Light emitting device, light emitting substrate, and light emitting apparatus

Abstract

The application discloses a light-emitting device, a light-emitting substrate and a light-emitting device, and relates to the technical field of display. The light-emitting device comprises a first electrode, a second electrode which is arranged opposite to the first electrode, and at least one light-emitting layer which is arranged in a stack between the first electrode and the second electrode, wherein the at least one light-emitting layer comprises a first light-emitting material configured to emit a first light under the driving of current or voltage, and a second light-emitting material configured to emit a second light under the driving of current or voltage, wherein the color of the first light is different from the color of the second light.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a light-emitting device, a light-emitting substrate, and a light-emitting apparatus. Background Technology

[0002] Organic light-emitting diodes (OLEDs) are active light-emitting devices with advantages such as self-illumination, wide viewing angle, fast response time, high luminous efficiency, low operating voltage, and simple manufacturing process. They are hailed as the next generation of "star" light-emitting devices. Summary of the Invention

[0003] This disclosure provides a light-emitting device, including:

[0004] First electrode;

[0005] The second electrode is disposed opposite to the first electrode; and

[0006] At least one light-emitting layer is stacked between the first electrode and the second electrode, the at least one light-emitting layer comprising:

[0007] A first luminescent material is configured to emit a first ray of light under the drive of a current or voltage; and

[0008] The second luminescent material is configured to emit a second ray of light when driven by an electric current or voltage;

[0009] The first ray and the second ray are different colors.

[0010] In one alternative implementation, the wavelength of the first light is greater than or equal to 440 nanometers and less than or equal to 490 nanometers.

[0011] In one alternative implementation, the wavelength of the second light is greater than or equal to 500 nanometers and less than or equal to 650 nanometers.

[0012] In one optional implementation, the at least one light-emitting layer includes at least one first light-emitting layer and at least one second light-emitting layer;

[0013] Wherein, the first light-emitting layer includes the first light-emitting material;

[0014] The second light-emitting layer includes the second light-emitting material, or the second light-emitting layer includes the first light-emitting material and the second light-emitting material.

[0015] In one optional implementation, the first electrode is a reflective electrode, and the second electrode is a transmissive electrode or a semi-transmissive electrode; the luminous efficiency of the first luminescent material is less than or equal to the luminous efficiency of the second luminescent material, and the first luminescent layer is located on the side of the second luminescent layer closer to the first electrode.

[0016] In one alternative implementation, the at least one first light-emitting layer is located on the side of the at least one second light-emitting layer closer to the first electrode.

[0017] In one alternative implementation, the first electrode is an anode, the second electrode is a cathode, and the light-emitting device further includes at least one of the following:

[0018] A first hole injection layer, a first hole transport layer, and a first electron blocking layer are stacked between the first electrode and the at least one light-emitting layer, wherein the first hole injection layer is disposed close to the first electrode;

[0019] A first hole blocking layer, a first electron transport layer, a charge generation layer, a second hole injection layer, a second hole transport layer, and a second electron blocking layer are stacked between two adjacent light-emitting layers, with the first hole blocking layer disposed close to the first electrode.

[0020] A second hole-blocking layer, a second electron transport layer, and an electron injection layer are stacked between the at least one light-emitting layer and the second electrode, wherein the electron injection layer is disposed close to the second electrode; and

[0021] A light extraction layer is provided on the side of the second electrode opposite to the first electrode.

[0022] In one alternative implementation, both the first luminescent material and the second luminescent material include at least one of the following: organic electroluminescent material and quantum dots.

[0023] In one alternative implementation, the first ray is a blue ray;

[0024] Wherein, the spectral intensity of the first light emitted by the light-emitting device is a first intensity, the spectral intensity of the second light emitted by the light-emitting device is a second intensity, the first intensity is greater than or equal to the second intensity, and the second intensity is greater than 0; and / or,

[0025] The brightness of the first light emitted by the light-emitting device is called the first brightness, and the brightness of the total light emitted by the light-emitting device is called the second brightness. The ratio of the first brightness to the second brightness is greater than or equal to 14%.

[0026] This disclosure provides a light-emitting substrate, comprising:

[0027] First substrate;

[0028] A plurality of switching elements disposed on the first substrate; and

[0029] The light-emitting device described in any embodiment of the plurality of devices connected to the switching element.

[0030] In one optional implementation, the light-emitting substrate further includes:

[0031] A thin-film encapsulation layer is disposed on the side of the light-emitting device away from the first substrate, and the orthographic projection of the thin-film encapsulation layer on the first substrate covers the first substrate.

[0032] In one optional implementation, the light-emitting substrate further includes:

[0033] A color conversion layer is disposed on the light-emitting side of the light-emitting device, which is used to receive incident light and emit light of a different color than the incident light, wherein the incident light is the light emitted by the light-emitting device.

[0034] In one optional implementation, the incident light includes blue light and a first green light; the light-emitting substrate includes a plurality of pixels, each pixel including a red sub-pixel, a blue sub-pixel, and at least one green sub-pixel, the at least one green sub-pixel including a first green sub-pixel and / or a second green sub-pixel; the color conversion layer includes at least one of the following:

[0035] A first color conversion pattern, located in the red sub-pixel, is used to emit red light under the excitation of the incident light;

[0036] The second color conversion pattern is located in the first green sub-pixel and is used to emit a second green light under the excitation of the incident light.

[0037] The first transmission pattern, located in the second green sub-pixel, is used to transmit the incident light.

[0038] The second transmission pattern, located in the blue sub-pixel, is used to transmit the incident light.

[0039] In one alternative implementation, the thickness of the second color conversion pattern is less than the thickness of the first color conversion pattern.

[0040] In one alternative implementation, the first color conversion pattern is doped with a first scattering particle, and the second color conversion pattern is doped with a second scattering particle; the doping ratio of the first scattering particle in the first color conversion pattern is greater than or equal to the doping ratio of the second scattering particle in the second color conversion pattern.

[0041] In one alternative implementation, the absolute value of the difference between the center wavelength of the first green light and the center wavelength of the second green light is less than or equal to 5 nanometers; and / or,

[0042] The absolute value of the difference between the peak wavelength of the first green light and the peak wavelength of the second green light is less than or equal to 5 nanometers.

[0043] In one alternative implementation, the color conversion layer includes a color conversion material, which includes at least one of the following: quantum dots, rare earth materials, fluorescent materials, and organic dyes.

[0044] In one optional implementation, the light-emitting substrate further includes:

[0045] A color filter layer, disposed on the light-emitting side of the color conversion layer, includes:

[0046] The first color filter pattern is located in the red sub-pixel and is used to transmit red light incident on the first color filter pattern;

[0047] A second color filter pattern, located at the at least one green sub-pixel, is used to transmit green light incident on the second color filter pattern; and

[0048] The third color filter pattern, located in the blue sub-pixel, is used to transmit blue light incident on the third color filter pattern.

[0049] In one optional implementation, the light-emitting substrate further includes:

[0050] A second substrate is disposed on the side of the color filter layer opposite to the color conversion layer; and

[0051] A filler layer is disposed between the thin-film encapsulation layer and the color conversion layer for bonding the thin-film encapsulation layer and the color conversion layer; wherein the thin-film encapsulation layer is located between the light-emitting device and the color conversion layer.

[0052] This disclosure provides a light-emitting device, including:

[0053] The light-emitting substrate as described in any embodiment;

[0054] A driver integrated circuit is configured to provide a driving signal to the light-emitting substrate; and

[0055] A power supply circuit is configured to provide power to the light-emitting substrate.

[0056] The above description is merely an overview of the technical solution disclosed herein. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure are described below. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments or related technologies of this disclosure, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the scale in the drawings is for illustration only and does not represent the actual scale.

[0058] Figure 1 A schematic cross-sectional view of the first light-emitting device provided in this disclosure is shown.

[0059] Figure 2 A schematic cross-sectional view of the second type of light-emitting device provided in this disclosure is shown.

[0060] Figure 3 A schematic cross-sectional view of the third type of light-emitting device provided in this disclosure is shown.

[0061] Figure 4 A schematic cross-sectional view of the fourth type of light-emitting device provided in this disclosure is shown.

