Light-emitting resin ink, optical member using light-emitting resin ink, light-emitting device using optical member, power generation device, display body, method for manufacturing light-emitting resin ink, and method for manufacturing optical member

Abstract

Provided is a light-emitting resin ink containing at least a resin and a dispersion liquid containing light-emitting nanoparticles and a first solvent, wherein a liquid dielectric constant ε1 (μS / cm) of the dispersion liquid and a liquid dielectric constant ε2 (μS / cm) of the light-emitting resin ink satisfy formula (1). Also provided are: an optical member using the light-emitting resin ink; a light-emitting device using the optical member; a power generation device; a display body; a method for manufacturing a light-emitting resin ink; and a method for manufacturing an optical member.　| (ε2 - ε1) / ε1 | × 100 ≤ 10 (%) (1)

Description

Luminous resin ink, optical element using said luminous resin ink, light-emitting device, power generating device and display element using said optical element, and method for manufacturing luminous resin ink and method for manufacturing optical element

[0001] The present invention relates to a luminous resin ink, an optical member using the luminous resin ink, a light-emitting device, a power generating device and a display member using the optical member, as well as a method for manufacturing a luminous resin ink and a method for manufacturing an optical member.

[0002] In recent years, the development of optical components using luminescent nanoparticles has been progressing (Patent Documents 1 to 3). Quantum dot materials that can be used as luminescent nanoparticles are nano-sized semiconductor materials that exhibit quantum effects by confining electrons in the quantum dots.

[0003] International Publication No. 2023 / 163023 Patent Publication No. 2020-506428 Patent Publication No. 2023-107595

[0004] In order to manufacture a resin part containing luminescent nanoparticles, an ink containing luminescent nanoparticles and a resin is required. Luminescent nanoparticles are usually handled by dispersing them in a solvent. However, when a dispersion of luminescent nanoparticles is mixed with a resin to produce an ink, the photoluminescence quantum yield decreases, and it may not be possible to obtain an ink having the desired photoluminescence quantum yield. In the following description, the photoluminescence quantum yield may be referred to as "PLQY."

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a luminous resin ink that exhibits good PLQY. Furthermore, in accordance with the above-mentioned objective, the present invention provides an optical element that uses the luminous nanoink and exhibits good PLQY, as well as a light-emitting device, a power generating device, and a display that use the optical element. Another aim of the present invention is to provide a method for producing a luminous resin ink that can produce a luminous resin ink while suppressing a decrease in PLQY, and a method for producing an optical element that can produce an optical element that exhibits good PLQY.

[0006] The inventors have discovered that by setting the variation rate of the liquid dielectric constant of the luminescent resin ink relative to the liquid dielectric constant of the dispersion of luminescent nanoparticles to a predetermined value or less, it is possible to produce a luminescent resin ink while suppressing a decrease in PLQY, and have completed the present invention.

[0007] The present invention includes the following: <1> A luminous resin ink containing at least a dispersion liquid containing luminous nanoparticles and a first solvent, and a resin, wherein the liquid dielectric constant ε of the dispersion liquid is １ (μS / cm), and the liquid dielectric constant ε of the luminous resin ink ２ (μS / cm) satisfies the following formula (1): ２ -ε １ ) / ε １ |×100≦10(%) (1) <2> The liquid dielectric constant ε of the dispersion liquid １ (μS / cm), and the liquid dielectric constant ε of the luminous resin ink ２ (μS / cm) satisfies the following formula (2): |ε ２ -ε １ |≦0.25 (μS / cm) (2) <3> The luminescent resin ink contains a resin solution containing the resin and a second solvent, and the liquid dielectric constant ε of the first solvent of the dispersion liquid is １１ (μS / cm), and the liquid dielectric constant ε of the resin solution ３ (μS / cm) satisfies the following formula (3): |{(ε １１ ×p / 100+ε ３ ×q / 100)-ε １１} / ε １１ |×100≦10(%) (3) (In the formula (3), p is the weight-based content ratio (wt%) of the dispersion liquid to the luminous resin ink, q is the weight-based content ratio (wt%) of the resin solution to the luminous resin ink, and 90<(p+q)≦100 (wt%).) <4> Liquid dielectric constant ε of the first solvent of the dispersion liquid １１ (μS / cm), and the relative dielectric constant ε of the resin ４ (μS / cm) satisfies the following formula (4): |{(ε１１ ×p / 100+e ４ ×r / 100)-e １１} / e １１|×100≦10(%) (4) (In the formula (4), p is the weight ratio (% by weight) of the dispersion liquid to the luminescent resin ink, r is the weight ratio (% by weight) of the resin to the luminescent resin ink, and 90<(p+r)≦100 (% by weight).) <5> The luminescent resin ink according to any one of <1> to <4>, wherein the resin contains an olefin polymer. <6> The luminescent resin ink according to <5>, wherein the olefin polymer contains a cyclic olefin polymer. <7> The luminescent resin ink according to <6>, wherein the cyclic olefin polymer contains a norbornene polymer, and the norbornene polymer contains at least one selected from the group consisting of a hydrogenated ring-opening polymer of a monomer having a norbornene structure, an addition copolymer of a monomer having a norbornene structure and an α-olefin, and a hydrogenated copolymer thereof. <8> The luminescent resin ink according to <6> or <7>, wherein the cyclic olefin polymer comprises a hydrogenated block copolymer [E], the hydrogenated block copolymer [E] being a hydrogenated block copolymer obtained by hydrogenating a block copolymer [D] comprising a polymer block [A] mainly composed of a repeating unit [I] derived from an aromatic vinyl compound, and a polymer block [B] mainly composed of a repeating unit [I] derived from an aromatic vinyl compound and a repeating unit [II] derived from a linear conjugated diene compound, or a polymer block [C] mainly composed of a repeating unit [II] derived from a linear conjugated diene compound. <9> The luminescent resin ink according to any one of <6> to <8>, wherein the cyclic olefin polymer contains an alkoxysilyl group. <10> The luminescent resin ink according to any one of <5> to <9>, wherein the olefin polymer comprises a block copolymer [D] composed of a polymer block [A] containing a repeating unit [I] derived from an aromatic vinyl compound as a main component, and a polymer block [B] containing a repeating unit [I] derived from an aromatic vinyl compound and a repeating unit [II] derived from a linear conjugated diene compound as main components, or a polymer block [C] containing a repeating unit [II] derived from a linear conjugated diene compound as a main component.<11> The luminous resin ink according to any one of <1> to <10>, wherein the resin is contained in an amount of 10 parts by weight or more and 99.99 parts by weight or less per 100 parts by weight of the luminous resin ink, and wherein the viscosity is 10 Pa·s or less. <12> The luminous resin ink according to any one of <1> to <11>, wherein the luminous nanoparticles comprise metal halide perovskite particles having an average particle size of 1 nm or more and 30 nm or less. <13> An optical member comprising a luminous resin layer formed from the luminous resin ink according to any one of <1> to <12>. <14> A light-emitting device comprising the optical member according to <13>. <15> A power generating device comprising the optical member according to <13>. <16> A display comprising the optical member according to <13>. <17> A method for producing the luminous resin ink according to any one of <1> to <12>, comprising: a first step of obtaining a dispersion containing the luminous nanoparticles and the first solvent, a second step of obtaining a resin solution containing the resin and the second solvent, and a third step of mixing the dispersion and the resin solution. <18> A method for producing the luminous resin ink according to any one of <1> to <12>, comprising: a first step of obtaining a dispersion containing the luminous nanoparticles and the first solvent, and a fourth step of mixing the dispersion and the resin. <19> The method for producing a luminescent resin ink according to <17> or <18>, wherein the first step comprises: a fifth step of mixing a precursor solution containing a precursor of the luminescent nanoparticles, a ligand, and a non-polar solvent at a liquid temperature of 40°C or less to prepare a suspension, and recovering a solid content by settling and separating the suspension; and a sixth step of dispersing the solid content in the first solvent and then classifying the solid content to remove coarse powder. <20> The method for producing an optical member according to <13>, comprising: a seventh step of forming a coating layer on a substrate using the luminescent resin ink; and an eighth step of solidifying the coating layer to obtain the luminescent resin layer.

[0008] According to the present invention, a luminous resin ink exhibiting good PLQY can be provided. Furthermore, by using the luminous nanoink, optical components exhibiting good PLQY, as well as light-emitting devices, power generation devices, and displays using the optical components, can be provided. Furthermore, the present invention can produce a luminous resin ink while suppressing a decrease in PLQY. Furthermore, by using the luminous resin ink, optical components exhibiting good PLQY can be produced.

[0009] The present invention will be described in detail below with reference to embodiments and examples. However, the present invention is not limited to the embodiments and examples shown below, and can be implemented with any modifications within the scope of the claims of the present invention and their equivalents. The components of the embodiments shown below can be combined as appropriate.

[0010] In the following description, the term "solvent" refers to a medium that dissolves or disperses solids.

[0011] 1. Overview of Luminous Resin Ink A luminous resin ink according to one embodiment of the present invention contains at least a dispersion liquid containing luminous nanoparticles and a first solvent, and a resin. This luminous resin ink has a liquid dielectric constant ε １ (μS / cm), and the liquid dielectric constant ε of the luminescent resin ink ２ (μS / cm) satisfies the following formula (1).

[0012] |(ε ２ -ε １ ) / ε １ | × 100 ≦ 10 (%) (1)

[0013] In equation (1), ２ -ε １ ) / ε １ |×100" represents the rate of variation of the liquid dielectric constant of the luminous resin ink relative to the liquid dielectric constant of the dispersion liquid.

[0014] According to this embodiment, the variability of the liquid dielectric constant of the luminescent resin ink relative to the liquid dielectric constant of the dispersion liquid is small, so that the luminescent resin ink can have a good photoluminescence quantum yield (PLQY).

[0015] Although it is not clear how a luminous resin ink having a good PLQY can be obtained by having a small variation rate of the liquid dielectric constant of the luminous resin ink relative to the liquid dielectric constant of the dispersion liquid, the inventors speculate that it may be as follows, although the technical scope of the present invention is not limited to the mechanism shown below.

[0016] Luminescent nanoparticles can emit light due to their fine particle size. In the production of articles containing such luminescent nanoparticles, the luminescent nanoparticles are usually treated as a dispersion in which the luminescent nanoparticles are dispersed in a solvent from the viewpoint of handling. In addition, in order to increase the PLQY of an article using such a dispersion, it is required to increase the PLQY of the dispersion itself, and specifically, it is required that the luminescent nanoparticles are uniformly dispersed in the dispersion.

[0017] However, the inventors speculate that when a dispersion liquid with high dispersibility of luminescent nanoparticles is mixed with a resin to form an ink, if the liquid dielectric constant of the luminescent resin ink changes significantly from that of the dispersion liquid, the electrical environment within the system will change, causing the luminescent nanoparticles to aggregate and be unable to maintain their dispersibility, resulting in a decrease in PLQY.

[0018] In contrast, in this embodiment, the variation rate of the liquid dielectric constant of the luminescent resin ink relative to the liquid dielectric constant of the dispersion can be reduced, so that even when the dispersion and resin are mixed in the luminescent resin ink, the change in the electrical environment within the system can be reduced and the dispersibility of the luminescent nanoparticles in the dispersion can be maintained, thereby suppressing the decrease in PLQY, and the inventors infer that as a result, a luminescent resin ink with good PLQY can be produced.

[0019] <2. Variation Rate of Liquid Dielectric Constant in Luminous Resin Ink> The luminous resin ink according to this embodiment contains at least a dispersion liquid containing luminous nanoparticles and a first solvent, and a resin, and the liquid dielectric constant ε １ (μS / cm), and the liquid dielectric constant ε of the luminescent resin ink ２ (μS / cm) satisfies the following formula (1).

[0020] |(ε２ -ε １ ) / ε １ | × 100 ≦ 10 (%) (1)

[0021] In equation (1), ２ -ε １ ) / ε １ |×100" represents the rate of variation of the liquid dielectric constant of the luminescent resin ink with respect to the liquid dielectric constant of the dispersion liquid. ２ -ε １ ) represents the amount of variation in the liquid dielectric constant of the luminescent resin ink relative to the liquid dielectric constant of the dispersion.

[0022] The fluctuation rate in equation (1) "|(ε ２ -ε １ ) / ε １ |×100" is usually 10% or less, preferably 8% or less, more preferably 5% or less, and ideally 0%. When the fluctuation rate is equal to or less than the upper limit, a luminous resin ink with good PLQY can be obtained.

[0023] In this embodiment, the liquid dielectric constant ε of the dispersion liquid １ (μS / cm), and the liquid dielectric constant ε of the luminescent resin ink ２ (μS / cm) preferably satisfies the following formula (2):

[0024] |ε ２ -ε １ |≦0.25 (μS / cm) (2)

[0025] Liquid dielectric constant ε of the dispersion １ (μS / cm), and the liquid dielectric constant ε of the luminescent resin ink ２ (μS / cm) satisfies formula (2), i.e., the absolute value of the variation in the liquid dielectric constant of the luminescent resin ink relative to the liquid dielectric constant of the dispersion is equal to or less than a predetermined value, the variation rate in formula (1) can be reduced, and a luminescent resin ink with good PLQY can be obtained.

