ammonia (0.1 mL, 25 wt%) were added, and further TEOS (14 μL) was added . As a result, the aggregate composed of green-emitting quantum dots was wrapped with silica glass, and light wavelength conversion particles 11 with an average particle size of 50 nm were obtained. (Light wavelength conversion particles G11)

[0177] (Light wavelength conversion particles R11) In the light wavelength conversion particles R11, instead of the green-emitting quantum dots, red-emitting quantum dots (product name "CdSe / ZnS 610", manufactured by SIGMA-ALDRICH, core: CdSe, shell: ZnS, average particle size 5.2 nm) 0.2 parts by mass were used. Except for this, light wavelength conversion particles R11 were obtained by the same procedure as the light wavelength conversion particles G11. In the light wavelength conversion particles R 11, the red-emitting quantum dots were wrapped with silica glass, and the average particle size of the light wavelength conversion particles R11 was 50 nm.

[0178] (Light wavelength conversion particles G12) Instead of the composition G1 for light wavelength conversion particles, tricyclodecane dimethanol diacrylate (product name "A-DCP", manufactured by Shin-Nakamura Chemical Co., Ltd.) 100 mass parts, green light-emitting quantum dots ( Product name: "CdSe / ZnS 530", manufactured by SIGMA-ALDRICH, core: CdS e, shell: ZnS, average particle size 3.3 nm) 1.0 mass part, and thermal radical polymerization initiator (2,2'-azobis(2,4-dimethylvaleronitrile), manufactured by Tokyo Chemical Industry Co., Ltd.) 1 mass The same procedure was followed as for the light wavelength converting particles G1, except that a light wavelength converting particle composition G10 consisting of parts was used. The light wavelength conversion particles G12 were obtained by the same procedure. The light-emitting quantum dots are encapsulated in resin particles, and the average particle diameter of the light wavelength conversion particles G12 is 12 μm.

[0179] (Light wavelength conversion particles R12) In the light wavelength conversion particle R12, red light emitting quantum dots are used instead of green light emitting quantum dots. (Product name: CdSe / ZnS 610, manufactured by SIGMA-ALDRICH, core: C Light wavelength conversion particles containing 1.0 mass part of dSe, shell: ZnS, average particle size 5.2 nm The light wavelength conversion particles G12 were obtained by the same procedure as that for the light wavelength conversion particles G12, except that the composition R10 for the light wavelength conversion was used. The light wavelength conversion particles R12 were obtained. In the light wavelength conversion particles R12, red light emitting quantum dots were The light wavelength converting particles R12 had an average particle size of 12 μm.

[0180] <Preparation of Curable Resin Composition> A curable resin composition was obtained according to the following procedure. First, methyl methacrylate was added to a polymerization tank. (MMA) 63 parts by mass, acrylic acid (AA) 12 parts by mass, methacrylic acid-2-hydroxy 6 parts by mass of diethylene glycol dimethyl ether (DMDG 88 parts by mass of 2,2'-azobis(2-methylbutyronyl) was added and dissolved by stirring. Then, 7 parts by mass of toluene was added and dissolved uniformly. After that, the mixture was stirred at 85°C for 2 hours under a nitrogen stream. The mixture was stirred and reacted at 100° C. for 1 hour. The resulting solution was further added with glycidyl methacrylate. (GMA) 7 parts by mass, triethylamine 0.4 parts by mass, and hydroquinone 0.2 parts by mass were added and stirred at 100°C for 5 hours to obtain an alkali-soluble resin having an ethylenically unsaturated group. Fat solution 1 (solid content 50%) was obtained.