[0062] Figure 5 A schematic cross-sectional view of the fifth type of light-emitting device provided in this disclosure is shown.

[0063] Figure 6 A schematic cross-sectional structural diagram of the sixth type of light-emitting device provided in this disclosure is shown.

[0064] Figure 7 The spectral characteristic curves of several light-emitting devices are schematically shown;

[0065] Figure 8 The luminous efficiency test results of several light-emitting devices at different sub-pixels are schematically shown;

[0066] Figure 9 A schematic cross-sectional view of the first type of light-emitting substrate provided in this disclosure is shown.

[0067] Figure 10 A schematic cross-sectional view of the second type of light-emitting substrate provided in this disclosure is shown.

[0068] Figure 11 A schematic cross-sectional view of the third type of light-emitting substrate provided in this disclosure is shown.

[0069] Figure 12 A schematic cross-sectional view of the fourth type of light-emitting substrate provided in this disclosure is shown.

[0070] Figure 13 A schematic diagram of a planar structure of a light-emitting substrate provided in this disclosure is shown.

[0071] Figure 14 A schematic cross-sectional view of an example of a first color conversion pattern is shown.

[0072] Figure 15 A schematic cross-sectional view of an example of a second color conversion pattern is shown.

[0073] Figure 16 A schematic cross-sectional structural diagram of a first example of a transmission pattern is shown.

[0074] Figure 17 A schematic cross-sectional view of an example of a second transmission pattern is shown. Detailed Implementation

[0075] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0076] This disclosure provides a light-emitting device, with reference to... Figures 1 to 6 A schematic cross-sectional view of the light-emitting device provided in this disclosure is shown. Figures 1 to 6 As shown, the light-emitting device includes: a first electrode 11; a second electrode 12 disposed opposite to the first electrode 11; and at least one light-emitting layer 13 stacked between the first electrode 11 and the second electrode 12.

[0077] The aforementioned at least one light-emitting layer 13 includes: a first light-emitting material configured to emit a first light ray under the drive of a current or voltage; and a second light-emitting material configured to emit a second light ray under the drive of a current or voltage. The first light ray and the second light ray are of different colors.

[0078] The first electrode 11 and the second electrode 12 are configured to provide driving current or driving voltage to the light-emitting layer 13.

[0079] In the light-emitting device provided in this disclosure, the light-emitting layer 13 uses two different light-emitting materials, namely a first light-emitting material and a second light-emitting material, so that the light-emitting device can emit two different colors of light, namely a mixture of the first light and the second light, when driven by current or voltage.

[0080] When the color conversion material (such as quantum dots) is irradiated by the light-emitting device provided in this disclosure, since the light-emitting device emits a mixture of the first light and the second light, the first light-emitting material and the second light-emitting material can be adjusted according to the luminous efficiency of the light-emitting material and the brightness conversion rate of the light emitted by the light-emitting material to the color conversion material, so as to achieve the purpose of improving the brightness of the light emitted by the color conversion material.

[0081] Compared with the scheme where all light-emitting layers 13 in the light-emitting device use the same light-emitting material (such as the first light-emitting material or the second light-emitting material), the light-emitting device provided in this embodiment can improve the white light efficiency of the color conversion material and reduce the power consumption of the device.

[0082] The luminous efficiency of a luminescent material refers to the ratio between the luminous flux of the light emitted by the luminescent material and the electrical power consumed. The brightness conversion rate of the light emitted by the luminescent material to the color conversion material after photoexcitation is the ratio of the brightness of the light emitted by the color conversion material to the brightness of the light emitted by the luminescent material.

[0083] The light-emitting device emits light electrically, while the color-converting material emits light optically. In the combined device consisting of the light-emitting device and the color-converting material, the color-converting material emits light when excited by the light emitted by the light-emitting device. In this case, the white light efficiency of the color-converting material refers to the ratio between the brightness of the white light emitted by the color-converting material (e.g., including red, blue, and green light) and the current density driving the light-emitting device.

[0084] In some illustrative embodiments, the first light ray is blue light, and the second light ray is visible light other than blue light. For example, the second light ray can be green light, yellow light, or red light, etc.

[0085] Optionally, the wavelength of the first light ray is greater than or equal to 440 nanometers and less than or equal to 490 nanometers. Further, the wavelength of the first light ray is greater than or equal to 450 nanometers and less than or equal to 470 nanometers. For example, the wavelength of the first light ray is 455 nanometers, 460 nanometers, or 465 nanometers, etc.

[0086] Optionally, the wavelength of the second light is greater than or equal to 500 nanometers and less than or equal to 650 nanometers.

[0087] Optionally, the second light is green light. For example, the wavelength of the second light is greater than or equal to 520 nanometers and less than or equal to 540 nanometers.

[0088] Optionally, the second light is yellow light. For example, the wavelength of the second light is greater than or equal to 580 nanometers and less than or equal to 590 nanometers.

[0089] Optionally, the second light source is red light. For example, the wavelength of the second light source is greater than or equal to 620 nanometers and less than or equal to 640 nanometers.

[0090] Optionally, the full width at half maximum (FWHM) of both the first and second rays is less than or equal to 40 nm. Further, the FWHM of both the first and second rays is less than or equal to 20 nm to improve the color purity of the first and second rays.

[0091] To compare the performance of the light-emitting devices, the inventors tested the performance of three types of light-emitting devices (including light-emitting device A, light-emitting device B, and light-emitting device C). Light-emitting devices A, B, and C are all single-layer light-emitting devices. Light-emitting devices A and B are comparative examples, and light-emitting device C is an experimental example. The light-emitting layer in light-emitting device A uses a material that emits green light, the light-emitting layer in light-emitting device B uses a material that emits blue light, and the light-emitting layer 13 in light-emitting device C uses both blue-light-emitting and green-light-emitting materials. The color conversion material used in the tests was quantum dots. The test results are as follows:

[0092] Light-emitting device A emits initial green light with a luminous efficiency of 120 cd / A. The brightness conversion rate of the initial green light photoexcited green quantum dots (i.e., quantum dots capable of emitting green light) to emit green light is 20%–25%, corresponding to a green light luminous efficiency of 24 cd / A–30 cd / A. The brightness conversion rate of the initial green light emitted directly through a filter layer to emit green light is approximately 98%, corresponding to a green light luminous efficiency of approximately 107 cd / A. The brightness conversion rate of the initial green light photoexcited red quantum dots (i.e., quantum dots capable of emitting red light) to emit red light is 15%–25%, corresponding to a red light luminous efficiency of 18 cd / A–30 cd / A.

[0093] Light-emitting device B emits initial blue light with a luminous efficiency of 7.5 cd / A. The conversion rate of the initial blue light to green quantum dots for photoexcitation and emission of green light is 60%–150%, with corresponding green light luminous efficiency of 4.5 cd / A–11.25 cd / A. The conversion rate of the initial blue light to red quantum dots for photoexcitation and emission of red light is 30%–60%, with corresponding red light luminous efficiency of 2.25 cd / A–4.5 cd / A. Therefore, the white light efficiency of light-emitting device B (the sum of blue, red, and green light luminous efficiencies) is 14.25 cd / A–23.25 cd / A.

[0094] The light-emitting device C emits initial green and initial blue light. The luminous efficiency of the initial green light is greater than or equal to 40 cd / A, and the luminous efficiency of the initial blue light is approximately 4 cd / A. The luminous efficiency of the initial green light after passing through green quantum dots is 8 cd / A to 10 cd / A. The luminous efficiency of the initial green light after passing directly through a filter layer can reach 38 cd / A. The luminous efficiency of the initial green light after passing through red quantum dots is 6 cd / A to 10 cd / A. The luminous efficiency of the initial blue light after passing through red quantum dots is 1.2 cd / A to 2.4 cd / A, and the luminous efficiency of the initial blue light after passing through green quantum dots is 2.4 cd / A to 6 cd / A.

[0095] Calculations show that when the initial green light passes through the green quantum dot, the white light efficiency of light-emitting device C is 21.6 cd / A to 32.4 cd / A; when the initial green light passes directly through the filter layer, the white light efficiency of light-emitting device C is 49.2 cd / A to 54.4 cd / A. Therefore, compared to light-emitting device B, the white light efficiency of light-emitting device C is significantly improved.