[0026] The absolute value of the fluctuation amount "|ε ２ -ε １|" is usually 0.25 μS / cm or less, preferably 0.20 μS / cm or less, more preferably 0.15 μS / cm or less, and ideally 0 μS / cm.

[0027] In the luminous resin ink according to this embodiment, the fluctuation rate "|(ε ２ -ε １ ) / ε １ |×100" can usually be adjusted by the components of the luminescent resin ink. This luminescent resin ink preferably satisfies the following formula (3') or (4'), and more preferably satisfies formula (3) or (4). This is because a luminescent resin ink with good PLQY can be easily prepared.

[0028] For example, when the luminous resin ink contains a dispersion liquid and a resin solution containing a resin and a second solvent at a predetermined ratio, the liquid dielectric constant ε of the dispersion liquid is usually １ (μS / cm) and the liquid dielectric constant ε of the resin solution ３ The weighted average value of the liquid dielectric constant ε (μS / cm) of the luminous resin ink is ２ Therefore, in this case, the luminous resin ink according to this embodiment can be regarded as having a liquid dielectric constant ε １ (μS / cm) and the liquid dielectric constant ε of the resin solution ３ (μS / cm) can satisfy the following formula (3′).

[0029] |{(ε １ ×p / 100+ε ３ ×q / 100)-ε １} / ε １ |×100≦10(%) (3′) (In formula (3′), p is the weight-based content ratio (wt %) of the dispersion liquid to the luminous resin ink, q is the weight-based content ratio (wt %) of the resin solution to the luminous resin ink, and 90<(p+q)≦100 (wt %).)

[0030] In addition, the liquid dielectric constant ε １ (μS / cm) can usually be regarded as the same as the liquid dielectric constant of the solvent contained in the dispersion. Therefore, when the dispersion contains the first solvent as the main solvent, the liquid dielectric constant ε of the first solvent can be regarded as the same as the liquid dielectric constant ε of the first solvent. １１ (μS / cm) is the liquid dielectric constant ε of the dispersion１ (μS / cm).

[0031] Therefore, when the luminescent resin ink satisfies the above-mentioned formula (3') and further, the dispersion liquid contains a first solvent as the main solvent, the liquid dielectric constant of the first solvent and the liquid dielectric constant of the resin solution can satisfy the following formula (3).

[0032] |{(ε １１ ×p / 100+ε ３ ×q / 100)-ε １１} / ε １１ |×100≦10(%) (3) (In formula (3), p is the weight-based content ratio (wt%) of the dispersion liquid to the luminous resin ink, q is the weight-based content ratio (wt%) of the resin solution to the luminous resin ink, and 90<(p+q)≦100 (wt%).)

[0033] In formula (3) and formula (3'), the content ratio p of the dispersion liquid relative to the luminous resin ink is usually 10% by weight or less, more preferably 5% by weight or less, and more preferably 3% by weight or less. Furthermore, p is usually greater than 0% by weight, preferably 0.05% by weight or more, and more preferably 0.1% by weight or more. In other words, p satisfies the relationship 0% by weight < p ≦ 10% by weight.

[0034] In addition, in formula (3) and formula (3'), the content ratio q of the resin solution relative to the luminous resin ink is usually 90% by weight or more, preferably 95% by weight or more, and more preferably 98% by weight or more. That is, q satisfies the relationship 90 (weight %)≦q<100 (weight %).

[0035] Furthermore, in formula (3) and formula (3'), the sum (p + q) of the content ratio p of the dispersion liquid and the content ratio q of the resin solution is usually greater than 90% by weight, preferably 95% by weight or more, more preferably 98% by weight or more, and usually 100% by weight or less. Furthermore, the sum (p + q) is preferably 100% by weight.

[0036] The luminous resin ink satisfying the formula (3) and the formula (3′) can usually be produced by mixing a dispersion liquid with a resin solution. ３is usually the dielectric constant of the resin and the second solvent (liquid dielectric constant ε ３１ and the relative dielectric constant ε of the resin ３２ ) and the amount of each component in the resin solution, and can be adjusted by combining the resin and the second solvent. Therefore, when the luminescent resin ink satisfies the formula (3'), and when the formula (3') and the formula (3) are satisfied, the relative dielectric constant ε of the resin contained in the resin solution can be adjusted. ３２ may or may not satisfy the formula (4') described later.

[0037] Furthermore, for example, when the luminous resin ink according to this embodiment contains a dispersion liquid and a resin at a predetermined ratio, the liquid dielectric constant ε １ (μS / cm) and the relative dielectric constant ε of the resin ４ The weighted average value of the liquid dielectric constant ε (μS / cm) of the luminous resin ink is ２ Therefore, in this case, the luminous resin ink according to this embodiment can be regarded as having a liquid dielectric constant ε １ (μS / cm) and the relative dielectric constant ε of the resin ４ (μS / cm) can satisfy the following formula (4′).

[0038] |{(ε １ ×p / 100+ε ４ × r / 100) - ε １} / ε １ |×100≦10(%) (4′)

[0039] (In formula (4'), p is the weight-based content ratio (wt%) of the dispersion liquid relative to the luminous resin ink, and r is the weight-based content ratio (wt%) of the resin relative to the luminous resin ink, and 90<(p+r)≦100 (wt%).)

[0040] Furthermore, as described above, when the dispersion contains the first solvent as the main solvent, the liquid dielectric constant ε １１ (μS / cm) is the liquid dielectric constant ε of the dispersion １ Therefore, when the luminous resin ink satisfies the above-mentioned formula (4') and further contains the first solvent as the main solvent of the dispersion liquid, the liquid dielectric constant ε of the first solvent can be considered as １１ (μS / cm) and the relative dielectric constant ε of the resin４ (μS / cm) can satisfy the following formula (4).

[0041] |{(ε １１ ×p / 100+ε ４ × r / 100) - ε １１} / ε １１ |×100≦10(%) (4) (In formula (4), p is the weight-based content ratio (wt%) of the dispersion liquid to the luminous resin ink, r is the weight-based content ratio (wt%) of the resin to the luminous resin ink, and 90<(p+r)≦100 (wt%).)

[0042] In addition, in formula (4) and formula (4'), the content ratio p of the dispersion liquid relative to the luminous resin ink can range from usually 40% by weight or more, preferably 50% by weight or more, and more preferably 60% by weight or more, and is usually less than 100% by weight. That is, p can satisfy the relationship 40 (weight %)≦p<100 (weight %).

[0043] In addition, in formulas (4) and (4'), the content ratio r of the resin in the luminous resin ink is usually 60% by weight or less, preferably 50% by weight or less, and more preferably 40% by weight or less, and is usually greater than 0% by weight. That is, r satisfies the relationship 0 (weight %) < r ≦ 60 (weight %).

[0044] Furthermore, in formula (4) and formula (4'), the sum (p+r) of the dispersion content p and the resin content r is usually greater than 90% by weight, preferably 95% by weight or more, more preferably 98% by weight or more, and usually 100% by weight or less. The sum (p+r) is preferably 100% by weight.

[0045] A luminous resin ink satisfying the formula (4) and the formula (4') can usually be produced by directly mixing the dispersion liquid and the resin. Here, "directly" mixing the resin and the dispersion liquid means that the resin is mixed into the dispersion liquid without being mixed with a second solvent. In this case, the resin is usually dissolved in the first solvent of the dispersion liquid. That is, the relative dielectric constant ε of the resin in the formula (4) and the formula (4') ４ (μS / cm) is usually the relative dielectric constant of the resin mixed directly into the dispersion.

[0046] In the formula (3′), “|{(ε １ ×p / 100+ε ３ ×q / 100)-ε １} / ε １ |×100”, and “|{(ε １１ ×p / 100+ε ３ ×q / 100)-ε １１} / ε １１ |×100”, and “|{(ε １ ×p / 100+ε ４ × r / 100) - ε １} / ε １ |×100" and "|{(ε １１ ×p / 100+ε ４ × r / 100) - ε １１} / ε １１ The fluctuation rate represented by "|×100" is usually 10% or less, preferably 8% or less, more preferably 5% or less, and ideally 0%. When the fluctuation rate is equal to or less than the upper limit, a luminous resin ink with good PLQY can be obtained.

[0047] Liquid dielectric constant ε of the dispersion １ , the liquid dielectric constant ε of the luminescent resin ink ２ , the liquid dielectric constant of the resin solution ε ３ , the liquid dielectric constant ε of the first solvent １１ and the relative dielectric constant ε of the resin ４ can be appropriately selected from the range of usually 1.8 μS / cm or more and 2.8 μS / cm or less, preferably 1.9 μS / cm or more and 2.7 μS / cm or less, and more preferably 2.0 μS / cm or more and 2.6 μS / cm or less.

[0048] Liquid dielectric constant ε of the dispersion １ , the liquid dielectric constant ε of the luminescent resin ink ２ , the liquid dielectric constant of the resin solution ε ３ and the liquid dielectric constant ε of the first solvent １１ can be measured using a liquid dielectric constant meter (for example, Model 871 manufactured by Sanyo Trading Co., Ltd.) at a frequency of 10 kHz and 23° C. The relative dielectric constant ε of the resin ４The relative dielectric constant of the resin can be measured by a method in accordance with IEC 250, and can be measured at 23° C. using a known measuring device (for example, precision LCR meter HP4284A).

[0049] In the luminous resin ink according to this embodiment, the fluctuation rate "|(ε ２ -ε １ ) / ε １ |×100" can be adjusted, for example, by including a liquid dielectric constant adjuster in addition to the dispersion liquid and resin as components of the luminous resin ink.

[0050] 3. Composition of Luminous Resin Ink The luminous resin ink according to this embodiment contains at least a dispersion liquid containing luminous nanoparticles and a first solvent, and a resin.

[0051] 3.1. Dispersion The dispersion contains at least luminescent nanoparticles and a first solvent.

[0052] The first solvent that the dispersion liquid may contain is not limited as long as it is a solvent that can disperse luminescent nanoparticles, and typically, an organic solvent with a liquid dielectric constant of 2.8 μS / cm or less is used. Specific examples include pentane (1.84 μS / cm), hexane (1.88 μS / cm), octane (1.94 μS / cm), cyclohexane (2.02 μS / cm), methylcyclohexane (2.02 μS / cm), decalin (2.43 μS / cm), isooctane (1.94 μS / cm), benzene (2.28 μS / cm), toluene (2.38 μS / cm), xylene (2.58 μS / cm (25°C)), and mesitylene (2.28 μS / cm). Preferred are toluene, cyclohexane, methylcyclohexane, and decalin, which are alicyclic hydrocarbon compounds having a liquid dielectric constant of 2.0 μS / cm or more and 2.6 μS / cm or less, and more preferred are toluene, cyclohexane, and methylcyclohexane, which are alicyclic hydrocarbon compounds having a liquid dielectric constant of 2.0 μS / cm or more and 2.5 μS / cm or less. These first solvents may be used alone or in combination of two or more in any ratio as long as the liquid dielectric constant after mixing is 2.8 μS / cm or less.

[0053] The dispersion may contain a solvent other than the first solvent, if necessary. Examples of such a solvent include the polar solvents and non-polar solvents used to obtain the dispersion, which will be described later.

[0054] The weight ratio of the first solvent to all solvents contained in the dispersion is usually 90% by weight or more, preferably 95% by weight or more, and more preferably 99% by weight or more. The weight ratio of the first solvent to all solvents contained in the dispersion medium may be 100% by weight.

[0055] The luminescent nanoparticles that can be contained in the dispersion liquid are nano-sized particles that function as phosphors, absorbing light of a specific wavelength as excitation light and emitting fluorescence of another wavelength.

[0056] The luminescent nanoparticles that can be used in this embodiment are typically quantum dot particles. Quantum dot particles are nano-sized semiconductor materials that exhibit a quantum effect by confining electrons within the quantum dots. Furthermore, quantum dot particles function as phosphors, absorbing light of a specific wavelength as excitation light and emitting fluorescence of a different wavelength. In quantum dot particles, excitons (electrons) generated by light absorption are confined within nano-sized regions, resulting in a quantum effect in which the movement of the excitons is restricted and the energy levels become discrete. Furthermore, the band gap varies depending on the particle diameter of the quantum dot particles. Therefore, quantum dot particles have the property of being able to change the wavelength of fluorescent light depending on the particle diameter.

[0057] The quantum dot particles used in this embodiment may have an excitation light wavelength of, for example, 300 nm to 800 nm, and the quantum dot particles may have a fluorescence wavelength in the visible light region (for example, 400 nm to 750 nm).

[0058] The quantum dot particles according to this embodiment preferably have a perovskite crystal structure. The "perovskite crystal structure" is a type of crystal structure, and is a perovskite (CaTiO ３) refers to a crystal structure that is the same as that of the perovskite crystal structure. For example, if each site of the crystal structure is A', B', and X', ideally, the perovskite crystal structure has a cubic unit cell, with A' located at each vertex of the cubic crystal, B' located at the body center, and X' located at the face center of the cubic crystal, with B' at the center. Such a structure can be expressed by the formula A'B'X' ３ This becomes:

[0059] As quantum dot particles having a perovskite crystal structure (perovskite quantum dot particles), for example, a material represented by the following composition formula (A) is preferred. The material represented by the following composition formula (A) is also called metal halide perovskite particles. A （ｓ＋ａ） B （ｔ＋ｂ） X （ｕ＋ｃ） (A) (In the composition formula (A), A is a monovalent cation, B is a divalent metal ion, X is a monovalent anion, a is −0.2≦a≦0.2, b−0.2≦b≦0.2, c is −0.5≦a≦0.5, s is an integer of 1 or more and 4 or less, t is 1 or 2, u is an integer of 3 or more and 9 or less, and s+(2×t)=u is satisfied.)