[0181] Next, the above-mentioned alkali-soluble resin solution 1 was used to prepare a curable resin composition 1 having the following composition: Got it. (Curable resin composition 1) Alkali-soluble resin solution 1 (solid content 50%): 58 parts by weight Dipentaerythritol pentaacrylate (product name "SR399", manufactured by Sartomer Corporation) ):17 parts by mass Polymerization initiator (product name: Irgacure (registered trademark) 907, manufactured by BASF Japan Ltd.) ):4 parts by mass Diethylene glycol dimethyl ether: 21 parts by weight

[0182] <Preparation of composition for light wavelength conversion layer> The components were mixed so as to obtain the composition shown below, thereby obtaining a composition for a light wavelength conversion layer. (Optical wavelength conversion layer composition G1) Tetraethylene glycol bis(3-mercaptopropionate) (product name: EGMP -4'', manufactured by SC Organic Chemical Co., Ltd.): 10 parts by mass ·Curable resin composition 1 (solid content 50%): 20 parts by mass Light wavelength conversion particles G1: 5 parts by weight 3-Methoxybutyl acetate: 70 parts by weight

[0183] (Compositions G2 - G12, R1 - R12 for the light wavelength conversion layer) In the compositions G2 - G12, R1 - R12 for the light wavelength conversion layer, instead of the light wavelength conversion particles G1, the composition was adjusted in the same manner as the light wavelength conversion composition G1, except that 5 parts by mass of the light wavelength conversion particles shown in Table 2 were used.

[0184] (Composition G13 for the light wavelength conversion layer) · Tetraethylene glycol bis(3 - mercaptopropionate) (Product name "EGMP - 4", manufactured by SC Organic Chemicals): 10 parts by mass · Curable resin composition 1 (solid content 50%): 20 parts by mass · Green - emitting quantum dots (Product name "CdSe / ZnS 530", manufactured by SIGMA - ALDRICH CH, core: CdSe, shell: ZnS, average particle size 3.3 nm): 0.2 parts by mass · 3 - Methoxybutyl acetate: 70 parts by mass

[0185] (Composition R13 for the light wavelength conversion layer) · Tetraethylene glycol bis(3 - mercaptopropionate) (Product name "EGMP - 4", manufactured by SC Organic Chemicals): 10 parts by mass · Curable resin composition 1 (solid content 50%): 20 parts by mass · Red - emitting quantum dots (Product name "CdSe / ZnS 610", manufactured by SIGMA - ALDRICH CH, core: CdSe, shell: ZnS, average particle size 5.2 nm): 0.2 parts by mass · 3 - Methoxybutyl acetate: 70 parts by mass

[0186] <Adjustment of the composition for the light - shielding layer> First, each component was blended so as to have the following composition to obtain a black pigment dispersion liquid 1. (Black pigment dispersion liquid 1) · Black pigment: 23 parts by mass ​​​· Polymer dispersion material (product name: "Disperbyk 111", manufactured by BYK Japan): 2 parts by mass · Diethylene glycol dimethyl ether: 75 parts by mass

[0187] Next, each component was blended so as to have the composition shown below to obtain a composition 1 for a light-shielding layer. (Composition 1 for a light-shielding layer) · Black pigment dispersion liquid 1: 61 parts by mass · Curable resin composition 1: 20 parts by mass · Diethylene glycol dimethyl ether: 30 parts by mass

[0188] <Adjustment of composition for blue coloring layer> First, each component was blended so as to have the composition shown below to obtain a blue pigment dispersion liquid 1. (Blue pigment dispersion liquid 1) · Blue pigment (C.I. Pigment Blue 15:6): 23 parts by mass · Polymer dispersion material (product name: "Disperbyk 111", manufactured by BYK Japan): 2 parts by mass · Diethylene glycol dimethyl ether: 75 parts by mass

[0189] Next, each component was blended so as to have the composition shown below to obtain a composition 1 for a blue coloring layer. (Composition 1 for a blue coloring layer) · Blue pigment dispersion liquid 1: 61 parts by mass · Curable resin composition 1: 20 parts by mass · Diethylene glycol dimethyl ether: 30 parts by mass