[0096] In some illustrative embodiments, the first light source is blue light, and the second light source is green light. Accordingly, the first luminescent material is a luminescent material capable of emitting blue light, and the second luminescent material is a luminescent material capable of emitting green light.

[0097] In a specific implementation, the above-mentioned light-emitting device may include a single light-emitting layer 13; it may also include multiple light-emitting layers 13 stacked together, such as... Figures 1 to 6 As shown.

[0098] When the light-emitting device includes only one light-emitting layer 13, the first light-emitting material and the second light-emitting material are located within the same light-emitting layer 13.

[0099] When the light-emitting device includes multiple light-emitting layers 13 stacked together, such as Figures 1 to 6 As shown, each of the plurality of light-emitting layers 13 may include a first light-emitting material, or a second light-emitting material, or both a first light-emitting material and a second light-emitting material; this disclosure does not limit the specific materials used.

[0100] In some illustrative embodiments, such as Figures 1 to 6 As shown, the at least one light-emitting layer 13 includes a plurality of light-emitting layers 13 stacked together. The plurality of light-emitting layers 13 includes at least one first light-emitting layer 131 and at least one second light-emitting layer 132.

[0101] The first light-emitting layer 131 includes a first light-emitting material; the second light-emitting layer 132 includes a second light-emitting material, or the second light-emitting layer 132 includes both the first and second light-emitting materials.

[0102] Optionally, the first electrode 11 is a reflective electrode, and the second electrode 12 is a transmissive electrode or a semi-transmissive electrode.

[0103] In a specific implementation, the first electrode 11 can be made of metal materials such as magnesium or silver, and the second electrode 12 can be made of metal oxide materials such as indium tin oxide.

[0104] Optionally, the luminous efficiency of the first luminescent material is less than or equal to the luminous efficiency of the second luminescent material, and the first luminescent layer 131 is located on the side of the second luminescent layer 132 closer to the first electrode 11, such as... Figures 1 to 6 As shown.

[0105] The luminous efficiency of the first luminous material refers to the ratio between the luminous flux of the light emitted by the first luminous material (i.e., the first ray) and the electrical power consumed. The luminous efficiency of the second luminous material refers to the ratio between the luminous flux of the light emitted by the second luminous material (i.e., the second ray) and the electrical power consumed.

[0106] Since the first electrode 11 is a reflective electrode and the second electrode 12 is a transmissive electrode or a semi-transmissive electrode, the multiple light-emitting layers 13 are located in a resonant cavity composed of a reflective film (i.e., the reflective electrode: the first electrode 11) and a transmissive film (i.e., the transmissive electrode or the semi-transmissive electrode: the second electrode 12), forming a microcavity structure between the reflective film and the transmissive film.

[0107] Since the luminous efficiency of the first light-emitting layer 131 is lower than that of the second light-emitting layer 132, by placing the first light-emitting layer 131 close to the first electrode 11, the first light-emitting layer 131 with lower luminous efficiency is closer to the reflective film in the microcavity structure, which can reduce the impact of the first light-emitting layer 131 on the overall luminous efficiency of the light-emitting device.

[0108] Since the second light-emitting layer 132 has high luminous efficiency, by placing the second light-emitting layer 132 at a position far away from the first electrode 11, the second light-emitting layer 132 with high luminous efficiency is far away from the reflective film in the microcavity structure, which helps to improve the overall luminous efficiency of the light-emitting device.

[0109] Furthermore, such as Figures 1 to 6 As shown, the at least one first light-emitting layer 131 is located on the side of the at least one second light-emitting layer 132 that is close to the first electrode 11, that is, all the first light-emitting layers 131 in the light-emitting device are located on the side of all the second light-emitting layers 132 that are close to the first electrode 11.

[0110] For example, such as Figure 1 As shown, the plurality of light-emitting layers 13 include a first light-emitting layer 131 and a second light-emitting layer 132, with the first light-emitting layer 131 located on the side of the second light-emitting layer 132 closer to the first electrode 11. That is, the first electrode 11, the first light-emitting layer 131, the second light-emitting layer 132, and the second electrode 12 are stacked sequentially.

[0111] For example, such as Figure 2 As shown, the plurality of light-emitting layers 13 include two first light-emitting layers 131 and one second light-emitting layer 132, with the two first light-emitting layers 131 located on the side of the first light-emitting layer 131 closer to the first electrode 11. That is, the first electrode 11, the two first light-emitting layers 131, the second light-emitting layer 132, and the second electrode 12 are stacked sequentially.

[0112] For example, such as Figure 3 As shown, the plurality of light-emitting layers 13 include a first light-emitting layer 131 and two second light-emitting layers 132, with the first light-emitting layer 131 located on the side of the two first light-emitting layers 131 closer to the first electrode 11. That is, the first electrode 11, the first light-emitting layer 131, the two second light-emitting layers 132, and the second electrode 12 are stacked sequentially.

[0113] For example, such as Figure 4 As shown, the plurality of light-emitting layers 13 include three first light-emitting layers 131 and one second light-emitting layer 132, with the three first light-emitting layers 131 located on the side of the second light-emitting layer 132 closer to the first electrode 11. That is, the first electrode 11, the three first light-emitting layers 131, the second light-emitting layer 132, and the second electrode 12 are stacked sequentially.

[0114] For example, such as Figure 5 As shown, the plurality of light-emitting layers 13 include two first light-emitting layers 131 and two second light-emitting layers 132, with the two first light-emitting layers 131 located on the side of the two second light-emitting layers 132 closer to the first electrode 11. That is, the first electrode 11, the two first light-emitting layers 131, the two second light-emitting layers 132, and the second electrode 12 are stacked sequentially.

[0115] For example, such as Figure 6As shown, the plurality of light-emitting layers 13 include three first light-emitting layers 131 and two second light-emitting layers 132, with the three first light-emitting layers 131 located on the side of the two second light-emitting layers 132 closer to the first electrode 11. That is, the first electrode 11, the three first light-emitting layers 131, the two second light-emitting layers 132, and the second electrode 12 are stacked sequentially.

[0116] For example, the plurality of light-emitting layers 13 may further include four first light-emitting layers 131 and one second light-emitting layer 132, with the four first light-emitting layers 131 located on the side of the second light-emitting layer 132 closer to the first electrode 11. That is, the first electrode 11, the four first light-emitting layers 131, the second light-emitting layer 132, and the second electrode 12 are stacked sequentially.

[0117] In specific implementations, the stacking structure of the first light-emitting layer 131 and the second light-emitting layer 132 is not limited to the above-mentioned types. For example, the first light-emitting layer 131 and the second light-emitting layer 132 can also be alternately disposed between the first electrode 11 and the second electrode 12, with the first light-emitting layer 131 located on the side of the second light-emitting layer 132 closer to the first electrode 11; the first light-emitting layer 131 can also be located on the side of the second light-emitting layer 132 closer to the second electrode 1211, etc. This disclosure does not limit this.

[0118] Optionally, such as Figure 4 As shown, the above-mentioned light-emitting device further includes one or more of the following functional film layers: hole injection layer 14, hole transport layer 15, electron blocking layer 16, hole blocking layer 17, charge generation layer 18, electron transport layer 19, and electron injection layer 110, which are stacked between the first electrode 11 and the second electrode 12.

[0119] One or more of the above-mentioned functional film layers can be stacked between the first electrode 11 and at least one light-emitting layer 13, or stacked between two adjacent light-emitting layers 13, or stacked between at least one light-emitting layer 13 and the second electrode 12, depending on actual needs.

[0120] For example, a charge generation layer 18 can be provided between any two adjacent light-emitting layers 13, and at least one light-emitting layer 13 can be connected in series through the charge generation layer 18 to form a series light-emitting device.

[0121] In a series-connected light-emitting device, the charge generation layer 18 can inject charge carriers (such as holes or electrons) into the adjacent light-emitting layer 13. For a given light-emitting layer 13, a portion of its charge carriers are provided by the first electrode 11 and the second electrode 12, while the remaining charge carriers are generated in the charge generation layer 18. Therefore, by providing the charge generation layer 18, the lifetime of the light-emitting device can be improved while reducing power consumption.