[0060] In the formula (A), s represents an integer of 1 or more and 4 or less, t represents 1 or 2, and u represents an integer of 3 or more and 9 or less. s, t, and u satisfy the relationship s + (2 × t) = u. Preferably, s:t:u is a positive integer of 1:1:3, 4:1:6, or 2:1:4, and particularly preferably, s:t:u is 1:1:3.

[0061] In the composition formula (A), A is a monovalent cation. A is usually located at the A' site in the perovskite crystal structure. Examples of A include methylammonium (MA) ion, formamidinium (FA) ion, guanidium ion (GA), ethylammonium (EA) ion, cesium (Cs) ion, rubidium (Rb) ion, potassium (K) ion, and sodium (Na) ion. A may be of only one type, or may be of two or more types.

[0062] In the composition formula (A), B is a divalent metal ion. B is usually located at the B' site in the perovskite crystal structure. Examples of B include lead (Pb), tin (Sn), and germanium (Ge). In addition, antimony (Sb), bismuth (Bi), copper (Cu), nickel (Ni), cobalt (Co), iron (Fe), manganese (Mn), chromium (Cr), cadmium (Cd), europium (Eu), ytterbium (Yb), and silver (Ag) may be contained in an amount of 5% or less of the element ratio of lead (Pb), tin (Sn), and germanium (Ge).

[0063] In composition formula (A), X represents a monovalent anion, specifically a halogen ion. X is typically located at the X' site in the perovskite crystal structure. Examples of X include chlorine (Cl), bromine (Br), and iodine (I). In quantum dot particles represented by composition formula (A), the color of the fluorescent light emitted from the quantum dot particles can be adjusted by the anion of X. Specifically, quantum dot particles can exhibit blue fluorescence when chlorine (Cl) is used, green fluorescence when bromine (Br) is used, and red fluorescence when iodine (I) is used. Furthermore, monovalent pseudohalide ions such as cyanide, isothiocyanate, oxocyanate, thiocyanate, selenocyanate, sulfide, fulminate ion, azide ion, borohydride ion, and hexafluorophosphate ion may be contained within a range in which the element ratio of halide ions is 20% or less.

[0064] In the composition formula (A), a is usually -0.2≦a≦0.2, preferably -0.1≦a≦0.1, and ideally a=0. Furthermore, b is usually -0.2≦b≦0.2, preferably -0.1≦b≦0.1, and ideally b=0. Furthermore, c is -0.5≦c≦0.5, preferably -0.3≦c≦0.3, and ideally c=0. In this embodiment, in the composition formula (A), a=b=c=0 and s:t:u are 1:1:3, that is, the quantum dot particles are ABX ３ It is preferable that the composition be represented by the following formula:

[0065] More specifically, quantum dot particles include, for example, CsPbBr as a material that exhibits green fluorescence. ３ , MAPbBr ３ , FAPbBr ３ Furthermore, for example, CsPbCl is an example of a material that exhibits blue fluorescence. ３ , MAPbCl ３ and FAPbCl ３ Furthermore, for example, CsPbI is a material that exhibits red fluorescence. ３ , MAPbI ３ and FAPbI ３ By mixing X, intermediate colors can be reproduced. For example, CsPbBr is a material that exhibits yellow fluorescence. ２ I can be mentioned.

[0066] The fact that quantum dot particles have a perovskite crystal structure can be confirmed, for example, by a spectrum obtained by powder X-ray diffraction (XRD) measurement. Specifically, the presence of a perovskite crystal structure can be confirmed by the presence of peaks in the spectrum of quantum dot particles having a known perovskite crystal structure. For example, when quantum dot particles FA, Pb, and Br are included, whether or not they have a perovskite crystal structure can be confirmed by whether or not they have peaks at 2θ = 14.7 °, 21.4 °, 29.8 °, 33.3 °, 42.6 °, and 45.4 ° in powder X-ray diffraction using CuKα radiation. Each peak position may include an error of, for example, ±0.5 °.

[0067] The average particle size of the quantum dot particles can be appropriately selected depending on the desired fluorescent color, but is usually 1 nm or more, preferably 2 nm or more, more preferably 4 nm or more, and is usually 30 nm or less, preferably 20 nm or less, more preferably 16 nm or less.

[0068] The average particle size of the quantum dot particles can be determined by observing the quantum dot material with a transmission electron microscope (TEM), measuring the sizes of 30 particles at random, and calculating the arithmetic mean value of the measurement results.

[0069] Of the quantum dot particles described above, the luminescent nanoparticles that can be used in this embodiment are preferably metal halide perovskite particles having an average particle size of 1 nm or more and 30 nm or less.

[0070] The amount (mg) of luminescent nanoparticles contained in 1 mL of the dispersion is usually 1 mg / mL or more, preferably 1.5 mg / mL or more, more preferably 2 mg / mL or more, and can be usually 20 mg / mL or less, preferably 18 mg / mL or more, more preferably 15 mg / mL or less. This is because the content of the luminescent nanoparticles in the above range allows the luminescent nanoparticles to be well dispersed in the dispersion.

[0071] The content of the dispersion liquid in the luminous resin ink is not limited and can be selected appropriately depending on the application of the luminous resin ink, but preferably, the content of the dispersion liquid is 10 parts by weight or less, more preferably 8 parts by weight or less, even more preferably 5 parts by weight or less, and preferably 0.1 parts by weight or more, preferably 0.5 parts by weight or more, and more preferably 1 part by weight or more, relative to 100 parts by weight of the luminous resin ink. This is because, when the content of the dispersion liquid in the luminous resin ink is within the above range, the luminous resin ink can have good PLQY.

[0072] The dispersion liquid contains at least luminescent nanoparticles and a first solvent, and may contain optional components as needed. The optional components include, for example, compounds that can be used as ligands when producing luminescent nanoparticles. Compounds that can be used as ligands will be described later.

[0073] 3.2. Resin and Resin Solution The luminescent resin ink contains a resin. The resin can be mixed with the dispersion liquid as a resin solution containing the resin and a second solvent, or the resin can be mixed directly with the dispersion liquid. Here, "directly" mixing the resin with the dispersion liquid means that the resin is mixed with the dispersion liquid without being mixed with a second solvent. In the latter case, the resin is usually dissolved in the first solvent of the dispersion liquid.

[0074] When the luminous resin ink contains a resin solution containing a resin and a second solvent, the second solvent preferably has a liquid dielectric constant close to that of the first solvent. Specifically, the liquid dielectric constant of the second solvent is preferably within a range of ±10% of the liquid dielectric constant of the first solvent (i.e., a range of −10% to +10% of the liquid dielectric constant of the first solvent), more preferably within a range of ±5% of the liquid dielectric constant of the first solvent (i.e., a range of −5% to +5% of the liquid dielectric constant of the first solvent), and even more preferably within a range of ±3% of the liquid dielectric constant of the first solvent (i.e., a range of −3% to +3% of the liquid dielectric constant of the first solvent). This is because the variation rate represented by the above-mentioned formula (1) can be reduced, resulting in a luminous resin ink with good PLQY.

[0075] The second solvent is selected appropriately depending on the solubility of the resin, but it is more preferable to use the same solvent as the first solvent described above, because this can reduce the fluctuation rate represented by the above formula (1), thereby making it possible to obtain a luminescent resin ink with good PLQY.

[0076] Specific examples of solvents that can be used as the second solvent may be the same as specific examples of solvents that can be used as the first solvent.

[0077] Furthermore, the resin that can be contained in the resin solution is not particularly limited, but it is preferable that the liquid dielectric constant of the first solvent and the relative dielectric constant of the resin are close to each other. Specifically, the relative dielectric constant of the resin is within the range of ±10% of the liquid dielectric constant of the first solvent (i.e., the range of −10% to +10% of the liquid dielectric constant of the first solvent), preferably within the range of ±5% of the liquid dielectric constant of the first solvent (i.e., the range of −5% to +5% of the liquid dielectric constant of the first solvent), and more preferably within the range of ±3% of the liquid dielectric constant of the first solvent (i.e., the range of −3% to +3% of the liquid dielectric constant of the first solvent).

[0078] The resin that can be contained in the luminescent resin ink can be appropriately selected depending on the application of the luminescent resin ink, and typically includes thermoplastic resins and curable resins, with thermoplastic resins being preferred.

[0079] Examples of thermoplastic resins include acetate resins such as triacetyl cellulose, polyester resins, polyethersulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, cyclic olefin resins, and (meth)acrylic resins. The term "(meth)acrylic resin" includes acrylic resins, methacrylic resins, and combinations thereof. In this embodiment, olefin resins such as polyolefin resins and cyclic olefin resins are particularly preferred. This is because a luminous resin ink with good atmospheric stability can be obtained.

[0080] Olefin resins usually contain olefin polymers. The olefin polymers may be polymers obtainable by polymerizing olefin monomers or hydrogenated products thereof. The olefin polymers may be homopolymers or copolymers, or may be hydrogenated copolymers. Examples of olefin polymers include linear olefin polymers, which are polymers containing linear olefin units; and cyclic olefin polymers containing cyclic olefin monomer units. Of these, cyclic olefin polymers are preferred as the olefin polymers because they have high heat resistance and excellent moisture absorption. Cyclic olefin polymers are also called cycloolefin polymers.

[0081] The cyclic olefin polymer may have a cyclic structure in its molecule. Usually, the cyclic olefin polymer has an alicyclic structure in the repeating unit of the polymer. The cyclic olefin polymer may be a polymer having an alicyclic structure in the main chain, a polymer having an alicyclic structure in the side chain, a polymer having alicyclic structures in the main chain and the side chain, or a mixture of two or more of these in any ratio. From the viewpoints of mechanical strength, heat resistance, etc., the cyclic olefin polymer is preferably a polymer containing an alicyclic structure in the main chain.

[0082] Examples of the alicyclic structure include saturated alicyclic hydrocarbon (cycloalkane) structures, unsaturated alicyclic hydrocarbon (cycloalkene, cycloalkyne) structures, etc. Among these, from the viewpoints of mechanical strength, heat resistance, etc., cycloalkane structures and cycloalkene structures are preferred, and cycloalkane structures are particularly preferred.

[0083] The number of carbon atoms constituting the alicyclic structure is preferably 4 or more, more preferably 5 or more, per one alicyclic structure, and is preferably 30 or less, more preferably 20 or less, particularly preferably 15 or less, which is suitable because it provides a high balance of mechanical strength, heat resistance, and formability of the base layer.

[0084] In the cyclic olefin polymer, the ratio of the structural units having an alicyclic structure to all structural units can be appropriately selected depending on the intended use. Such a ratio is preferably 55% by weight or more, more preferably 70% by weight or more, and even more preferably 90% by weight or more. A ratio of the structural units having an alicyclic structure to all structural units within this range is preferred from the viewpoint of the transparency and heat resistance of the base layer.

[0085] Examples of cyclic olefin polymers include norbornene polymers, monocyclic olefin polymers, cyclic conjugated diene polymers, vinyl alicyclic hydrocarbon polymers, and hydrogenated products thereof, and hydrogenated vinyl aromatic hydrocarbon polymers. Among these, one or more selected from the group consisting of norbornene polymers, vinyl alicyclic hydrocarbon polymers, and hydrogenated vinyl aromatic hydrocarbon polymers are more preferred because of their good transparency.

[0086] Examples of norbornene-based polymers include ring-opening polymers of monomers having a norbornene structure and their hydrogenated products; addition polymers of monomers having a norbornene structure and their hydrogenated products.In addition, examples of ring-opening polymers of monomers having a norbornene structure include ring-opening homopolymers of one type of monomer having a norbornene structure, ring-opening copolymers of two or more types of monomers having a norbornene structure, and ring-opening copolymers of a monomer having a norbornene structure and any monomer copolymerizable therewith.In addition, examples of addition polymers of monomers having a norbornene structure include addition homopolymers of one type of monomer having a norbornene structure, addition copolymers of two or more types of monomers having a norbornene structure, and addition copolymers of a monomer having a norbornene structure and any monomer copolymerizable therewith. Among these, hydrogenated ring-opening copolymers of monomers having a norbornene structure, addition copolymers of monomers having a norbornene structure and α-olefins, and hydrogenated copolymers of addition copolymers of monomers having a norbornene structure and α-olefins are preferred, and hydrogenated ring-opening copolymers of two or more monomers having a norbornene structure, addition copolymers of monomers having a norbornene structure and α-olefins, and hydrogenated copolymers of addition copolymers of monomers having a norbornene structure and α-olefins are more preferred.

[0087] Examples of monomers having a norbornene structure include bicyclo[2.2.1]hept-2-ene (common name: norbornene), tricyclo[4.3.0.1]hept-2-ene, and the like. ２，５ ]deca-3,7-diene (common name: dicyclopentadiene), 7,8-benzotricyclo[4.3.0.1 ２，５ ]dec-3-ene (common name: methanotetrahydrofluorene), tetracyclo[4.4.0.1 ２，５ .1 ７，１０]dodec-3-ene (common name: tetracyclododecene), and derivatives of these compounds (for example, those having a substituent on the ring). Examples of the substituent include an alkyl group, an alkylene group, and a polar group. These substituents may be the same or different, and a plurality of them may be bonded to the ring. The monomer having a norbornene structure may be used alone or in combination of two or more kinds in any ratio.