[0190] <Adjustment of composition for green coloring layer> First, each component was blended so as to have the composition shown below to obtain a green pigment dispersion liquid 1. (Green pigment dispersion liquid 1) · Green pigment (C.I. Pigment Green 58): 23 parts by mass · Polymer dispersion material (product name: "Disperbyk 111", manufactured by BYK Japan): 2 parts by mass · Diethylene glycol dimethyl ether: 75 parts by mass

[0191] Next, each component was blended so as to have the composition shown below to obtain Composition 1 for the green coloring layer. (Composition 1 for the green coloring layer) · Green pigment dispersion 1: 61 parts by mass · Curable resin composition 1: 20 parts by mass · Diethylene glycol dimethyl ether: 30 parts by mass

[0192] <Preparation of the composition for the red coloring layer> First, each component was blended so as to have the composition shown below to obtain Red pigment dispersion 1. (Red pigment dispersion 1) · Red pigment (C.I. Pigment Red 254): 23 parts by mass · Polymer dispersant (product name "Disperbyk111", manufactured by BYK Japan): 2 parts by mass · Diethylene glycol dimethyl ether: 75 parts by mass

[0193] Next, each component was blended so as to have the composition shown below to obtain Composition 1 for the red coloring layer. (Composition 1 for the red coloring layer) · Red pigment dispersion 1: 61 parts by mass · Curable resin composition 1: 20 parts by mass · Diethylene glycol dimethyl ether: 30 parts by mass

[0194] <Preparation of the composition for the light-diffusing layer> Each component was blended so as to have the composition shown below to obtain Composition 1 for the light-diffusing layer. (Composition 1 for the light-diffusing layer) · Tetraethylene glycol bis(3-mercaptopropionate) (product name "EGMP -4", manufactured by SC Organic Chemistry Co., Ltd.): 10 parts by mass · Curable resin composition 1 (solid content 50%): 20 parts by mass · Light-scattering particles (crosslinked polystyrene resin particles, product name "SBX-4", Sekisui Chemical Co., Ltd. Manufactured by a corporation, average particle diameter 4 μm): 2 parts by mass · 3-methoxybutyl acetate: 70 parts by mass

[0195] <Example 1> First, a light-shielding layer was applied onto a glass substrate with a thickness of 0.7 mm (product name "AN100", manufactured by Asahi Glass Co., Ltd.) using Composition 1 for the light-shielding layer by spin coating, dried at 100 °C for 3 minutes, and a coating film with a film thickness of approximately 2.5 μm was formed. Then, this coating film was exposed to light of a predetermined shape using an ultra-high pressure mercury lamp, and then developed with a 0.05 wt% aqueous potassium hydroxide solution, and thereafter, the substrate was left in an atmosphere of 180 °C for 30 minutes to perform heat treatment, thereby forming a light-shielding layer having a plurality of openings. On the substrate on which the light-shielding layer was formed, Composition 1 for the blue coloring layer was applied into the openings of the light-shielding layer by spin coating method, and then dried in an oven at 70 °C for 3 minutes. Next

[0196] a photomask was placed at a distance of 100 μm from the coating film of Composition 1 for the blue coloring layer, and ultraviolet light was irradiated only onto the openings where blue sub-pixels were to be formed for 10 seconds using a proximity mitia liner and an ultra-high pressure mercury lamp of 2.0 kW. Next, it was immersed in a 0.05 mass% aqueous potassium hydroxide solution ( solution temperature 23 °C) for 1 minute for alkali development, and only the uncured portion of this coating film was removed . Thereafter, the substrate was left in an atmosphere of 180 °C for 30 minutes to perform heat treatment and a blue coloring layer with a film thickness of 0.3 μm was formed in the openings where blue sub-pixels were to be formed. . Then, using Composition 1 for the green coloring layer, a green coloring layer with a film thickness of 0.3 μm was formed in the openings where green sub-pixels were to be formed in the same process as the formation process of the blue coloring layer. Further, using Composition 1 for the red coloring layer, a red sub-pixel was formed in the same process as the formation process of the blue coloring layer

[0197] ​​​​​A red colored layer with a film thickness of 0.3 μm was formed in the should - be opening.