[0122] Optionally, the first electrode 11 is the anode and the second electrode 12 is the cathode.

[0123] Optionally, such as Figure 4 As shown, the above-mentioned light-emitting device further includes: a first hole injection layer 141, a first hole transport layer 151 and a first electron blocking layer 161 stacked between the first electrode 11 and at least one light-emitting layer 13, wherein the first hole injection layer 141 is disposed close to the first electrode 11.

[0124] Optionally, the light-emitting device further includes: a first hole blocking layer 171, a first electron transport layer 191, a charge generation layer 18, a second hole injection layer 142, a second hole transport layer 152 and a second electron blocking layer 162 stacked between two adjacent light-emitting layers 13, wherein the first hole blocking layer 171 is disposed close to the first electrode 11.

[0125] Optionally, the light-emitting device further includes: a second hole blocking layer 172, a second electron transport layer 192 and an electron injection layer 110 stacked between at least one light-emitting layer 13 and the second electrode 12, wherein the electron injection layer 110 is disposed close to the second electrode 12.

[0126] Optionally, the light-emitting device further includes: at least one light extraction layer 111 disposed on the side of the second electrode 12 opposite to the first electrode 11, wherein at least one light extraction layer 111 is stacked.

[0127] For example, the thicknesses of the sequentially stacked films are as follows: first electrode 11 is 8 nm; first hole injection layer 141 is 10 nm; first hole transport layer 151 is 115 nm; first electron blocking layer 161 is 10 nm; first light-emitting layer 131 is 25 nm; first hole blocking layer 171 is 5 nm; first electron transport layer 191 is 30 nm; charge generation layer 18 is 15 nm; second hole injection layer 142 is 10 nm; second hole transport layer 152 is 15 nm; second electron blocking layer 162 is 10 nm; first light-emitting layer 131 is 25 nm; first hole blocking layer 171 is 5 nm; first electron transport layer 191 is 25 ... emission layer 18 is 15 nm; second hole emission layer 191 is 30 nm; first hole emission layer 111 is 15 nm; second hole emission layer 191 is 30 nm; first hole emission layer 111 is 15 nm; second hole emission layer 191 is 30 nm; first hole emission layer 111 is 15 nm; second hole emission layer 191 is 30 nm; first hole emission layer 111 is 15 nm; second hole emission layer 191 is 30 nm; first hole emission layer 191 is 30 nm; first hole emission layer 191 is 30 nm; first hole emission layer 191 is 30 nm; first hole emission layer 191 is 30 nm; The injection layer 142 is 10 nm; the second hole transport layer 152 is 15 nm; the second electron blocking layer 162 is 10 nm; the first light-emitting layer 131 is 25 nm; the first hole blocking layer 171 is 5 nm; the first electron transport layer 191 is 25 nm; the charge generation layer 18 is 30 nm; the second hole injection layer 142 is 10 nm; the second hole transport layer 152 is 100 nm; the second electron blocking layer 162 is 10 nm; the second light-emitting layer 132 is 30 nm; the second hole blocking layer 172 is 5 nm; the second electron transport layer 192 is 25 nm; the electron injection layer 110 is 1 nm; the second electrode 12 is 12 nm; the light extraction layer 111 is 80 nm; and the light extraction layer 111 is 60 nm.

[0128] Figure 1 The light-emitting device shown includes two stacked light-emitting layers 13, making it a double-layered light-emitting device. Figure 2 and Figure 3 The light-emitting device shown includes three stacked light-emitting layers 13, making it a triple-layered light-emitting device. Figure 4 and Figure 5 The light-emitting device shown includes four stacked light-emitting layers 13, making it a four-layer light-emitting device. Figure 6 The light-emitting device shown includes five stacked light-emitting layers 13, making it a five-layer light-emitting device. Compared to single-layer light-emitting devices, multi-layer light-emitting devices can effectively improve the luminous efficiency of the device.

[0129] Optionally, both the first luminescent material and the second luminescent material include at least one of the following: organic electroluminescent material and quantum dots.

[0130] For example, both the first and second light-emitting materials are organic electroluminescent materials. Accordingly, the light-emitting device is an organic light-emitting diode (OLED).

[0131] For example, both the first and second luminescent materials are quantum dots. Accordingly, the luminescent device is a quantum dot light-emitting diode (QLED).

[0132] Optionally, the first light is blue light, the brightness of the first light emitted by the light-emitting device is the first brightness, the brightness of the total light emitted by the light-emitting device is the second brightness, and the ratio of the first brightness to the second brightness is greater than or equal to 14%.

[0133] By setting the brightness ratio of blue light in the total light to be greater than or equal to 14%, when using this light-emitting device to photoexcite the color conversion material, it is possible to ensure that the brightness ratio of red, green and blue light emitted by the color conversion material can reach 3:6:1, thus meeting the white balance requirements.

[0134] Optionally, the first light is blue light, the spectral intensity of the first light emitted by the light-emitting device is a first intensity, the spectral intensity of the second light emitted by the light-emitting device is a second intensity, the first intensity is greater than or equal to the second intensity, and the second intensity is greater than 0.

[0135] Reference Figure 7 The spectral characteristic curves of several light-emitting devices are schematically shown. Among them, light-emitting device D is a single-layer light-emitting device, including one first light-emitting layer 131; light-emitting device E is a double-layer light-emitting device, including two stacked first light-emitting layers 131; light-emitting device F is as follows... Figure 2 The three-layer light-emitting device shown; light-emitting device G is a three-layer light-emitting device, including a first light-emitting layer 131, a second light-emitting layer 132 and a first light-emitting layer 131 stacked sequentially; light-emitting device H is as follows Figure 4 The four-layer device shown.

[0136] The first light-emitting layer 131 in the aforementioned light-emitting device includes a first light-emitting material. The second light-emitting layer 132 in light-emitting devices F and G includes a second light-emitting material, and the second light-emitting layer 132 in light-emitting device H includes both the first and second light-emitting materials. The first light-emitting material emits blue light, and the second light-emitting material emits green light.

[0137] Since the light-emitting layer 13 in light-emitting device D and light-emitting device E only includes one type of light-emitting material, namely the first light-emitting material, the emitted light of these two light-emitting devices is only the first light, namely blue light. The spectral intensity of the first light is greater than 0, and the spectral intensity of the second light is 0.

[0138] Because the light-emitting layer 13 in light-emitting devices F, G, and H comprises two light-emitting materials, these devices can emit a mixture of the first and second light rays, resulting in a spectral curve with two peaks. Furthermore, as... Figure 7 As shown, the spectral intensity of the first ray, i.e., the blue ray, is greater than the spectral intensity of the second ray, i.e., the green ray, and the spectral intensity of the second ray is greater than 0.

[0139] like Figure 7 The light emitted by the light-emitting device H shown has two peak wavelengths of 453 nm and 523 nm, respectively.

[0140] Furthermore, comparing light-emitting device F and light-emitting device G, it can be seen that the two peaks of light-emitting device F correspond to larger spectral intensities and smaller full width at half maximum (FWHM). This is because the two first emitting layers 131 in light-emitting device F are located on the side of the second emitting layer 132 closer to the first electrode 11, while in light-emitting device G, one first emitting layer 131 is located on the side of the second emitting layer 132 closer to the first electrode 11, and the other first emitting layer 131 is located on the side of the second emitting layer 132 closer to the second electrode 12.

[0141] It should be noted that in actual processes, due to limitations in process conditions or other factors, the similarities among the above-mentioned features may not be completely identical and may have some deviations. Therefore, as long as the similarity relationship between the above-mentioned features roughly meets the above conditions, it is acceptable, and all such similarities fall within the protection scope of this disclosure. For example, the above-mentioned similarities can be those that are permissible within the allowable error range.

[0142] This disclosure also provides a light-emitting substrate, such as Figures 9 to 12 As shown, the light-emitting substrate includes: a first substrate 50, a plurality of switching elements T disposed on the first substrate 50, and a plurality of light-emitting devices 51 connected to the switching elements T as provided in any of the above embodiments.

[0143] Those skilled in the art will understand that this light-emitting substrate has the advantages of the front-emitting device.