[0088] Examples of the polar group include a heteroatom or an atomic group having a heteroatom. Examples of the heteroatom include an oxygen atom, a nitrogen atom, a sulfur atom, a silicon atom, and a halogen atom. Specific examples of the polar group include a carboxyl group, a carbonyloxycarbonyl group, an epoxy group, a hydroxyl group, an oxy group, an ester group, a silanol group, a silyl group, an amino group, a nitrile group, and a sulfonic acid group.

[0089] Examples of the monomer capable of ring-opening copolymerization with the monomer having a norbornene structure include monocyclic olefins such as cyclohexene, cycloheptene, cyclooctene, etc., and derivatives thereof; cyclic conjugated dienes such as cyclohexadiene, cycloheptadiene, etc., and derivatives thereof; etc. The monomer capable of ring-opening copolymerization with the monomer having a norbornene structure may be used alone or in combination of two or more types in any ratio.

[0090] A ring-opening polymer of a monomer having a norbornene structure can be produced, for example, by polymerizing or copolymerizing the monomer in the presence of a ring-opening polymerization catalyst.

[0091] In the addition copolymer of a monomer having a norbornene structure and an α-olefin, examples of the α-olefin include α-olefins having 2 to 20 carbon atoms, such as ethylene, propylene, and 1-butene, and derivatives thereof. Among these, ethylene is preferred. One type of α-olefin may be used alone, or two or more types may be used in combination in any ratio.

[0092] An addition polymer of a monomer having a norbornene structure can be produced, for example, by polymerizing or copolymerizing the monomer in the presence of an addition polymerization catalyst.

[0093] The hydrogenated products of the ring-opening polymer and the addition polymer described above can be produced, for example, by hydrogenating, preferably to 90% or more, the carbon-carbon unsaturated bonds in a solution of the ring-opening polymer and the addition polymer in the presence of a hydrogenation catalyst containing a transition metal such as nickel or palladium.

[0094] Examples of trade names of norbornene-based polymers include "ZEONOR" and "ZEONEX" manufactured by Zeon Corporation; "ARTON" manufactured by JSR Corporation; and "APEL" manufactured by Mitsui Chemicals, Inc.

[0095] Examples of vinyl alicyclic hydrocarbon polymers include polymers of vinyl alicyclic hydrocarbon monomers such as vinylcyclohexene and vinylcyclohexane, and hydrogenated products thereof; and hydrogenated products of aromatic ring moieties in polymers of vinyl aromatic monomers. Furthermore, the polymers may be copolymers of vinyl alicyclic hydrocarbon monomers or vinyl aromatic monomers with other monomers copolymerizable with these monomers. Examples of such copolymers include random copolymers and block copolymers. Examples of block copolymers include, but are not limited to, diblock copolymers, triblock copolymers, or higher-order multiblock copolymers and gradient block copolymers.

[0096] The vinyl alicyclic hydrocarbon polymer is preferably a hydrogenated vinyl aromatic hydrocarbon polymer. The vinyl aromatic hydrocarbon polymer refers to a polymer containing a repeating unit [I] derived from an aromatic vinyl compound. The repeating unit derived from an aromatic vinyl compound refers to a repeating unit having a structure obtained by polymerizing an aromatic vinyl compound. However, the polymer and its constituent units are not limited by their production method.

[0097] Examples of aromatic vinyl compounds corresponding to the repeating unit [I] include styrene; styrenes having an alkyl group having 1 to 6 carbon atoms as a substituent, such as α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-dimethylstyrene, 2,4-diisopropylstyrene, 4-t-butylstyrene, and 5-t-butyl-2-methylstyrene; styrenes having a halogen atom as a substituent, such as 4-chlorostyrene, dichlorostyrene, and 4-monofluorostyrene; styrenes having an alkoxy group having 1 to 6 carbon atoms as a substituent, such as 4-methoxystyrene; styrenes having an aryl group as a substituent, such as 4-phenylstyrene; and vinyl naphthalenes such as 1-vinylnaphthalene and 2-vinylnaphthalene. These may be used alone, or two or more may be used in combination in any ratio. Among these, aromatic vinyl compounds not containing a polar group, such as styrene and styrenes having an alkyl group having 1 to 6 carbon atoms as a substituent, are preferred because they can reduce hygroscopicity, and styrene is particularly preferred because of its ease of industrial availability.

[0098] The polymer containing the repeating unit [I] derived from an aromatic vinyl compound is preferably a specific block copolymer [D]. The block copolymer [D] is a block copolymer consisting of a polymer block [A] and a polymer block [B] or a polymer block [C]. The polymer block [A] is a polymer block mainly composed of the repeating unit [I] derived from an aromatic vinyl compound. The polymer block [B] is a polymer block mainly composed of the repeating unit [I] derived from an aromatic vinyl compound and the repeating unit [II] derived from a linear conjugated diene compound. The polymer block [C] is a polymer block mainly composed of the repeating unit [II] derived from a linear conjugated diene compound. Here, the term "main component" refers to a component that accounts for 50% by weight or more of the polymer block. The proportion of the main component in the polymer block is preferably 80% by weight or more, more preferably 90% by weight or more, and even more preferably 100% by weight. The repeating unit derived from a linear conjugated diene compound refers to a repeating unit having a structure obtained by polymerizing a linear conjugated diene compound.

[0099] Examples of the chain conjugated diene compound corresponding to the repeating unit [II] include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, and 1,3-pentadiene. These may be used alone or in combination of two or more in any ratio. The chain conjugated diene compound may be linear or branched.

[0100] The hydrogenated vinyl aromatic hydrocarbon polymer is a hydrogenated polymer containing a repeating unit [I] derived from an aromatic vinyl compound. The hydrogenated polymer containing a repeating unit [I] derived from an aromatic vinyl compound is preferably a specific hydrogenated block copolymer [E]. The hydrogenated block copolymer [E] is a hydrogenated block copolymer obtained by hydrogenating the aforementioned block copolymer [D].

[0101] A hydrogenated vinyl aromatic hydrocarbon polymer is a substance obtained by hydrogenating the unsaturated bonds of a vinyl aromatic hydrocarbon polymer. Here, the unsaturated bonds of the vinyl aromatic hydrocarbon polymer to be hydrogenated include both carbon-carbon unsaturated bonds in the main chain and side chains of the polymer and carbon-carbon unsaturated bonds in the aromatic rings.

[0102] The hydrogenated product can be produced, for example, by hydrogenating the unsaturated bonds of the polymer, preferably to 90% or more, in a solution of the vinyl aromatic hydrocarbon polymer in the presence of a hydrogenation catalyst containing a transition metal such as nickel or palladium.

[0103] Further examples of polymers that can be used as the cyclic olefin polymer include polymers containing silicon atom-containing polar groups. Examples of such polymers include the hydrogenated vinyl aromatic hydrocarbon polymers described above, modified with silicon atom-containing polar groups. By using a polymer containing a silicon atom-containing polar group as the olefin polymer, it is possible to improve the adhesion between a member using the luminescent resin ink and another member (e.g., a substrate).

[0104] Hereinafter, the polymer used in the reaction to obtain the modified product may be referred to as a "pre-reaction polymer" as appropriate. The modified product may have a structure obtained by, for example, reacting a pre-reaction polymer with a compound having a silicon atom-containing polar group as a monomer. The reaction may be, for example, a graft polymerization reaction. However, the modified product is not limited by its production method. The silicon atom-containing polar group is preferably an alkoxysilyl group.

[0105] Examples of compounds having a silicon atom-containing polar group that can be used as a monomer for graft polymerization include compounds having an alkoxysilyl group, such as vinyltrimethoxysilane, vinyltriethoxysilane, allyltrimethoxysilane, allyltriethoxysilane, dimethoxymethylvinylsilane, diethoxymethylvinylsilane, p-styryltrimethoxysilane, p-styryltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-acryloxypropyltriethoxysilane, and 2-norbornene-5-yltrimethoxysilane, and other ethylenically unsaturated silane compounds having an alkoxysilyl group.

[0106] By reacting a pre-reaction polymer with a compound having a silicon atom-containing polar group, a silicon atom-containing polar group can be introduced into the pre-reaction polymer, thereby obtaining a modified product having a silicon atom-containing polar group. When an alkoxysilyl group is introduced as the silicon atom-containing polar group, the amount of alkoxysilyl group introduced is preferably 0.1 parts by weight or more, more preferably 0.2 parts by weight or more, and even more preferably 0.3 parts by weight or more, relative to 100 parts by weight of the pre-reaction polymer, and is preferably 10 parts by weight or less, more preferably 5 parts by weight or less, and even more preferably 3 parts by weight or less. When the amount of alkoxysilyl group introduced falls within the above range, the degree of crosslinking between alkoxysilyl groups decomposed by water can be prevented from becoming excessively high, thereby maintaining high adhesiveness. Examples of substances having alkoxysilyl groups used to introduce alkoxysilyl groups and modification methods include those described in WO 2015 / 099079.

[0107] The amount of polar groups introduced is １ When measuring the amount of polar groups introduced, if the amount introduced is small, the number of integration times can be increased.

[0108] Introducing an alkoxysilyl group as a polar group into a pre-reaction polymer is called silane modification. In the silane modification, the alkoxysilyl group may be bonded directly to the pre-reaction polymer, or may be bonded via a divalent organic group such as an alkylene group. Hereinafter, the polymer obtained by silane modification of the pre-reaction polymer is also referred to as a "silane-modified polymer."

[0109] The silane-modified polymer is preferably one or more polymers selected from a silane-modified hydrogenated styrene-butadiene block copolymer, a silane-modified hydrogenated styrene-butadiene-styrene block copolymer, a silane-modified hydrogenated styrene-isoprene block copolymer, and a silane-modified hydrogenated styrene-isoprene-styrene block copolymer.

[0110] Preferred examples of the olefin polymer other than the cyclic olefin polymer include a polymer containing a repeating unit derived from a chain conjugated diene compound and a copolymer containing a repeating unit derived from a chain conjugated diene compound and other repeating units. More specific examples thereof include a polymer containing a repeating unit [I] derived from an aromatic vinyl compound, such as the block copolymer [D] described above.

[0111] The weight average molecular weight Mw of the olefin polymer is preferably 10,000 or more, more preferably 15,000 or more, particularly preferably 20,000 or more, and is preferably 100,000 or less, more preferably 80,000 or less, particularly preferably 50,000 or less. When the weight average molecular weight is within this range, the mechanical strength and moldability of the olefin polymer are well balanced.

[0112] The molecular weight distribution (Mw / Mn) of the olefin polymer is preferably 1.2 or more, more preferably 1.5 or more, particularly preferably 1.8 or more, and preferably 3.5 or less, more preferably 3.0 or less, particularly preferably 2.7 or less. Here, Mn represents the number average molecular weight. By making the molecular weight distribution equal to or greater than the lower limit of the above range, the productivity of the olefin polymer can be increased and production costs can be reduced. Furthermore, by making it equal to or less than the upper limit, the amount of low-molecular-weight components can be reduced. As a result, relaxation of a layer using the composition when exposed to high temperatures can be suppressed, thereby improving the stability of the layer.

[0113] The weight average molecular weight (Mw) and number average molecular weight (Mn) can be measured using gel permeation chromatography (GPC). Examples of solvents used in GPC include cyclohexane, toluene, and tetrahydrofuran. When using GPC, the weight average molecular weight is measured as a relative molecular weight, for example, in terms of polyisoprene or polystyrene.

[0114] The proportion of the olefin polymer in the olefin resin is preferably 50% by weight or more, more preferably 70% by weight or more, and particularly preferably 90% by weight or more. By making the proportion of the olefin resin equal to or greater than the lower limit, the luminescent nanoparticles can be stably retained in the member using the luminescent resin ink.

[0115] When the luminescent resin ink according to this embodiment contains a curable resin, the curable resin may be either a thermosetting resin or a photocurable resin, or a mixture thereof. Examples of thermosetting resins include isocyanate compounds, blocked isocyanate compounds, amino resins, benzoxazine resins, carbodiimide resins, cyclocarbonate compounds, epoxy compounds, polyfunctional oxetane compounds, and episulfide resins. Examples of photocurable resins include known photosensitive monomers such as acryloyl compounds, epoxy compounds, photopolymerizable oligomers, and photopolymerizable vinyl monomers. These photosensitive monomers may be either radically polymerizable or cationic polymerizable monomers. The curable resins may be used alone or in combination of two or more types in any ratio.

[0116] The amount of resin relative to 100 parts by weight of the luminescent resin ink is usually 10 parts by weight or more, preferably 15 parts by weight or more, more preferably 20 parts by weight or more, and is usually 99.99 parts by weight or less, preferably 70 parts by weight or less, more preferably 50 parts by weight or less. This is because the amount of resin in the above range can improve the atmospheric stability of the luminescent nanoparticles in the luminescent resin ink and in articles using the same.

[0117] 3.3. Optional Components As described above, the luminescent resin ink according to this embodiment contains a dispersion liquid and a resin, and may contain optional components selected appropriately as needed. Examples of optional components include a liquid dielectric constant adjuster, a radical scavenger, and an ultraviolet absorber.