[0198] After forming a colored layer such as a red colored layer, using the composition 1 for the light - diffusing layer, the formation of a blue colored layer In the same process as the process, in the opening where the blue sub - pixel should be formed and on the blue colored layer, a light - diffusing layer with a film thickness of 1.9 μ m was formed.

[0199] Next, using the composition G1 for the wavelength - converting layer, in the same process as the process of forming the blue colored layer, in the opening where the green sub - pixel should be formed and on the green colored layer, a wavelength - converting layer G1 with a film thickness of 1.9 μm was formed.

[0200] After that, using the composition R1 for the wavelength - converting layer, in the same process as the process of forming the blue colored layer, in the opening where the red sub - pixel should be formed and on the red colored layer, a wavelength - converting layer R1 with a film thickness of 1.9 μm was formed.

[0201] Finally, at the positions corresponding to each sub - pixel, a substrate having a plurality of LED packages in which blue LEDs with an emission peak wavelength of 450 nm are recessed is attached to the light - diffusing layer, the wavelength - converting layer G1, and the wavelength - converting layer R1 via an OCA layer (product name "high - transparency adhesive transfer tape 8146 - 2", manufactured by 3M). In this way, the image display device according to Example 1 was obtained. The light - shielding layer was in contact with the LED package.

[0202] <Examples 2 - 11 and Comparative Examples 1, 2> In Examples 2 - 11 and Comparative Examples 1, 2, except that the compositions for the wavelength - converting layers G1 and R1 were replaced with the respective compositions for the wavelength - converting layers shown in Table 2, in the same manner as in Example 1, an image display device was fabricated. In the image display devices according to Comparative Examples 1 and 2, the light - shielding layer The distance between the layer and the LED package was adjusted so that it would be 20 μm or more.

[0203] <Example 12> In Example 12, up to the formation of the light diffusion layer, it was the same as in Example 1. However, after forming the light diffusion layer, using the composition G13 for the wavelength conversion layer, in the same process as the formation process of the blue color layer, a wavelength conversion layer G13 with a film thickness of 1.9 μm was formed within the opening where the green sub-pixel was to be formed and on the green color layer. Thereafter, using the composition R13 for the wavelength conversion layer, in the same process as the formation process of the blue color layer, a wavelength conversion layer R13 with a film thickness of 1.9 μ m was formed within the opening where the red sub-pixel was to be formed and on the red color layer. Next, after forming the wavelength conversion layer R13, using the composition 1 for the blue color layer, in the same process as the formation process of the blue color layer, within the opening where the green sub-pixel was to be formed and on the wavelength conversion layer G1, and also within the opening where the red sub-pixel was to be formed and on the wavelength conversion layer R1, a blue color layer with a film thickness of 0.3 μm

[0204] Finally, at positions corresponding to each sub-pixel, a substrate having a plurality of LED packages with blue LEDs with an emission peak wavelength of 450 nm disposed in recessed portions was attached to the glass substrate through an OCA layer (product name "High transparency adhesive transfer tape 8146-2", manufactured by 3M). Thereby,