[0144] In some embodiments, the light-emitting substrate can be an illumination substrate, in which case the light-emitting substrate serves as a light source to achieve the illumination function. For example, the light-emitting substrate can be a backlight module in a liquid crystal display device, a lamp for internal or external illumination, or various signal lights, etc.

[0145] In other embodiments, the light-emitting substrate can be a display substrate, in which case the light-emitting substrate has the function of displaying images (i.e., screens).

[0146] Optionally, such as Figures 9 to 12As shown, the light-emitting substrate may further include a thin film encapsulation layer 52 disposed on the side of the plurality of light-emitting devices 51 away from the first substrate 50.

[0147] Optionally, the thin film encapsulation layer 52 is projected onto the first substrate 50 and covers the first substrate 50.

[0148] Optionally, such as Figures 9 to 12 As shown, the thin film encapsulation layer 52 may include a first inorganic layer ENL1, an organic layer ENL2, and a second inorganic layer ENL3 stacked together.

[0149] Optionally, such as Figures 9 to 12 As shown, the light-emitting substrate may further include a color conversion layer 53 disposed on the light-emitting side of the light-emitting device 51, for receiving incident light and emitting light of a different color from the incident light, wherein the incident light is the light emitted by the light-emitting device 51.

[0150] When the light-emitting substrate includes the aforementioned thin-film encapsulation layer 52 and color conversion layer 53, the color conversion layer 53 is located on the side of the thin-film encapsulation layer 52 that faces away from the first substrate 50, such as... Figures 9 to 12 As shown.

[0151] Optionally, such as Figure 13 As shown, the light-emitting substrate includes an effective light-emitting area DA and a border area NDA located on at least one side of the effective light-emitting area. The effective light-emitting area DA may include multiple pixels.

[0152] Reference Figures 9 to 12 This diagram shows a cross-sectional view of a pixel within the effective light-emitting area (DA). Figures 9 to 12 As shown, each pixel includes a red sub-pixel R, a blue sub-pixel B, and at least one green sub-pixel G, wherein the at least one green sub-pixel G includes a first green sub-pixel G1 and / or a second green sub-pixel G2.

[0153] like Figures 9 to 12 As shown, the multiple light-emitting devices 51 may include a first light-emitting device LD1 located in the red sub-pixel R, a second light-emitting device LD2 located in the green sub-pixel G, and a third light-emitting device LD3 located in the blue sub-pixel B. Sub-pixels and light-emitting devices 51 can be configured in a one-to-one correspondence.

[0154] Optionally, the incident light includes blue light and a first green light.

[0155] Optionally, such as Figures 9 to 12 As shown, the color conversion layer 53 may include: a first color conversion pattern CCP1, located in the red sub-pixel R, for emitting red light when excited by incident light.

[0156] The orthographic projection of the first color conversion pattern CCP1 on the first substrate 50 can cover the orthographic projection of the light-emitting area (the opening area shown in the figure) of the first light-emitting device LD1 on the first substrate 50.

[0157] Optionally, such as Figures 9 to 12 As shown, the color conversion layer 53 may further include: a second color conversion pattern CCP2 located in the first green sub-pixel G1, for emitting a second green light under the excitation of incident light.

[0158] The orthographic projection of the second color conversion pattern CCP2 on the first substrate 50 can cover the orthographic projection of the light-emitting area (the opening area shown in the figure) of the second light-emitting device LD2 on the first substrate 50.

[0159] Optionally, such as Figures 9 to 12 As shown, the color conversion layer 53 may further include: a first transmission pattern TP1 located in the second green sub-pixel G2, used to transmit incident light.

[0160] The orthographic projection of the first transmission pattern TP1 on the first substrate 50 can cover the orthographic projection of the light-emitting area (the opening area shown in the figure) of the second light-emitting device LD2 on the first substrate 50.

[0161] Optionally, such as Figures 9 to 12 As shown, the color conversion layer 53 may further include: a second transmission pattern TP2, located in the blue sub-pixel B, for transmitting incident light.

[0162] The orthographic projection of the second transmission pattern TP2 on the first substrate 50 can cover the orthographic projection of the light-emitting area (opening area as shown in the figure) of the third light-emitting device LD3 on the first substrate 50.

[0163] In the first example, such as Figure 9 or Figure 12 As shown, a pixel includes a red sub-pixel R, a blue sub-pixel B, and a green sub-pixel G, namely the second green sub-pixel G2.

[0164] Accordingly, the color conversion layer 53 includes: a first color conversion pattern CCP1 located in the red sub-pixel R, a first transmission pattern TP1 located in the second green sub-pixel G2, and a second transmission pattern TP2 located in the blue sub-pixel B.

[0165] Since the incident light contains a first green light, and this first green light is transmitted through the first transmission pattern TP1 located in the green sub-pixel G, the green sub-pixel G can emit green light. Therefore, there is no need to set a color conversion pattern in the green sub-pixel G, which simplifies the process and saves process time.

[0166] In this example, the orthogonal projection of the color conversion layer 53 onto the first substrate 50 can also be non-overlapping with the second green sub-pixel G2 and the blue sub-pixel B, thereby further simplifying the process and saving process time.

[0167] In the second example, such as Figure 10 As shown, a pixel includes a red sub-pixel R, a blue sub-pixel B, and a green sub-pixel G, namely the first green sub-pixel G1.

[0168] Accordingly, the color conversion layer 53 includes: a first color conversion pattern CCP1 located in the red sub-pixel R, a second color conversion pattern CCP2 located in the first green sub-pixel G1, and a second transmission pattern TP2 located in the blue sub-pixel B.

[0169] In this example, by setting a second color conversion pattern CCP2 in the green sub-pixel G, the blue light in the incident light can be converted into a second green light, thereby improving the brightness conversion rate of the incident light.

[0170] Optionally, such as Figure 10 As shown, the thickness of the second color conversion pattern CCP2 is less than the thickness of the first color conversion pattern CCP1.

[0171] To extend the propagation path of blue light and improve the brightness conversion rate, scattering particles can be doped into the second color conversion pattern CCP2. However, the presence of scattering particles reduces the transmittance of the first green light in the incident light. By setting a thinner second color conversion pattern CCP2, the scattering rate of the second color conversion pattern CCP2 on the first green light can be reduced, thereby improving the transmittance of the first green light.

[0172] For example, the thickness of the first color conversion pattern CCP1 is greater than or equal to 10 micrometers, and the thickness of the second color conversion pattern CCP2 is less than or equal to 10 micrometers.

[0173] Optionally, the first color conversion pattern CCP1 is doped with a first scattering particle SP1, and the second color conversion pattern CCP2 is doped with a second scattering particle SP2; the doping ratio of the first scattering particle SP1 in the first color conversion pattern CCP1 is greater than or equal to the doping ratio of the second scattering particle SP2 in the second color conversion pattern CCP2.

[0174] By reducing the doping ratio of the second scattering particles SP2 in the second color conversion pattern CCP2, the scattering rate of the second color conversion pattern CCP2 to the first green light can be reduced, thereby increasing the transmittance of the first green light.

[0175] In the specific implementation, by adjusting the thickness of the second color conversion pattern CCP2 and the doping ratio of the second scattering particles SP2, the following inequality is made to hold:

[0176] (γ BG *x%+(1-x%)*γ G1 >(1-x%)*γ G2 .

[0177] Among them, the light emitted by the light-emitting device 51 is the incident light, x% is the proportion of blue light in the incident light, 1-x% is the proportion of the first green light in the incident light, and γ BG γ represents the conversion rate of blue light to second green light after passing through the first green sub-pixel G1. G1 γ represents the transmittance of the first green light ray through the first green sub-pixel G1. G2 The transmittance of the first green light rays through the second green sub-pixel G2.

[0178] In the above inequality, the left side represents the luminous efficiency of the first green sub-pixel G1, and the right side represents the luminous efficiency of the second green sub-pixel G2. When the thickness of the second color conversion pattern CCP2 and the doping ratio of the second scattering particles SP2 are adjusted to make the above inequality true, the luminous efficiency of the first green sub-pixel G1 can be greater than that of the second green sub-pixel G2.

[0179] Optionally, the absolute value of the difference between the center wavelength of the first green light and the center wavelength of the second green light is less than or equal to 5 nanometers. This ensures that the center wavelengths of the first and second green lights substantially overlap, thereby improving the color purity of the green light.