[0118] An example of the liquid dielectric constant adjuster is 2-hydroxy-4-n-octyloxybenzophenone.

[0119] As the radical scavenger, for example, a hindered amine-based light stabilizer, a phenol-based light stabilizer, or a composite light stabilizer can be used.

[0120] Examples of the hindered amine light stabilizer include 2,2,6,6-tetramethyl-4-piperidyl methacrylate, 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate, bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis(2,2,6,6-tetramethyl-4-piperidyl-1-oxyl) sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, N,N'-bis(2,2,6,6-tetramethylpiperidin-4-yl)-hexane-1,6-diamine, N １ , N ３ -bis(2,2,6,6-tetramethylpiperidin-4-yl)-isophthalamine and bis(1,2,2,6,6-pentamethyl-4-piperidyl)butyl(3,5-di-tert-butyl-4-hydroxybenzyl)malonate.

[0121] Examples of phenolic light stabilizers include stearyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 6-tert-butyl-2,4-xylenol, 2,6-di-tert-butyl-p-cresol, 2,6-di-tert-butyl-4-ethylphenol, diethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate, 2,6-di-tert-butylphenol, 4,6-di-tert-butylresorcinol, hexadecyl 3,5-di-tert-butyl-4-hydroxybenzoate, 2-methyl-4-benzophenone, 2,6-di-tert-butyl-4-hydroxybenzoic acid ester ... 4,6-bis[(n-octylthio)methyl]phenol, 2,4-bis[(dodecylthio)methyl]-6-methylphenol, 2,2'-methylenebis(6-tert-butyl-4-ethylphenol), 4,4'-butylidenebis(6-tert-butyl-m-cresol), 2,5-di-tert-butylhydroquinone, 2,5-di-tert-amylhydroquinone, 2,5-bis(1,1,3,3-tetramethylbutyl)hydroquinone, 2,2'-methylenebis(6-cyclohexyl-p-cresol), 2,2'-methylenebis[6 -(1-methylcyclohexyl)-p-cresol], 4,4'-thiobis(6-tert-butyl-m-cresol), 3-(3,5-di-tert-butyl-4-hydroxyphenyl)-N'-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoyl]propanehydrazide, N,N'-hexamethylenebis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanamide], 2,4,8,10-tetraoxaspiro[5,5]undecane-3,9-diylbis(2-methylpropane-2,1-diyl ) bis[3-(3-tert-butyl)-4-hydroxy-5-methylphenylpropanoate], 2,4,6-tris(3',5'-di-tert-butyl-4'-hydroxybenzyl)mesitylene, tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 4,4'-dihydroxy-3,3',5,5'-tetraisopropylbiphenyl, 2,2',6,6'-tetra-tert-butyl-4,4'-Dihydroxybiphenyl, 4-[[4,6-bis(n-octylthio)-1,3,5-triazin-2-yl]amino]-2,6-di-tert-butylphenol, 3,5-di-tert-butyl-4-hydroxyanisole, 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid, 4-(hexyloxy)-2,3,6-trimethylphenol, methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 2,2'-methylene-bis(6-tert-butyl-4-methylphenol)acrylate, bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoic acid][oxalylbis(azanediyl)]bis(ethane-2,1-diyl), N,N'-bis[2-[2-(3,5-di-t tert-butyl-4-hydroxyphenyl)ethylcarbonyloxy]ethyl]oxamide, 3,3',5,5'-tetra-tert-butyl-4,4'-stilbenequinoline, bis[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionic acid][ethylenebis(oxyethylene)], 2,4,6-tris(2,4-dihydroxyphenyl)-1,3,5-triazine, 2,2'-methylene-bis(4-methyl-6-tert-butylphenol), 2,2'-methylene-bis(4-ethyl-6-tert-butylphenol), 2-methyl-4,6-bis[(octylthio)methyl]phenol, 2,4-bis(dodecylthiomethyl)-6-methylphenol, and 2,6-di-tert-butyl-4-methylphenol.

[0122] Examples of the composite light stabilizer include 1,2,2,6,6-pentamethyl-4-piperidinyl 3,5-bis(1,1-dimethylethyl)-4-hydroxybenzoate, 1,2,2,6,6-pentamethyl-4-piperidinyl 3,5-bis(1,1-dimethylethyl)-4-hydroxybenzenepropanoate, bis(1,2,2,6,6-pentamethyl-4-piperidyl)butyl(3,5-di-tert-butyl-4-hydroxybenzyl)malonate, 4,4'-butylidene-bis(6-tert-butyl-m-cresol), 4,4'-thiobis(6-tert-butyl-m-cresol), 2,2'-methylenestyrene-bis(4-methyl-6-tert-butylphenol), ), 2,2'-methylene-bis(4-ethyl-6-tert-butylphenol), 6,6'-di-tert-butyl-4,4'-butylidene-di-m-cresol), 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxybenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trione isocyanurate tris(3,5-di-tert-butyl-4-hydroxybenzyl)], and the like.

[0123] As the ultraviolet absorber, ultraviolet absorbers composed of organic compounds are preferred, and among them, at least one ultraviolet absorber selected from the group consisting of benzotriazole-based ultraviolet absorbers, triazine-based ultraviolet absorbers, and benzophenone-based ultraviolet absorbers is particularly preferred.

[0124] Examples of benzotriazole-based ultraviolet absorbers include 2,2'-methylenebis[4-(1,1,3,3-tetramethylbutyl)-6-(2H-benzotriazol-2-yl)phenol], 2-(3,5-di-tert-butyl-2-hydroxyphenyl)-5-chlorobenzotriazole, 2-(2H-benzotriazol-2-yl)-p-cresol, 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol, 2-benzotriazol-2-yl-4,6-di-tert-butylphenol, 2-[5-chloro(2H)-benzotriazol-2-yl]-4-methyl-6-(tert-butyl) 2-(2H-benzotriazol-2-yl)-4,6-di-tert-butylphenol, 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol, 2-(2H-benzotriazol-2-yl)-4-methyl-6-(3,4,5,6-tetrahydrophthalimidylmethyl)phenol, reaction products of methyl 3-(3-(2H-benzotriazol-2-yl)-5-tert-butyl-4-hydroxyphenyl)propionate / polyethylene glycol 300, 2-(2H-benzotriazol-2-yl)-6-(straight-chain and branched-chain dodecyl)-4-methylphenol, and the like. Examples of commercially available triazole ultraviolet absorbers include "ADEKA STAB LA-31" manufactured by ADEKA Corporation and "TINUVIN 329" manufactured by BASF.

[0125] Examples of triazine-based ultraviolet absorbers include 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol, 2,4-bis(2-hydroxy-4-butoxyphenyl)-6-(2,4-dibutoxyphenyl)-1,3,5-triazine, etc. Commercially available triazine-based ultraviolet absorbers include, for example, "Tinuvin 1577" manufactured by BASF.

[0126] Examples of benzophenone-based ultraviolet absorbers include 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone 2',4'-di-tert-butylphenyl-3,5-di-tert-4-hydroxybenzoate, etc. Commercially available products of such benzophenone-based ultraviolet absorbers include "Seesorb 712" manufactured by Shipro Chemical Co., Ltd.

[0127] 4. Viscosity of Luminous Resin Ink The luminous resin ink according to this embodiment can normally exist in a fluid liquid state at room temperature under atmospheric pressure.

[0128] The viscosity of the luminescent resin ink according to this embodiment can be selected appropriately depending on the application, but is usually 10 Pa s or less, preferably 5 Pa s or less, more preferably 1 Pa s or less, and is usually 0.001 Pa s or more, preferably 0.01 Pa s or more, more preferably Pa s or more. The viscosity of the luminescent resin ink within this range allows it to be easily processed into various articles.

[0129] The viscosity of the luminous resin ink can be measured in an environment of 25°C ± 2°C using a tuning fork vibration viscometer.

[0130] 5. Manufacturing Method of Luminous Resin Ink The luminous resin ink according to this embodiment can be manufactured by any manufacturing method. In this embodiment, for example, when the luminous resin ink contains a dispersion liquid and a resin solution, the manufacturing method preferably includes the following first to third steps.

[0131] First step: obtaining a dispersion containing luminescent nanoparticles and the first solvent. Second step: obtaining a resin solution containing a resin and the second solvent. Third step: mixing the dispersion and the resin solution.

[0132] In the present embodiment, for example, when the luminous resin ink contains a dispersion liquid and a resin, the manufacturing method preferably includes the following first and fourth steps.

[0133] First step: obtaining a dispersion containing luminescent nanoparticles and the first solvent. Fourth step: mixing the dispersion with the resin.

[0134] Hereinafter, the manufacturing method including the first to third steps will be described as a manufacturing method of a first embodiment, and the manufacturing method including the first and fourth steps will be described as a manufacturing method of a second embodiment.

[0135] 5.1. Manufacturing Method of First Embodiment The manufacturing method of the luminous resin ink of the first embodiment includes at least the above-described first to third steps. In the manufacturing method of the first embodiment, the liquid dielectric constant ε of the dispersion liquid obtained in the first step １ (μS / cm) and the liquid dielectric constant ε of the resin solution obtained in the second step ３ (μS / cm) preferably satisfies the above-mentioned formula (3′), and in that case, the liquid dielectric constant ε of the first solvent contained in the dispersion liquid １１ (μS / cm) and the liquid dielectric constant ε of the resin solution ３ It is more preferable that (μS / cm) satisfies the above-mentioned formula (3).

[0136] (Step 1: Step of Obtaining a Dispersion) Step 1 is a step of obtaining a dispersion containing luminescent nanoparticles and a first solvent. The method for obtaining the dispersion is not limited, but preferably includes a fifth step of preparing a suspension by mixing a precursor solution containing a precursor of the luminescent nanoparticles, a ligand, and a non-polar solvent at a liquid temperature of 40°C or less, and recovering solids by settling and separating the suspension, and a sixth step of dispersing the solids in the first solvent and then classifying the solids to remove coarse particles. The method including steps 5 and 6 is usually known as the LARP method (ligand-assisted reprecipitation method).

[0137] The precursor solution used in step 5 typically contains raw materials for the luminescent nanoparticles and a polar solvent.

[0138] As a raw material for the luminescent nanoparticles, for example, when the luminescent nanoparticles are metal halide perovskite particles, the raw material for the luminescent nanoparticles may be a compound represented by the above-mentioned composition formula (A) (A （ｓ＋ａ） B （ｔ＋ｂ） X （ｕ＋ｃ）) compounds containing the chemical species A, B and X in

[0139] The polar solvent may be any solvent that has high solubility in the metal halide perovskite precursor, organic base compounds, and organic acid compounds, and typically is a polar solvent that is miscible with the first solvent described above and the nonpolar solvent described below. Aprotic organic solvents with a liquid dielectric constant of 30 μS / cm or more are particularly preferred, and specific examples include N,N-dimethylformamide (DMF, 38 μS / cm), N-methylpyrrolidone (NMP, 32 μS / cm), 4-butanolide (GBL, 43 μS / cm), dimethyl sulfoxide (DMSO, 47 μS / cm), propylene carbonate (PC, 64 μS / cm), and acetonitrile (37 μS / cm).

[0140] The non-polar solvent is preferably an organic solvent having a liquid dielectric constant of 10 μS / cm or less. Specific examples include pentane (1.84 μS / cm), hexane (1.88 μS / cm), cyclohexane (2.02 μS / cm), octane (2.00 μS / cm), decalin (2.43 μS / cm), methylcyclohexane (2.02 μS / cm), xylene (2.58 μS / cm), ethyl methyl carbonate (EMC, 2.92 μS / cm), dimethyl carbonate (DMC, 3.03 μS / cm), diethyl carbonate (DEC, 2.82 μS / cm), and propylene glycol monomethyl ether acetate (PMA, 8.03 μS / cm). Examples include ethyl acetate (6.02 μS / cm), methyl acetate (6.65 μS / cm), chloroform (4.92 μS / cm), chlorobenzene (5.65 μS / cm), toluene (2.38 μS / cm), benzene (2.28 μS / cm (25°C)), dichloromethane (8.90 μS / cm), diethyl ether (4.10 μS / cm), dibutyl ether (3.06 μS / cm)), cyclopentyl methyl ether (CPME, 4.28 μS / cm), and tetrachloromethane (2.24 μS / cm). These may be used alone or in combination of two or more in any ratio as long as the liquid dielectric constant after mixing is 10 μS / cm or less.

[0141] The ligands may generally include at least one of an organic acid ligand and an organic base ligand, but preferably include both.

[0142] The organic acid ligand is a cation that forms the perovskite quantum dot particle, that is, a compound represented by the composition formula (A) (A （ｓ＋ａ） B （ｔ＋ｂ） X （ｕ＋ｃ） ) is a compound that forms a coordinate bond with A and B in the organic acid ligand. The organic acid ligand is a ligand selected from the group consisting of organic carboxylic acid compounds, organic sulfonic acid compounds, organic phosphonic acid compounds, organic phosphonate compounds, and organic phosphinic acid compounds. Specific examples of organic acid ligands include carboxylic acids such as oleic acid, stearic acid, palmitic acid, glutaric acid, sebacic acid, and benzoic acid; phosphorus oxoacid compounds such as octylphosphonic acid, tetradecylphosphonic acid, di-tert-octylphosphinic acid, tri-n-octylphosphine oxide, tetradecylphosphonic acid, and diisooxylphosphinic acid; and sulfinic acids such as benzenesulfinic acid. These compounds can be used alone or in combination of two or more in any ratio.