[0205] <Confirmation of specific elements and carboxylic acids in resin particles> In the wavelength conversion particles G1 to G10, G12, R1 to R10, R12, from the resin particles It was confirmed whether or not the above-specified element or carboxylic acid was detected. Specifically, for wavelength conversion For the particles G1 to G8, G12, R1 to R8, and R12, using an energy dispersive X-ray analyzer (product name "JEM-2800" (100 mm 2 equipped with a silicon drift detector (SDD) ), manufactured by JEOL Ltd.), under the conditions of an acceleration voltage of 100 kV and a measurement time of 30 seconds, at any position on the surface or inside of the resin particles that are 3 nm or more away from the surface of the shell of the quantum dots it was confirmed whether or not at least any one of sulfur element, phosphorus element, and nitrogen element was detected. Also, for the wavelength conversion particles G9, G10, G12, R9, R10, and R12 using an infrared microscope (product name "Nicolet iN10", manufactured by Thermo Fisher Scientific), at any position on the surface or inside of the resin particles that are 3 nm or more away from the surface of the shell of the quantum dots it was confirmed whether or not carboxylic acid was detected. The confirmation criteria were as follows. ○: Any one of sulfur element, phosphorus element, nitrogen element, and carboxylic acid was detected. ×: None of sulfur element, phosphorus element, nitrogen element, and carboxylic acid was detected.

[0206] <Measurement of content of specific element> For the wavelength conversion particles G1 to G8, G12, R1 to R8, and R12, the content of the specific element contained in the wavelength conversion particles was measured using a fluorescence X-ray analyzer (product name "EDX-800HS", manufactured by Shimadzu Corporation). The content of the specific element was taken as the average value of the values obtained by measuring three times.

[0207] <Measurement of luminance maintenance rate after heat resistance test> In the image display devices according to the above examples and comparative examples, the image display devices were placed in an environment at 80°C A heat resistance test was carried out by leaving it for 500 hours, and the luminance maintenance rate after the heat resistance test with respect to the luminance before the heat resistance test in the image display device was examined. Specifically, first, the blue LED of the image display device before the heat resistance test was turned on, and the luminance of the light emitted from the display surface of the image display device was measured at a position 400 mm away from the light emitting surface of the display surface of the image display device in the thickness direction of the image display device. using a spectro-radiance meter (product name "CS2000", manufactured by Konica Minolta) under the condition of a measurement angle of 1°. Next, this image display device was subjected to a heat resistance test by leaving the image display device in an environment of 80°C for 500 hours. Then, the blue LED of the image display device after the heat resistance test was turned on, and the luminance of the light emitted from the display surface of the image display device was measured at a position 400 mm away from the light emitting surface of the display surface of the image display device in the thickness direction of the image display device using a spectro-radiance meter (product name "CS2000", manufactured by Konica Minolta) under the condition of a measurement angle of 1°.

[0208] Subsequently, the luminance maintenance rate after the heat resistance test with respect to the luminance before the heat resistance test was obtained from these measured luminances. The luminance maintenance rate is represented by A, the luminance of the light emitted from the display surface of the image display device before the heat resistance test is represented by B, and the luminance of the light emitted from the display surface of the image display device after the heat resistance test is represented by C, and is obtained by the following formula.

[0209] A = C / B × 100

[0210] The results are shown in Table 1 and Table 2 below.

Table 1

[0211]

Table 2

[0212] The results will be described below. As can be seen from Table 2, in the image display devices according to Examples 1 to 11, quantum dots encapsulated in wavelength-converting particles 1 to 10 in which quantum dots are encapsulated in resin particles containing at least any one of specific elements and carboxylic acids or in wavelength-converting particles 11 in which quantum dots are encapsulated in barrier particles are used. Therefore, compared with the image display device according to Comparative Example 1 that does not use the resin particles or the barrier particles themselves and the image display device according to Comparative Example 2 that uses resin particles encapsulating quantum dots but does not contain any of the specific elements and carboxylic acids, the luminance maintenance rate after the heat resistance test was high. Further, in the image display device according to Example 12, although resin particles and barrier particles are not used, glass substrates are disposed on both sides of the wavelength-converting layer, so the luminance maintenance rate after the heat resistance test was high. In wavelength-converting particles G1 to 8 and R1 to 8, the content of specific elements measured by fluorescent X-ray analysis was 0.5 mass% or more. On the other hand, in wavelength-converting particle 12, the content of specific elements measured by fluorescent X-ray analysis was less than 0.5 mass%. Incidentally, in wavelength-converting particles G12 and R12, although the composition for wavelength-converting particles G10 and R10 used when forming wavelength-converting particles G12 and R12 does not contain specific elements, the content of specific elements is 0.17 mass% and 0.15 mass%, respectively. This is presumably because the quantum dots themselves contained a sulfur component. In the above examples, as the core material of the green light-emitting quantum dots and the red light-emitting quantum dots, C is used. In the image display device according to Comparative Example 1, which does not use the resin particles or the barrier particles themselves, and the image display device according to Comparative Example 2, which uses resin particles encapsulating quantum dots but does not contain any of the specific elements and carboxylic acids, compared with the image display device according to Examples 1 to 11, the luminance maintenance rate after the heat resistance test was low. In the image display device according to Example 12, although resin particles and barrier particles are not used, since glass substrates are disposed on both sides of the wavelength-converting layer, the luminance maintenance rate after the heat resistance test was high.