[0180] Optionally, the absolute value of the difference between the peak wavelength of the first green light and the peak wavelength of the second green light is less than or equal to 5 nanometers. This ensures that the peak wavelengths of the first and second green lights substantially overlap, thereby improving the color purity of the green light.

[0181] In the third example, such as Figure 11 As shown, a pixel includes a red sub-pixel R, a blue sub-pixel B, and two green sub-pixels G, namely the first green sub-pixel G1 and the second green sub-pixel G2.

[0182] Accordingly, the color conversion layer 53 includes: a first color conversion pattern CCP1 located in the red sub-pixel R, a second color conversion pattern CCP2 located in the first green sub-pixel G1, a first transmission pattern TP1 located in the second green sub-pixel G2, and a second transmission pattern TP2 located in the blue sub-pixel B.

[0183] By setting the first green sub-pixel G1, the color gamut can be improved, the peak position of the green light emitted by the green sub-pixel G can be modified, the full width at half maximum (FWHM) can be reduced, and the color purity can be improved. In addition, by setting the second green sub-pixel G2, the brightness of the green sub-pixel G can be significantly improved.

[0184] For example, such as Figures 9 to 12 As shown, the color conversion layer 53 includes a partition wall PW and a plurality of color conversion patterns located within a plurality of openings defined by the partition wall PW. The plurality of color conversion patterns may include at least one of the following: a first color conversion pattern CCP1, a second color conversion pattern CCP2, a first transmission pattern TP1, and a second transmission pattern TP2.

[0185] The first color conversion pattern CCP1 emits light by converting or shifting the peak wavelength of the incident light to another specific peak wavelength. The first color conversion pattern CCP1 can convert the emitted light L provided by the first light-emitting device LD1 into red light with a peak wavelength in the range of approximately 610 nm to approximately 650 nm. (Refer to...) Figure 14 The first color conversion pattern CCP1 may include a first base resin R1 and a first color conversion material QD1 dispersed in the first base resin R1, and may include first scattering particles SP1 dispersed in the first base resin R1.

[0186] The second color conversion pattern CCP2 emits light by converting or shifting the peak wavelength of the incident light to another specific peak wavelength. The second color conversion pattern CCP2 can convert the emitted light L provided by the second light-emitting device LD2 into green light with a peak wavelength in the range of approximately 510 nm to approximately 550 nm. (See reference...) Figure 15 The second color conversion pattern CCP2 may include a second base resin R2 and a second color conversion material QD2 dispersed in the second base resin R2, and may include second scattering particles SP2 dispersed in the second base resin R2.

[0187] The first transmission pattern TP1 can transmit incident light, for example, it has a transmittance of over 90% for the peak wavelength of the incident light. The first transmission pattern TP1 can also transmit emitted light L provided by the second light-emitting device LD2. (Refer to...) Figure 16 The first transmission pattern TP1 may include a third base resin R3 and third scattering particles SP3 dispersed in the third base resin R3. The setting of the third scattering particles SP3 can expand the viewing angle range of the incident light and improve the viewing angle uniformity between the red sub-pixel R and the green sub-pixel G.

[0188] The second transmission pattern TP2 can transmit incident light, for example, having a transmittance of over 90% for the peak wavelength of the incident light. The second transmission pattern TP2 can also transmit the emitted light L provided by the third light-emitting device LD3. (Refer to...) Figure 17 The second transmission pattern TP2 may include a fourth base resin R4 and fourth scattering particles SP4 dispersed in the fourth base resin R4. The arrangement of the fourth scattering particles SP4 can expand the viewing angle range of the incident light and improve the viewing angle uniformity between the red sub-pixel R and the blue sub-pixel B.

[0189] The first color conversion material QD1 and the second color conversion material QD2 may comprise semiconductor nanocrystal materials that can emit light of a specific color when electrons transition from the conduction band to the valence band. Quantum dots can have any shape, provided that such shape is commonly used in the art, and specifically may be spherical, conical, multi-armed, or cubic nanoparticles, or may be nanotubes, nanowires, nanofibers, or nanoparticles, etc.

[0190] In some embodiments, quantum dots may have a core-shell structure, comprising a core material and a shell material; the core-shell structure includes a nanocrystal core and a shell surrounding the core. The shell of the quantum dot can serve as a protective layer to prevent chemical modification of the core and maintain semiconductor properties, and / or as a charging layer to apply electrophoretic properties to the quantum dot. The shell can have a monolayer or multilayer structure. The interface between the core and the shell can have a concentration gradient in which the concentration of the elements in the shell decreases toward the center of the core. The core of the quantum dot can be selected from the group consisting of: group II-VI compounds, group III-V compounds, group IV-VI compounds, group IV elements, group IV compounds, and combinations thereof. The shell of the quantum dot can include oxides of metallic or non-metallic materials, semiconductor compounds, or combinations thereof. A transition material can be added between the core material and the shell material to achieve a gradual transition of the crystal lattice, effectively reducing the internal pressure caused by lattice defects in the quantum dot, thereby further improving the luminescence efficiency and stability of the quantum dot.

[0191] In some embodiments, the group II-VI compounds may be selected from the group consisting of: CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and binary compounds selected from the group consisting of mixtures thereof; AgInS, CuInS, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, C dZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and ternary compounds selected from mixtures thereof; and quaternary compounds selected from mixtures thereof.

[0192] In some embodiments, the III-V compounds may be selected from the group consisting of: binary compounds of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; ternary compounds of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InNAs, InNP, InNAs, InNSb, InPAs, InPSb, and mixtures thereof; and quaternary compounds of GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof.

[0193] In some embodiments, the III-V compounds may be selected from the group consisting of: binary compounds of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, and mixtures thereof; ternary compounds of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InNAs, InNP, InNAs, InNSb, InPAs, InPSb, and mixtures thereof; and quaternary compounds of GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, and mixtures thereof.

[0194] In some embodiments, the transition material can be a ternary alloy. By controlling the optical properties of quantum dots using ternary alloys, quantum dots with uniform volume but different emission frequencies can be formed, thereby improving the color gamut coverage of the display device.

[0195] In some embodiments, the core material of the quantum dot includes CdSe and / or InP, and the shell material includes ZnS. Taking InP as an example: surface defects of InP quantum dots form surface trap states. By coating the surface of InP quantum dots with ZnS, a core-shell structure with InP as the core material and ZnS as the shell material is formed, which can reduce the surface defects of the quantum dots and optimize the luminescence efficiency and stability of the quantum dots. The above is only an example of InP as the core material. The same rules apply when the core material includes CdSe, or when the core material includes both CdSe and InP.

[0196] In some embodiments, quantum dots (QDs) do not include cadmium (Cd). For example, the core material of the QD is InP and the shell material is a stack of ZnSe / ZnS; or for example, the core material of the QD is ZnTeSe and the shell material is ZnSe / ZnS.

[0197] Quantum dots can have a size smaller than 45 nanometers (nm), for example, 40nm, 30nm, 20nm or smaller. In some embodiments, the size of the quantum dots is 4nm to 20nm, exemplarily 4nm, 5nm, 7nm, 10nm, 13nm, 17nm or 20nm. The color of the emitted light can be adjusted according to the size of the quantum dots, and therefore quantum dots can emit various colors of light, such as blue light, red light, green light, etc. The size of red quantum dots and green quantum dots can be different.

[0198] Among them, the first color conversion material QD1 and the second color conversion material QD2 are not limited to the quantum dot materials mentioned above. The first color conversion material QD1 and the second color conversion material QD2 can also be one or more of the color conversion materials such as quantum dots, rare earth materials, fluorescent materials and organic dyes.

[0199] Quantum dot materials, as a novel type of luminescent material, possess advantages such as concentrated emission spectrum, high color gamut, high color purity, and the ability to easily adjust the emission color through the size, structure, or composition of the quantum dot material. In practical applications, quantum dot ink undergoes solution processing, spin coating, or inkjet printing, followed by further curing to form a quantum dot film layer, which can be used as a luminescent material for solid-state lighting and flat panel displays.