[0143] The organic base ligand is an anion that forms the perovskite quantum dot particle, that is, the organic base ligand is mainly an anion represented by the composition formula (A) (A （ｓ＋ａ） B （ｔ＋ｂ） X （ｕ＋ｃ） ) or a monovalent cation of the perovskite quantum dot particle, i.e., a compound having the general formula AMX ３A compound that forms a coordinate bond with A in the formula (I) by substituting the cation moiety of the organic base ligand. The organic base ligand is a ligand selected from the group consisting of aliphatic amine compounds, aromatic amine compounds, and quaternary ammonium salts. Specific examples of the organic base ligand include aliphatic amine compounds having 3 to 16 carbon atoms, such as oleylamine, propylamine, butylamine, pentylamine, octylamine, hexadecylamin, and octadecylamine; aromatic amine compounds having 6 to 34 carbon atoms, such as aniline, benzylamine, phenethylamine, 3-phenyl-2-propen-1-amine, phenylmethylamine, 2,2'-iminodibenzoic acid, 3-phenylpropylamine, 4-phenylbutylamine, naphthylamine, 4-aminobiphenyl, and 3,4,5-tris(prop-2-en-1-yloxy)benzylamine; and aliphatic quaternary ammonium salt compounds, such as didecyldimethylammonium salt, benzyltrimethylammonium bromide, 3-(N,N-dimethyloctadecylammonio)propanesulfonate salt, and stearyltrimethylammonium salt. These compounds may be used alone or in combination of two or more in any ratio.

[0144] The ligand may be mixed with the precursor solution in advance and then mixed with the nonpolar solvent, or may be mixed with the nonpolar solvent in advance and then mixed with the precursor solvent. Alternatively, a ligand that is the same as or different from the ligand used in the first step may be mixed with the first solvent in an amount of 50 wt % or less.

[0145] The precursor solution, the ligand, and the nonpolar solvent can be mixed at a predetermined liquid temperature. The liquid temperature is usually 40°C or less, preferably 35°C or less, more preferably 30°C or less, and usually 10°C or more, preferably 15°C or more, more preferably 20°C or more. By mixing the precursor solution and the nonpolar solvent at a liquid temperature within the above range, luminescent nanoparticles can be stably synthesized. The precursor solution and the nonpolar solvent usually form a suspension when mixed.

[0146] In the fifth step, the obtained suspension is sedimented to recover the solid content. A preferred method for this is a method in which the solid content in the suspension is separated by centrifugal force and the settled solid content is recovered (centrifugation method). The centrifugation method can be performed using a known centrifuge device by appropriately adjusting the rotation speed.

[0147] In the fifth step, the supernatant liquid separated from the suspension is usually removed to obtain a solid content.

[0148] The sixth step is a step of dispersing the solid content obtained in the fifth step in a first solvent, and then classifying the solid content to remove coarse particles.

[0149] The dispersion medium is usually a first solvent. The first solvent may contain the above-mentioned ligand. In the sixth step, a pre-dispersion is usually obtained by dispersing the solid content in the first solvent.

[0150] A preferred method for classifying the solid content from the pre-dispersion and removing coarse powder is to separate the coarse powder in the pre-dispersion by centrifugal force. When the pre-dispersion is centrifuged, luminescent nanoparticles having the desired particle size usually remain dispersed in the supernatant, while the coarse powder may settle. By removing the coarse powder from the pre-dispersion after centrifugation, a dispersion containing luminescent nanoparticles and a first solvent can be obtained. In the first step, any component can be appropriately selected and mixed with the obtained dispersion, as needed.

[0151] (Second Step: Step of Obtaining a Resin Solution) The second step is a step of obtaining a resin solution containing a resin and the second solvent. The types of resin and second solvent and the weight of each component are usually selected taking into consideration the liquid dielectric constant of the dispersion obtained in the first step. In the second step, a resin solution can usually be obtained by dissolving the resin in the second solvent. In the second step, if necessary, a process of mixing and stirring the resin and the second solvent may be performed. Furthermore, in the second step, if necessary, any component can be appropriately selected and mixed with the obtained resin solution. For example, a liquid dielectric constant modifier can be mixed in order to adjust the liquid dielectric constant of the resin solution.

[0152] (Third Step: Step of Obtaining a Luminous Resin Ink) The third step is a step of mixing the dispersion liquid and the resin solution. In the third step, the dispersion liquid and the resin solution may be kneaded as necessary. In the third step, the luminous resin ink can be obtained by mixing the dispersion liquid and the resin solution.

[0153] In the manufacturing method of the first embodiment, in addition to the first to third steps described above, any step may be selected and added as appropriate.

[0154] 5.2. Manufacturing Method of Second Embodiment The manufacturing method of the luminous resin ink of the second embodiment includes at least the first and fourth steps described above. In the manufacturing method of the second embodiment, the liquid dielectric constant ε of the dispersion liquid obtained in the first step is １ (μS / cm) and the relative dielectric constant ε of the resin used in the fourth step ４ (μS / cm) preferably satisfies the above-mentioned formula (4′), and in that case, the liquid dielectric constant ε １１ (μS / cm) and the relative dielectric constant ε of the resin ４ It is more preferable that (μS / cm) satisfies the above-mentioned formula (4).

[0155] The first step is the same as the first step in the manufacturing method of the first embodiment, and therefore a description thereof will be omitted here.

[0156] The fourth step is a step of mixing the dispersion liquid and the resin. In the fourth step, the dispersion liquid and the resin are usually mixed together to dissolve the resin in the dispersion liquid, thereby obtaining a luminous resin ink containing the dispersion liquid and the resin.

[0157] In the manufacturing method of the second embodiment, in addition to the first and fourth steps described above, any step may be selected and added as appropriate.

[0158] 6. Uses of Luminous Resin Ink The luminous resin ink described above can generally be used as a material for the optical components described below. Furthermore, among luminous resin inks, luminous resin inks in particular those in which perovskite quantum dot particles are dispersed can take advantage of the excellent optical properties of the perovskite quantum dot particles when exposed to an excitation light source, and can be used as light wavelength conversion materials in a wide range of fields, such as next-generation displays and agricultural films using LEDs or sunlight as light sources.

[0159] 7. Optical Member An optical member according to one embodiment of the present invention includes a luminescent resin layer formed from the luminescent resin ink described above.

[0160] According to this embodiment, since the luminous resin layer is formed using the above-described luminous resin ink, it is possible to provide an optical member having a luminous resin layer with good PLQY.

[0161] The optical member may be in the form of, for example, a film containing a light-emitting resin layer. When the optical member is the above-mentioned film, its thickness is not limited, but may be, for example, 10 μm or more and 1000 μm or less.

[0162] The optical member may be in the form of, for example, a laminate including a substrate and a luminescent resin layer provided on the substrate. In this case, the luminescent resin layer may be provided on the entire surface of the substrate, or may be provided on only a part of the substrate.

[0163] 8. Method for Manufacturing Optical Member The optical member described above can be manufactured by any manufacturing method using the luminescent resin ink described above, but a manufacturing method including the following seventh and eighth steps is preferred.

[0164] A seventh step: forming a coating layer on a substrate using the luminescent resin ink. An eighth step: solidifying the coating layer to obtain the luminescent resin layer.

[0165] (Seventh Step: Step of Obtaining a Coating Layer) The seventh step is a step of forming a coating layer on a substrate using the luminescent resin ink. The substrate may be, for example, a glass substrate or a resin substrate.

[0166] The method for applying the luminescent resin ink is not limited and can be appropriately selected depending on the application of the luminescent resin layer, etc. Examples include application methods using a die coater, gravure coater, comma coater, knife coater, or inkjet.

[0167] (Step 8: Step of Obtaining a Light-Emitting Resin Layer) Step 8 is a step of solidifying the coating layer obtained in Step 7 to obtain a light-emitting resin layer. For example, when the resin contained in the coating layer is a thermoplastic resin, a method of solidifying the coating layer by drying the coating layer can be mentioned. Drying methods include natural drying, heat drying, reduced-pressure drying, and reduced-pressure heat drying.

[0168] Furthermore, as a method for solidifying the coating layer, for example, when the resin contained in the coating layer is a curable resin, the coating layer may be dried and then cured by ultraviolet irradiation, heating, etc. The conditions for the curing treatment may be appropriately set depending on the type of curable resin.

[0169] 9. Light-emitting device A light-emitting device according to one embodiment of the present invention includes the optical member described above. In this light-emitting device, the optical member can usually function as a light conversion element.

[0170] According to this embodiment, by using the optical member as a light conversion element, a light emitting device with good luminous efficiency can be obtained.

[0171] A light emitting device typically includes a light source and a light conversion element, and a portion of the light from the light source is transmitted through the light conversion element, whereby the wavelength of the light is converted.

[0172] The light source may be any light source capable of emitting light of a wavelength that can serve as excitation light for the luminescent nanoparticles, and examples thereof include known light sources such as light-emitting diodes (LEDs), lasers, etc. Among these, LEDs are preferred, and blue light-emitting diodes (blue LEDs) and ultraviolet light-emitting diodes (ultraviolet LEDs) are more preferred.

[0173] For example, when a blue light-emitting diode is used as the light source, the light-emitting nanoparticles contained in the optical member preferably include light-emitting nanoparticles that emit red fluorescence and light-emitting nanoparticles that emit green fluorescence. By converting a portion of the blue light of the blue light-emitting diode into red light and green light, a light-emitting device that emits white light can be obtained.

[0174] 10. Power Generating Device A power generating device according to one embodiment of the present invention includes the optical member described above. In this power generating device, the optical member can function as a power generating element.

[0175] According to this embodiment, by using the optical member as a power generating element, a power generating device with good power generating efficiency can be obtained.

[0176] In the power generating device according to this embodiment, quantum dot materials having a perovskite crystal structure are typically used as the luminescent nanoparticles contained in the optical member. This power generating device utilizes the semiconductor function of the quantum dot materials having a perovskite crystal structure, and is also called a perovskite solar cell. The power generating element is also called an active layer.

[0177] The power generating device typically includes a first electrode, an electron transport layer, an active layer as a power generating element, a hole transport layer, and a second electrode, in this order. When the active layer is irradiated with light, electrons flow to the first electrode and holes flow to the second electrode, thereby generating an electromotive force. In such a power generating device, the above-mentioned film is typically used as the active layer. The first electrode, electron transport layer, hole transport layer, and second electrode used in the power generating device may be the same as those used in known power generating devices.

[0178] 11. Display Body A display body according to one embodiment of the present invention includes the optical member described above. In this display body, the optical member can function as a light conversion element.

[0179] According to this embodiment, by using the optical member as a light conversion element, a display device capable of clearly displaying a display image can be obtained.

[0180] The display typically includes a light source, a display panel, and a light conversion element. When the display panel is a self-luminous display panel, the display panel may also function as the light source. Examples of the display panel include a liquid crystal panel as a display for a liquid crystal display device and an organic EL panel as a display for an organic electroluminescence display device (hereinafter, sometimes referred to as an "organic EL display device").

[0181] A liquid crystal panel typically includes a liquid crystal cell that includes liquid crystal and electrodes that can apply a voltage to the liquid crystal. The liquid crystal cell may be of any mode, such as an in-plane switching (IPS) mode, a vertical alignment (VA) mode, a multi-domain vertical alignment (MVA) mode, a continuous spin wheel alignment (CPA) mode, a hybrid alignment nematic (HAN) mode, a twisted nematic (TN) mode, a super twisted nematic (STN) mode, or an optically compensated bend (OCB) mode. When the display panel is a liquid crystal panel, it typically includes a separate light source, and includes a light source, a film as a light conversion element, and a liquid crystal panel, in that order.

[0182] An organic EL panel typically includes an organic EL element having a transparent electrode layer, a light-emitting layer, and an electrode layer in this order. In this organic EL element, the light-emitting layer can emit light when a voltage is applied between the transparent electrode layer and the electrode layer. Examples of materials constituting the organic light-emitting layer include polyparaphenylene vinylene-based, polyfluorene-based, and polyvinylcarbazole-based materials. The light-emitting layer may also include a laminate of multiple layers emitting different colors of light, or a mixed layer in which a dye layer is doped with a different dye. Furthermore, the organic EL element may also include functional layers such as a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, an equipotential surface forming layer, and a charge generation layer. When the display panel is an organic EL panel, the film serving as the light conversion element is disposed on the viewing side of the organic EL panel.

[0183] The present invention will be described in detail below with reference to examples. However, the present invention is not limited to the examples shown below, and can be practiced with any modifications within the scope of the claims of the present invention and their equivalents.

[0184] Unless otherwise specified, the operations described below were carried out in the atmosphere at room temperature and atmospheric pressure (23°C, 1 atmosphere).

[0185] [Evaluation Method] <Measurement of Liquid Dielectric Constant and Calculation of Variation Rate> Using a liquid dielectric constant meter Model 871 (Sanyo Trading Co., Ltd.), the liquid dielectric constant ε of the luminescent nanoparticle dispersion (dispersion liquid) was measured at a frequency of 10 kHz and 23°C. １ (μS / cm), the liquid dielectric constant ε of the luminous resin ink ２ (μS / cm), and the liquid dielectric constant ε of the resin solution ３ (μS / cm) was measured.