[0213] In wavelength-converting particles G1 to 8 and R1 to 8, the content of specific elements measured by fluorescent X-ray analysis was 0.5 mass% or more. In contrast, in wavelength-converting particle 12, the content of specific elements measured by fluorescent X-ray analysis was less than 0.5 mass%. In wavelength-converting particles G12 and R12, although the composition for wavelength-converting particles G10 and R10 used when forming wavelength-converting particles G12 and R12 does not contain specific elements, the content of specific elements is 0.17 mass% and 0.15 mass%, respectively. This is presumably because the quantum dots themselves contained a sulfur component.

[0214] In the above examples, as the core material of the green light-emitting quantum dots and the red light-emitting quantum dots, C Although dSe is used, even if non-Cd-based materials such as InP and InAs are used as the core material, The same results as in the above examples were obtained.

Explanation of reference numerals

[0215] 10, 100, 120, 150... Image display device 20... Light source 23... Light-emitting element 24... Package 24A... Concave portion 30... Light-shielding layer 30A... Opening 40, 45, 110, 115, 130, 135, 160, 165... Light wavelength conversion layer 41, 46, 111, 116... Light wavelength conversion particles 41A, 46A... Quantum dots 41B, 46B... Resin particles 60, 65, 170, 175... Coloring layer 111A, 116A... Barrier particles

Claims

1. A light source comprising one or more light-emitting elements, a light-shielding layer disposed on the observer side of the light-emitting element and having an opening at a position corresponding to the light-emitting element, a light wavelength conversion layer disposed in the opening and containing light wavelength conversion particles and a binder resin, a first coloring layer disposed in the opening and on the observer side of the light wavelength conversion layer, transmitting the light wavelength-converted by the light wavelength conversion particles, and absorbing the light from the light-emitting element, a second coloring layer disposed in the opening and on the light source side of the light wavelength conversion layer, transmitting the light from the light-emitting element, and absorbing the light wavelength-converted by the light wavelength conversion particles, and comprising: the light wavelength conversion particles are first light wavelength conversion particles including light-transmissive resin particles containing nitrogen and quantum dots encapsulated in the resin particles, the quantum dots include a core made of a first semiconductor compound, a shell made of a second semiconductor compound covering the core and different from the first semiconductor compound, and a ligand bonded to the surface of the shell, the nitrogen contained in the resin particles is present at a position 3 nm or more away from the surface of the shell, the resin particles contain an amine compound, An image display device, wherein the nitrogen content in the light wavelength conversion particles measured by fluorescent X-ray analysis is 0.5% by mass or more.

2. The image display device according to claim 1, wherein the first light wavelength conversion particles further comprise a barrier layer covering the surface of the resin particles.

3. The light source further comprises one or more packages having recesses, the light-emitting element is disposed in the recess, The image display device according to claim 1 or 2, wherein the distance from the light-shielding layer to the portion of the package corresponding to the light-shielding layer is 10 μm or less.

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