[0200] When the light-emitting device is an OLED and the color conversion layer 53 is made of quantum dot material, it is possible to combine the pixel-level control of OLED with the color enhancement characteristics of quantum dots, thereby obtaining better display characteristics, reducing power consumption, and extending the lifespan of the light-emitting substrate. In addition, during the fabrication of multiple light-emitting devices 51, the light-emitting layers 13 located in different sub-pixels can be formed on the entire surface. For example, an open mask can be used to simultaneously form the light-emitting layers 13 located in different sub-pixels, thereby simplifying the fabrication process.

[0201] Optionally, such as Figures 9 to 12 As shown, the above-mentioned light-emitting device also includes a color filter layer 54, which is disposed on the light-emitting side of the color conversion layer 53.

[0202] Optionally, such as Figures 9 to 12 As shown, the color filter layer 54 includes: a first color filter pattern CF1, located in the red sub-pixel R, for transmitting red light incident on the first color filter pattern CF1.

[0203] Optionally, such as Figures 9 to 12 As shown, the color filter layer 54 includes: a second color filter pattern CF2 located in the green sub-pixel G, used to transmit green light incident on the second color filter pattern CF2.

[0204] Optionally, such as Figures 9 to 12As shown, the color filter layer 54 includes a third color filter pattern CF3 located in the blue sub-pixel B, which is used to transmit blue light incident on the third color filter pattern CF3.

[0205] In the specific implementation, refer to Figures 9 to 11 Multiple switching elements T, a planarization layer PLN, a first electrode 11, a pixel definition layer PDL, at least one light-emitting layer 13, a second electrode 12, a thin-film encapsulation layer 52, a color conversion layer 53, and a color filter layer 54 can be sequentially formed on the first substrate 50 to obtain... Figures 9 to 11 The light-emitting substrate shown.

[0206] Optionally, such as Figure 12 As shown, the above-mentioned light-emitting device further includes: a second substrate 55 disposed on the side of the color filter layer 54 away from the color conversion layer 53; and a filler layer FL disposed between the thin film encapsulation layer 52 and the color conversion layer 53 for bonding the thin film encapsulation layer 52 and the color conversion layer 53.

[0207] The thin-film encapsulation layer 52 is located between the multiple light-emitting devices 51 and the color conversion layer 53.

[0208] In a specific implementation, multiple switching elements T, a planarization layer PLN, a first electrode 11, a pixel definition layer PDL, at least one light-emitting layer 13, a second electrode 12, and a thin-film encapsulation layer 52 can be sequentially formed on the first substrate 50 to obtain... Figure 12 The light-emitting substrate shown is substrate LS; a color filter layer 54 and a color conversion layer 53 are sequentially formed on the second substrate 55 to obtain... Figure 12 The light-emitting substrate shown is a substrate CS; then, a filler layer FL can be used to bond substrates LS and CS together. The filler layer FL is located between the thin film encapsulation layer 52 and the color conversion layer 53, resulting in... Figure 12 The light-emitting substrate shown.

[0209] To achieve white balance, the ratio of red light intensity to green light intensity to blue light intensity must be 3:6:1.

[0210] In some illustrative embodiments, the luminous efficacy of the light-emitting device emitting blue light is CE. B The luminous efficacy of the light-emitting device emitting the first green light is CE. G .

[0211] The conversion rate of blue light to red light after passing through the red sub-pixel R is γ. BR The conversion rate of the first green ray to red ray after passing through the red sub-pixel R is γ. GR The conversion rate of blue light to second green light after passing through the first green sub-pixel G1 is γ. BGThe transmittance of the first green light ray passing through the first green sub-pixel G1 is γ. G1 The transmittance of the first green light ray passing through the second green sub-pixel G2 is γ. G2 The transmittance of blue light passing through blue sub-pixel B is γ. B .

[0212] Based on the above parameters, the luminous efficiency of the red sub-pixel R can be calculated as: P R =CE G *γ GR +CE B *γ BR The luminous efficiency of the first green sub-pixel G1 is: P G1 =CE G *γ G1 +CE B *γ BG The luminous efficiency of the second green sub-pixel G2 is: P G2 =CE G *γ G2 The luminous efficiency of the blue sub-pixel B is: P B =CE B *γ B .

[0213] The total luminous efficiency of the green sub-pixel G is: P G =a*P G1 +b*P G2 =a*(CE) G *γ G1 +CE B *γ BG )+b*(CE G *γ G2 When a pixel includes the first green sub-pixel G1, a = 1; otherwise, a = 0. When a pixel includes the second green sub-pixel G2, b = 1; otherwise, b = 0.

[0214] In order for the light-emitting substrate provided in this disclosure to achieve white balance, the above parameters can satisfy the following relationship: P R :P G :P B = (3 / Ar):(6 / Ag):(1 / Ab). Where Ar is the aperture ratio of the red sub-pixel R, Ag is the aperture ratio of the green sub-pixel G, and Ab is the aperture ratio of the blue sub-pixel B.

[0215] Among them, according to P G :P B =(6 / Ag):(1 / Ab), the luminous efficiency of the light-emitting device emitting the first green light is CE G The luminous efficacy of emitting blue light is CE BThe following relationship must be satisfied:

[0216] When a pixel includes a red sub-pixel R, a blue sub-pixel B, and a first green sub-pixel G1, such as Figure 10 As shown, the relationship that needs to be satisfied to achieve white balance is: P G1 :P B =(CE G *γ G1 +CE B *γ BG ):CE B *γ B =(6 / Ag):(1 / Ab);

[0217] When a pixel includes a red sub-pixel R, a blue sub-pixel B, and a second green sub-pixel G2, such as Figure 9 or Figure 12 As shown, the relationship that needs to be satisfied to achieve white balance is: P G2 :P B =CE G *γ G2 :CE B *γ B =(6 / Ag):(1 / Ab);

[0218] When a pixel includes a red sub-pixel R, a blue sub-pixel B, a first green sub-pixel G1, and a second green sub-pixel G2, such as Figure 11 As shown, the relationship that needs to be satisfied to achieve white balance is:

[0219] P G :P B =(CE G *γ G1 +CE B *γ BG +CE G *γ G2 ):CE B *γ B =(6 / Ag):(1 / Ab).

[0220] In some illustrative embodiments, the light emitted by the light-emitting device 51 is incident light, the brightness of the incident light is L, x% is the proportion of blue light in the incident light, 1-x% is the proportion of the first green light in the incident light, and γ BG γ represents the conversion rate of blue light to second green light after passing through the first green sub-pixel G1. G1 γ represents the transmittance of the first green light ray through the first green sub-pixel G1. G2 γ represents the transmittance of the first green ray through the second green sub-pixel G2. G2 It can be approximated as the transmittance of the second color filter pattern CF2.

[0221] When a pixel includes a red sub-pixel R, a blue sub-pixel B, and a first green sub-pixel G1, such as Figure 10 As shown, the brightness of the first green sub-pixel G1 is: x%*L*γ BG +(1-x%)*L*γ G1 ;

[0222] When a pixel includes a red sub-pixel R, a blue sub-pixel B, and a second green sub-pixel G2, such as Figure 9 or Figure 12 As shown, the brightness of the second green sub-pixel G2 is: (1-x%)*L*γ G2 ;

[0223] When a pixel includes a red sub-pixel R, a blue sub-pixel B, a first green sub-pixel G1, and a second green sub-pixel G2, such as Figure 11 As shown, the brightness of the green sub-pixel G is the sum of the brightness of the first green sub-pixel G1 and the second green sub-pixel G2, that is: x% * L * γ BG +(1-x%)*L*γ G1 +(1-x%)*L*γ G2 .

[0224] Figure 8 The luminous efficiency test results of several light-emitting devices at different sub-pixels are schematically shown. Figure 8 In the diagram, the white-filled bars represent the luminous efficiency of the light-emitting device itself, the dot-filled bars represent the luminous efficiency of the light emitted by the light-emitting device after passing through the first green sub-pixel G1, and the line-filled bars represent the luminous efficiency of the light emitted by the light-emitting device after passing through the red sub-pixel R.