[0186] From the obtained liquid dielectric constant, the liquid dielectric constant change amount expressed by the following formula (5) and the liquid dielectric constant change rate 1 expressed by the following formula (6) were calculated. The liquid dielectric constant change rate 1 is the rate of change shown on the left side of the above formula (1).

[0187] Liquid dielectric constant change amount = (ε ２ -ε １ ) (μS / cm) (5) Liquid dielectric constant variation rate 1 = |(ε ２ -ε １ ) / ε １ |×100 (%) (6)

[0188] <Measurement of solids concentration of dispersion> The dispersion was diluted with the same solvent as the first solvent, and the sample absorptance was measured using a fluorescence spectrophotometer FP-8600 (manufactured by JASCO Corporation; excitation wavelength 450 nm) equipped with an integrating sphere. The luminescent nanoparticle concentration was calculated from the dilution ratio at which the diluted dispersion had a sample absorptance of 0.5. The sample absorptance represents the proportion of light absorbed by the sample dispersion at the excitation wavelength.

[0189] <Measurement of PLQY and Calculation of PLQY Residual Rate> An integrating sphere was set in a fluorescence spectrophotometer FP-8600 (manufactured by JASCO Corporation; excitation wavelength 450 nm) to measure the PLQY of the dispersion and the PLQY of the luminescent ink.

[0190] From the obtained results, the PLQY residual rate was calculated using the following formula: A higher PLQY residual rate indicates that the decrease in PLQY was more suppressed. PLQY residual rate (%) = (PLQY of luminous resin ink) / (PLQY of dispersion) x 100

[0191] [Example 1] (1) Preparation of dispersion (first step) Formamidine hydrobromide (CH ４ N ２ HBr (Tokyo Chemical Industry Co., Ltd.) 75 mg (0.60 mmol) and lead (II) bromide (PbBr ２ A precursor solution was prepared by dissolving 220 mg (0.60 mmol) of ethanol (manufactured by Tokyo Chemical Industry Co., Ltd.) in 1 mL of N,N-dimethylformamide (DMF, manufactured by Tokyo Chemical Industry Co., Ltd.). A nonpolar solvent was prepared by dissolving 630 μL (2.00 mmol) of oleic acid (manufactured by Merck) and 39 μL (0.24 mmol) of n-octylamine (manufactured by Fujifilm Wako Pure Chemical Industries Co., Ltd.) in 15 mL of propylene glycol monomethyl ether acetate (PGM-Ac, manufactured by Tokyo Chemical Industry Co., Ltd.). The resulting nonpolar solvent was placed in a screw cap vial, and 0.9 mL of the precursor solution was added while stirring at room temperature under atmospheric pressure. The mixture was then mixed for 3 minutes to obtain a suspension. 1.35 mL of the suspension was placed in a centrifuge tube and centrifuged at 16,500 rpm for 3 minutes using a tabletop centrifuge AS165W (manufactured by AS ONE Corporation). The supernatant was then removed to obtain crude nanoparticles. The crude nanoparticles were mixed and dispersed in 1 mL of toluene (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) as a first solvent to prepare a pre-dispersion. The obtained pre-dispersion was centrifuged at 16,500 rpm for 2 minutes. The supernatant was recovered from the pre-dispersion after centrifugation to obtain a dispersion. The solid concentration of the luminescent nanoparticles in the obtained dispersion was 3.17 mg / mL. The liquid dielectric constant of the obtained dispersion was 2.38 μS / cm. The photoluminescence quantum yield (PLQY) was 99.2%.

[0192] (2) Preparation of Resin Solution (Second Step) 40% by weight of cyclic olefin polymer ZEONOR (Zeon Corporation) as a resin was mixed with 10 mL of toluene as a second solvent in a screw cap bottle, and the mixture was mixed at 600 rpm using a rotating stand for 16 hours. Complete dissolution of the resin in the second solvent was confirmed by visual observation, and a resin solution was obtained.

[0193] (3) Production of Luminous Resin Ink (Third Step) 7 g of the resin solution and 0.087 mL of the dispersion were placed in a UG ointment jar and mixed using a mixing device "Awatori Rentaro AR-100" (manufactured by Silky Co., Ltd.) for 20 minutes and degassing for 30 seconds. Uniform luminescence of the mixture was confirmed using a handy UV lamp (manufactured by AS ONE Corporation, ultraviolet wavelength 365 nm), yielding a luminous resin ink. The PLQY of the luminous resin ink was 98.0%, and the liquid dielectric constant was 2.32 μS / cm.

[0194] In Example 1, the liquid dielectric constant variation was −0.06 μS / cm, the liquid dielectric constant variation rate 1 was 2.5%, and the PLQY residual rate was 98.8%.

[0195] [Example 2] A luminous resin ink was produced and evaluated under the same conditions as in Example 1, except that the concentration of the cyclic olefin polymer in the resin solution was changed to 30 wt % and the amount of dispersion liquid added during the production of the luminous resin ink was changed to 0.093 mL. The PLQY of the luminous resin ink was 97.6%, and the liquid dielectric constant was 2.34 μS / cm.

[0196] In Example 2, the liquid dielectric constant variation was −0.04 μS / cm, the liquid dielectric constant variation rate 1 was 1.7%, and the PLQY residual rate was 98.4%.

[0197] [Example 3] A luminous resin ink was produced and evaluated under the same conditions as in Example 2, except that the concentration of the cyclic olefin polymer in the resin solution was changed to 25 wt %. The PLQY of the luminous resin ink was 97.4%, and the liquid dielectric constant was 0.8 μS / cm.

[0198] In Example 3, the liquid dielectric constant variation was −0.02 μS / cm, the liquid dielectric constant variation rate 1 was 0.8%, and the PLQY residual rate was 98.1%.

[0199] [Example 4] A luminous resin ink was produced and evaluated under the same conditions as in Example 2, except that the concentration of the cyclic olefin polymer in the resin solution was changed to 10 wt %. The PLQY of the luminous resin ink was 101.3%, and the liquid dielectric constant was 2.37 μS / cm.

[0200] In Example 4, the liquid dielectric constant variation was −0.01 μS / cm, the liquid dielectric constant variation rate 1 was 0.4%, and the PLQY residual rate was 102.1%.

[0201] [Example 5] A dispersion was produced under the same conditions as in Example 1, except that the first solvent of the dispersion was changed to a mixed solvent of 1 mL of cyclohexane (manufactured by Tokyo Chemical Industry Co., Ltd.), 15 μL (0.048 mmol) of oleic acid, and 1.3 μL (0.004 mmol) of oleylamine. The solids concentration of the dispersion was 15 mg / mL, the PLQY was 100.4%, and the liquid dielectric constant was 2.02 μS / cm.

[0202] A resin solution was prepared under the same conditions as in Example 1, except that cyclohexane was used instead of toluene as the second solvent for the resin solution. 0.021 mL of the obtained luminescent nanoparticle dispersion and 7 g of the resin solution were mixed and confirmed under the same conditions as in Example 1 to prepare and evaluate a luminescent resin ink. The PLQY of the luminescent resin ink was 97.5%, and the liquid dielectric constant was 2.11 μS / cm.

[0203] In Example 5, the liquid dielectric constant variation was 0.09 μS / cm, the liquid dielectric constant variation rate 1 was 4.5%, and the PLQY residual rate was 97.1%.

[0204] [Example 6] A luminous resin ink was produced and evaluated under the same conditions as in Example 5, except that the concentration of the cyclic olefin polymer in the resin solution was changed to 30 wt %. The PLQY of the luminous resin ink was 96.0%, and the liquid dielectric constant was 2.08 μS / cm.

[0205] In Example 6, the liquid dielectric constant variation was 0.06 μS / cm, the liquid dielectric constant variation rate 1 was 3.0%, and the PLQY residual rate was 95.6%.

[0206] [Example 7] A luminous resin ink was produced and evaluated under the same conditions as in Example 5, except that the concentration of the cyclic olefin polymer in the resin solution was changed to 25 wt %. The PLQY of the luminous resin ink was 98.0%, and the liquid dielectric constant was 2.07 μS / cm.

[0207] In Example 7, the liquid dielectric constant variation was 0.05 μS / cm, the liquid dielectric constant variation rate 1 was 2.5%, and the PLQY residual rate was 97.6%.

[0208] [Example 8] A luminous resin ink was produced and evaluated under the same conditions as in Example 5, except that the concentration of the cyclic olefin polymer in the resin solution was changed to 10 wt %. The PLQY of the luminous resin ink was 96.1%, and the liquid dielectric constant was 2.04 μS / cm.

[0209] In Example 8, the liquid dielectric constant variation was 0.02 μS / cm, the liquid dielectric constant variation rate 1 was 1.0%, and the PLQY residual rate was 95.7%.

[0210] [Example 9] A dispersion was produced and evaluated under the same conditions as in Example 1, except that the first solvent of the dispersion was changed to a mixed solvent of 1 mL of methylcyclohexane (manufactured by Tokyo Chemical Industry Co., Ltd.), 15 μL of oleic acid, and 13 μL of oleylamine. The solids concentration of the dispersion was 15 mg / mL, the PLQY was 101.9%, and the liquid dielectric constant was 2.02 μS / cm.

[0211] A resin solution was prepared under the same conditions as in Example 1, except that methylcyclohexane was used instead of toluene as the second solvent for the resin solution. 0.021 mL of the resulting dispersion and 7 g of the resin solution were mixed and confirmed under the same conditions as in Example 1 to prepare and evaluate a luminescent resin ink. The PLQY of the luminescent resin ink was 96.6%, and the liquid dielectric constant was 2.11 μS / cm.

[0212] In Example 9, the liquid dielectric constant variation was 0.09 μS / cm, the liquid dielectric constant variation rate 1 was 4.5%, and the PLQY residual rate was 94.8%.

[0213] [Example 10] A luminous resin ink was produced and evaluated under the same conditions as in Example 9, except that the concentration of the cyclic olefin polymer in the resin solution was changed to 30 wt %. The PLQY of the luminous resin ink was 94.6%, and the liquid dielectric constant was 2.09 μS / cm.

[0214] In Example 10, the liquid dielectric constant variation was 0.07 μS / cm, the liquid dielectric constant variation rate 1 was 3.5%, and the PLQY residual rate was 92.9%.

[0215] [Example 11] A luminous resin ink was produced and evaluated under the same conditions as in Example 9, except that the concentration of the cyclic olefin polymer in the resin solution was changed to 25 wt %. The PLQY of the luminous resin ink was 95.0%, and the liquid dielectric constant was 2.07 μS / cm.

[0216] In Example 11, the liquid dielectric constant variation was 0.05 μS / cm, the liquid dielectric constant variation rate 1 was 2.5%, and the PLQY residual rate was 93.3%.

[0217] [Example 12] A luminous resin ink was produced and evaluated under the same conditions as in Example 9, except that the concentration of the cyclic olefin polymer in the resin solution was changed to 10 wt %. The PLQY of the luminous resin ink was 97.0%, and the liquid dielectric constant was 2.04 μS / cm.

[0218] In Example 12, the liquid dielectric constant variation was 0.02 μS / cm, the liquid dielectric constant variation rate 1 was 1.0%, and the PLQY residual rate was 95.3%.

[0219] [Example 13] A luminous resin ink was produced and evaluated under the same conditions as in Example 4, except that the resin in the resin solution was a methacrylic acid ester polymer (PMMA, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) and 7 g of the resin solution and 0.093 mL of the dispersion liquid were mixed when producing the luminous resin ink. The PLQY of the luminous resin ink was 80.0%, and the liquid dielectric constant was 2.60 μS / cm.

[0220] In Example 13, the liquid dielectric constant variation was 0.22 μS / cm, the liquid dielectric constant variation rate 1 was 9.2%, and the PLQY residual rate was 80.6%.

[0221] Example 14 Formamidine hydrobromide (CH４ N ２ ・HBr) 25mg (0.20mmol), lead(II) bromide (PbBr ２ A precursor solution was prepared by dissolving 110.2 mg (0.40 mmol) of methyl ketone (C10), 320 μL (1.02 mmol) of oleic acid, and 20 μL (0.12 mmol) of n-octylamine in 1 mL of 1-methyl-2-pyrrolidone (NMP, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.).

[0222] 15 mL of toluene as a nonpolar solvent was placed in a screw cap bottle, and 0.6 mL of the precursor solution was added thereto while stirring at room temperature under atmospheric pressure. The mixture was mixed for 3 minutes to obtain a suspension. 1.3 mL of the suspension was placed in a centrifuge tube and centrifuged at 12,000 rpm for 2 minutes using a tabletop centrifuge AS165W (manufactured by AS ONE Corporation). The supernatant was removed to obtain crude nanoparticles. The crude nanoparticles were dispersed in 0.6 mL of toluene as the first solvent to prepare a pre-dispersion. The resulting pre-dispersion was centrifuged at 8,000 rpm for 2 minutes. The supernatant was recovered to obtain a dispersion. The resulting dispersion had a solids concentration of 2 mg / mL, a PLQY of 98.0%, and a liquid dielectric constant of 2.38 μS / cm.

[0223] A cyclic olefin polymer ZEONOR (Zeon Corporation) was prepared as a resin, and 2-hydroxy-4-n-octyloxybenzophenone (Tokyo Chemical Industry Co., Ltd.) was prepared as a liquid dielectric constant adjuster. 35 mL of cyclohexane was used as a second solvent, and 25 wt % of the resin and 2.8 wt % of the liquid dielectric constant adjuster were mixed in a screw tube bottle. The mixture was then mixed at 600 rpm for 16 hours using a rotating stand. Complete dissolution was confirmed visually, yielding a resin solution.

[0224] 7 g of resin solution and 0.62 mL of luminescent nanoparticle dispersion were placed in a UG ointment jar and mixed using a mixing device "Awatori Rentaro AR-100" (manufactured by Silky Corporation) for 20 minutes and degassed for 30 seconds. Uniform emission was confirmed using a handy UV lamp (manufactured by AS ONE Corporation, ultraviolet wavelength 365 nm), yielding a luminescent resin ink. The PLQY of the luminescent resin ink was 86.7%, and the liquid dielectric constant was 2.18 μS / cm.

[0225] In Example 14, the liquid dielectric constant variation was −0.20 μS / cm, the liquid dielectric constant variation rate 1 was 8.4%, and the PLQY residual rate was 86.7%.

[0226] Example 15: 5.78 g of a cyclic olefin polymer was added directly to a screw cap vial to 10 mL of a dispersion prepared using the same procedure as in Example 1, and the mixture was mixed for 12 hours at 600 rpm using a rotating stand. The resulting mixture was placed in a UG ointment jar and mixed using a mixing device "Awatori Rentaro AR-100" (manufactured by Silky Co., Ltd.) by kneading for 20 minutes and degassing for 30 seconds (Step 4). Uniform emission was confirmed using a handy UV lamp (As One Corporation, ultraviolet wavelength 365 nm), and a luminescent resin ink was prepared. The PLQY of the luminescent resin ink was 94.0%, and the liquid dielectric constant was 2.32 μS / cm.

[0227] In Example 15, the liquid dielectric constant variation was −0.06 μS / cm, the liquid dielectric constant variation rate 1 was 2.5%, and the PLQY residual rate was 94.7%.

[0228] Example 16: 0.19 mL of luminescent nanoparticle dispersion prepared using the same procedure as in Example 1, 9.81 mL of toluene, and 6.08 mL of methacrylic acid ester (MMA, Fujifilm Wako Pure Chemical Industries, Ltd.) were added to a screw cap bottle and mixed for 12 hours at 600 rpm using a rotating stand. Uniform emission was confirmed using a handy UV lamp (AS ONE Corporation, ultraviolet wavelength 365 nm), and a luminescent resin ink was prepared. The PLQY of the luminescent resin ink was 83.0%, and the liquid dielectric constant was 2.53 μS / cm.

[0229] In Example 16, the liquid dielectric constant variation was 0.15 μS / cm, the liquid dielectric constant variation rate 1 was 6.3%, and the PLQY residual rate was 83.6%.

[0230] [Comparative Example 1] A luminous resin ink was produced and evaluated under the same conditions as in Example 1, except that the resin in the resin solution was PMMA and 7 g of the resin solution and 0.087 mL of the luminous nanoparticle dispersion were mixed when producing the luminous resin ink. The PLQY of the luminous resin ink was 46.0%, and the liquid dielectric constant was 3.45 μS / cm.

[0231] In Comparative Example 1, the liquid dielectric constant variation was 1.07 μS / cm, the liquid dielectric constant variation rate 1 was 45.0%, and the PLQY residual rate was 46.4%.

[0232] [Comparative Example 2] A luminous resin ink was produced and evaluated under the same conditions as in Example 2, except that the resin in the resin solution was changed to PMMA. The PLQY of the luminous resin ink was 59.0%, and the liquid dielectric constant was 3.19 μS / cm.

[0233] In Comparative Example 2, the liquid dielectric constant variation was 0.81 μS / cm, the liquid dielectric constant variation rate 1 was 34.0%, and the PLQY residual rate was 59.5%.

[0234] [Comparative Example 3] A luminous resin ink was produced and evaluated under the same conditions as in Example 3, except that the resin in the resin solution was changed to PMMA. The PLQY of the luminous resin ink was 60.0%, and the liquid dielectric constant was 3.01 μS / cm.

[0235] In Comparative Example 3, the liquid dielectric constant variation was 0.63 μS / cm, the liquid dielectric constant variation rate 1 was 26.5%, and the PLQY residual rate was 60.5%.

[0236] [Comparative Example 4] A luminous resin ink was produced and evaluated under the same conditions as in Example 15, except that the resin used in producing the luminous resin ink was changed to PMMA. The PLQY of the luminous resin ink was 25.0%, and the liquid dielectric constant was 3.45 μS / cm.

[0237] In Comparative Example 4, the liquid dielectric constant variation was 1.07 μS / cm, the liquid dielectric constant variation rate 1 was 45.5%, and the PLQY residual rate was 25.3%.

[0238] [Comparative Example 5] A luminous resin ink was prepared and evaluated under the same conditions as in Example 14, except that the liquid dielectric constant adjuster 2-hydroxy-4-n-octyloxybenzophenone (TCI) was not added to the resin solution. The PLQY of the luminous resin ink was 76.0%, and the liquid dielectric constant was 2.07 μS / cm.

[0239] In Comparative Example 5, the liquid dielectric constant variation was 0.31 μS / cm, the liquid dielectric constant variation rate 1 was 13.0%, and the PLQY residual rate was 77.6%.

[0240] The results are shown in Table 1.

[0241]

[0242] In addition, the liquid dielectric constant ε of the first solvent in Examples 1 to 16 and Comparative Examples 1 to 5 １１ (μS / cm), the liquid dielectric constant ε of the resin solution ３ (μS / cm) (In Example 15 and Comparative Example 4, the relative dielectric constant ε ４ (μS / cm)) was measured, and the liquid dielectric constant variation 2 expressed by the following formula (7) and the liquid dielectric constant variation 3 expressed by the following formula (8) were calculated. Liquid dielectric constant variation 2 = |{(ε １１ ×p / 100+ε ３ ×q / 100)-ε １１} / ε １１ |×100 (7) Liquid dielectric constant variation rate 3 = |{(ε １１ ×p / 100+ε ４ × r / 100) - ε １１} / ε １１ |×100 (8)

[0243] The results are shown in Tables 2 and 3. The fluctuation rate in Tables 2 and 3 indicates a liquid dielectric constant fluctuation rate of 2 except for Example 14 and Comparative Example 4, and indicates a liquid dielectric constant fluctuation rate of 3 for Example 15 and Comparative Example 4. In Example 15, "*" indicates that the content of the resin (cyclic olefin polymer) was 5.78 g and the relative dielectric constant was 2.25 (μS / cm), and in Comparative Example 4, "**" indicates that the content of the resin (PMMA) was 5.78 g and the relative dielectric constant was 5.10 (μS / cm).

[0244]

[0245]

[0246] Example 17 An optical wavelength conversion member was manufactured using the following procedure. The luminescent resin ink obtained in Example 1 was uniformly applied to a base film at a coating speed of 50 mm / sec using a multi-film applicator (1806F / 150 manufactured by BEVS) with a gap set to 550 μm and an automatic film applicator (manufactured by Tester Sangyo Co., Ltd.). The molded product was dried on the automatic film applicator at 70°C for 20 minutes, and then peeled off from the base film to obtain a film-like luminescent nanoparticle dispersion member. The thickness was measured using a digital thickness gauge (PG02A manufactured by Teclock Corporation), resulting in an optical wavelength conversion member with a thickness of 103 μm.

[0247] The PLQY of the obtained optical wavelength conversion member was measured using an apparatus equipped with an integrating sphere attached to a fluorescence spectrophotometer FP-8600 (manufactured by JASCO Corporation; excitation wavelength 450 nm). The PLQY was 97.6%, indicating that a member with extremely high luminescence properties was obtained.

Claims

1. A luminous resin ink comprising at least a dispersion liquid containing luminous nanoparticles and a first solvent, and a resin, wherein the liquid dielectric constant ε of the dispersion liquid is １ (μS / cm), and the liquid dielectric constant ε of the luminous resin ink ２ (μS / cm) satisfies the following formula (1): ２ -ε １ ) / ε １ | × 100 ≦ 10 (%) (1) 2. The liquid dielectric constant ε of the dispersion １ (μS / cm), and the liquid dielectric constant ε of the luminous resin ink ２ 2. The luminous resin ink according to claim 1, wherein |ε (μS / cm) satisfies the following formula (2): ２ -ε １ |≦0.25 (μS / cm) (2) 3. The luminous resin ink contains a resin solution containing the resin and a second solvent, and the liquid dielectric constant ε of the first solvent in the dispersion liquid is １１ (μS / cm), and the liquid dielectric constant ε of the resin solution ３ 2. The luminous resin ink according to claim 1, wherein |{(ε １１ ×p / 100+ε ３ ×q / 100)-ε １１ } / ε １１ |×100≦10(%) (3) (In the formula (3), p is the weight-based content ratio (wt%) of the dispersion liquid relative to the luminous resin ink, q is the weight-based content ratio (wt%) of the resin solution relative to the luminous resin ink, and 90<(p+q)≦100 (wt%).) 4. The liquid dielectric constant ε of the first solvent of the dispersion １１ (μS / cm), and the relative dielectric constant ε of the resin ４ 2. The luminous resin ink according to claim 1, wherein |{(ε １１ ×p / 100+ε ４ × r / 100) - ε １１ } / ε １１ |×100≦10(%) (4) (In the formula (4), p is the weight-based content ratio (wt%) of the dispersion liquid relative to the luminous resin ink, r is the weight-based content ratio (wt%) of the resin relative to the luminous resin ink, and 90<(p+r)≦100 (wt%).) 5. The luminescent resin ink of claim 1, wherein the resin comprises an olefin polymer.

6. The luminescent resin ink according to claim 5, wherein the olefin polymer comprises a cyclic olefin polymer.

7. The luminescent resin ink according to claim 6, wherein the cyclic olefin polymer comprises a norbornene polymer, and the norbornene polymer comprises at least one selected from the group consisting of a hydrogenated ring-opening polymer of a monomer having a norbornene structure, an addition copolymer of a monomer having a norbornene structure and an α-olefin, and a hydrogenated copolymer thereof.

8. The luminescent resin ink according to claim 6, wherein the cyclic olefin polymer comprises a hydrogenated block copolymer [E], and the hydrogenated block copolymer [E] is a hydrogenated block copolymer obtained by hydrogenating a block copolymer [D] comprising a polymer block [A] mainly composed of a repeating unit [I] derived from an aromatic vinyl compound, and a polymer block [B] mainly composed of a repeating unit [I] derived from an aromatic vinyl compound and a repeating unit [II] derived from a linear conjugated diene compound, or a polymer block [C] mainly composed of a repeating unit [II] derived from a linear conjugated diene compound.

9. The luminescent resin ink according to claim 6, wherein the cyclic olefin polymer contains an alkoxysilyl group.

10. The luminescent resin ink according to claim 5, wherein the olefin polymer comprises a block copolymer [D] consisting of a polymer block [A] mainly composed of a repeating unit [I] derived from an aromatic vinyl compound, and a polymer block [B] mainly composed of a repeating unit [I] derived from an aromatic vinyl compound and a repeating unit [II] derived from a chain conjugated diene compound, or a polymer block [C] mainly composed of a repeating unit [II] derived from a chain conjugated diene compound.

11. The luminous resin ink according to claim 1, wherein the resin is contained in an amount of 10 parts by weight or more and 99.99 parts by weight or less per 100 parts by weight of the luminous resin ink, and the viscosity is 10 Pa·s or less.

12. The luminescent resin ink according to claim 1, wherein the luminescent nanoparticles comprise metal halide perovskite particles having an average particle size of 1 nm or more and 30 nm or less.

13. An optical element comprising a luminescent resin layer formed from the luminescent resin ink according to any one of claims 1 to 12.

14. A light emitting device comprising the optical member according to claim 13.

15. A power generating device comprising the optical element according to claim 13.

16. A display comprising the optical element according to claim 13.

17. A method for producing a luminescent resin ink according to claim 1, comprising: a first step of obtaining a dispersion liquid containing the luminescent nanoparticles and the first solvent; a second step of obtaining a resin solution containing the resin and the second solvent; and a third step of mixing the dispersion liquid and the resin solution.

18. A method for producing a luminescent resin ink according to claim 1, comprising: a first step of obtaining a dispersion liquid containing the luminescent nanoparticles and the first solvent; and a fourth step of mixing the dispersion liquid with the resin.

19. A method for producing a luminescent resin ink according to claim 17 or claim 18, wherein the first step comprises: a fifth step of preparing a suspension by mixing a precursor solution containing a precursor of the luminescent nanoparticles, a ligand, and a non-polar solvent at a liquid temperature of 40°C or less, and recovering solids by settling and separating the suspension; and a sixth step of dispersing the solids in the first solvent and then classifying the solids to remove coarse powder.

20. A method for manufacturing an optical element according to claim 13, comprising: a seventh step of forming a coating layer on a substrate using the luminescent resin ink; and an eighth step of solidifying the coating layer to obtain the luminescent resin layer.

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