[0225] like Figure 8 As shown, since the light-emitting layer 13 in light-emitting devices D and E only includes one type of light-emitting material, namely the first light-emitting material, the light-emitting efficiency of the light-emitting device itself, as well as the light-emitting efficiency after passing through the first green sub-pixel G1 or the red sub-pixel R, is lower than that of light-emitting devices F and G.

[0226] Furthermore, comparing light-emitting device F and light-emitting device G, light-emitting device F is superior to light-emitting device G in terms of both its own luminous efficiency and the luminous efficiency after passing through the first green sub-pixel G1 or red sub-pixel R.

[0227] This disclosure also provides a light-emitting device, including: a light-emitting substrate as described in any embodiment; a driving integrated circuit configured to provide a driving signal to the light-emitting substrate; and a power supply circuit configured to provide power to the light-emitting substrate.

[0228] Those skilled in the art will understand that this light-emitting device has the advantages of a front-emitting substrate.

[0229] The light-emitting device can be a display or a product containing a display. The display can be a flat panel display (FPD), a microdisplay, etc. Based on whether the user can see the back of the display, the display can be a transparent display or an opaque display. Based on whether the display can be bent or rolled, the display can be a flexible display or a regular display (which can be called a rigid display). For example, products containing a display can include: computers, televisions, billboards, laser printers with display functions, telephones, mobile phones, electronic paper, personal digital assistants (PDAs), laptops, digital cameras, tablets, laptops, navigators, portable camcorders, viewfinders, vehicles, large walls, theater screens, or stadium signs, etc.

[0230] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0231] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0232] The above provides a detailed description of a light-emitting device, a light-emitting substrate, and a light-emitting apparatus provided by this disclosure. Specific examples have been used to illustrate the principles and implementation methods of this disclosure. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this disclosure. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this disclosure. Therefore, the content of this specification should not be construed as a limitation of this disclosure.

[0233] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0234] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

[0235] The terms "an embodiment," "embodiment," or "one or more embodiments" as used herein mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this disclosure. Furthermore, please note that the examples of the phrase "in one embodiment" do not necessarily all refer to the same embodiment.

[0236] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this disclosure may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0237] In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This disclosure can be implemented by means of hardware comprising a plurality of different elements and by means of a suitably programmed computer. In a unit claim enumerating a plurality of means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

[0238] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A light-emitting substrate, comprising: First substrate; Multiple switching elements disposed on the first substrate; A plurality of light-emitting devices connected to the switching element; wherein each light-emitting device includes: a first electrode; a second electrode disposed opposite to the first electrode; and at least one light-emitting layer stacked between the first electrode and the second electrode; the at least one light-emitting layer includes: a first light-emitting material configured to emit a first light ray under the drive of current or voltage; and a second light-emitting material configured to emit a second light ray under the drive of current or voltage; wherein the first light ray and the second light ray are of different colors; the first light ray is blue light, and the second light ray is first green light; A color conversion layer is disposed on the light-emitting side of the light-emitting device for receiving incident light and emitting light of a different color from the incident light, wherein the incident light is the light emitted by the light-emitting device; wherein the light-emitting substrate includes a plurality of pixels, each pixel including a red sub-pixel, a blue sub-pixel, and at least one green sub-pixel, the at least one green sub-pixel including a first green sub-pixel and a second green sub-pixel; the color conversion layer includes: a first color conversion pattern located on the red sub-pixel for emitting red light under the excitation of the incident light; a second color conversion pattern located on the first green sub-pixel for emitting second green light under the excitation of the incident light; a first transmission pattern located on the second green sub-pixel for transmitting the incident light; a second transmission pattern located on the blue sub-pixel for transmitting the incident light; and A color filter layer is disposed on the light-emitting side of the color conversion layer; wherein the color filter layer includes: a first color filter pattern located on the red sub-pixel for transmitting red light incident on the first color filter pattern; a second color filter pattern located on the at least one green sub-pixel for transmitting green light incident on the second color filter pattern; and a third color filter pattern located on the blue sub-pixel for transmitting blue light incident on the third color filter pattern. Wherein, the absolute value of the difference between the center wavelength of the first green light and the center wavelength of the second green light is less than or equal to 5 nanometers; the brightness of the first light emitted by the light-emitting device is the first brightness, the brightness of the total light emitted by the light-emitting device is the second brightness, and the ratio of the first brightness to the second brightness is greater than or equal to 14%.

2. The light-emitting substrate according to claim 1, further comprising: A thin-film encapsulation layer is disposed on the side of the light-emitting device away from the first substrate, and the orthographic projection of the thin-film encapsulation layer on the first substrate covers the first substrate.

3. The light-emitting substrate according to claim 1, wherein, The thickness of the second color conversion pattern is less than the thickness of the first color conversion pattern.

4. The light-emitting substrate according to claim 1, wherein, The first color conversion pattern is doped with a first scattering particle, and the second color conversion pattern is doped with a second scattering particle; the doping ratio of the first scattering particle in the first color conversion pattern is greater than or equal to the doping ratio of the second scattering particle in the second color conversion pattern.

5. The light-emitting substrate according to claim 1, wherein, The absolute value of the difference between the peak wavelength of the first green light and the peak wavelength of the second green light is less than or equal to 5 nanometers.

6. The light-emitting substrate according to any one of claims 1 to 5, wherein, The color conversion layer includes a color conversion material, which includes at least one of the following: quantum dots, rare earth materials, fluorescent materials, and organic dyes.

7. The light-emitting substrate according to claim 1, further comprising: The second substrate is disposed on the side of the color filter layer opposite to the color conversion layer; as well as A filler layer is disposed between the thin-film encapsulation layer and the color conversion layer for bonding the thin-film encapsulation layer and the color conversion layer; wherein the thin-film encapsulation layer is located between the light-emitting device and the color conversion layer.

8. The light-emitting substrate according to any one of claims 1-5, 7, wherein, The wavelength of the first light is greater than or equal to 440 nanometers and less than or equal to 490 nanometers.

9. The light-emitting substrate according to any one of claims 1-5 and 7, wherein, The at least one light-emitting layer includes at least one first light-emitting layer and at least one second light-emitting layer; Wherein, the first light-emitting layer includes the first light-emitting material; The second light-emitting layer includes the second light-emitting material, or the second light-emitting layer includes the first light-emitting material and the second light-emitting material.

10. The light-emitting substrate according to claim 9, wherein, The first electrode is a reflective electrode, and the second electrode is a transmissive electrode or a semi-transmissive electrode; The luminous efficiency of the first luminescent material is less than or equal to that of the second luminescent material, and the first luminescent layer is located on the side of the second luminescent layer closer to the first electrode.

11. The light-emitting substrate according to claim 9, wherein, The at least one first light-emitting layer is located on the side of the at least one second light-emitting layer that is close to the first electrode.

12. The light-emitting substrate according to claim 9, wherein, The first electrode is an anode, the second electrode is a cathode, and the light-emitting device further includes at least one of the following: A first hole injection layer, a first hole transport layer, and a first electron blocking layer are stacked between the first electrode and the at least one light-emitting layer, wherein the first hole injection layer is disposed close to the first electrode; A first hole blocking layer, a first electron transport layer, a charge generation layer, a second hole injection layer, a second hole transport layer, and a second electron blocking layer are stacked between two adjacent light-emitting layers, with the first hole blocking layer disposed close to the first electrode. A second hole-blocking layer, a second electron transport layer, and an electron injection layer are stacked between the at least one light-emitting layer and the second electrode, wherein the electron injection layer is disposed close to the second electrode; and A light extraction layer is provided on the side of the second electrode opposite to the first electrode.

13. The light-emitting substrate according to any one of claims 1-5, 7, wherein, Both the first luminescent material and the second luminescent material include at least one of the following: organic electroluminescent material and quantum dots.

14. The light-emitting substrate according to any one of claims 1-5, 7, wherein, The spectral intensity of the first light emitted by the light-emitting device is a first intensity, and the spectral intensity of the second light emitted by the light-emitting device is a second intensity. The first intensity is greater than or equal to the second intensity, and the second intensity is greater than 0.

15. A light-emitting device, comprising: The light-emitting substrate as described in any one of claims 1 to 14; A driver integrated circuit is configured to provide a driving signal to the light-emitting substrate; as well as A power supply circuit is configured to provide power to the light-emitting substrate.

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