CN107302017A - Organic light-emitting display panel and device - Google Patents
Organic light-emitting display panel and device Download PDFInfo
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- CN107302017A CN107302017A CN201710692166.8A CN201710692166A CN107302017A CN 107302017 A CN107302017 A CN 107302017A CN 201710692166 A CN201710692166 A CN 201710692166A CN 107302017 A CN107302017 A CN 107302017A
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- 239000000463 material Substances 0.000 claims abstract description 90
- 239000002096 quantum dot Substances 0.000 claims abstract description 76
- 238000002347 injection Methods 0.000 claims description 23
- 239000007924 injection Substances 0.000 claims description 23
- 230000005525 hole transport Effects 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910001218 Gallium arsenide Inorganic materials 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 229910017115 AlSb Inorganic materials 0.000 claims description 2
- 229910004613 CdTe Inorganic materials 0.000 claims description 2
- 229910005540 GaP Inorganic materials 0.000 claims description 2
- 229910005542 GaSb Inorganic materials 0.000 claims description 2
- -1 HgSe Inorganic materials 0.000 claims description 2
- 229910004262 HgTe Inorganic materials 0.000 claims description 2
- 229910000673 Indium arsenide Inorganic materials 0.000 claims description 2
- GPXJNWSHGFTCBW-UHFFFAOYSA-N Indium phosphide Chemical compound [In]#P GPXJNWSHGFTCBW-UHFFFAOYSA-N 0.000 claims description 2
- 229910007709 ZnTe Inorganic materials 0.000 claims description 2
- UHYPYGJEEGLRJD-UHFFFAOYSA-N cadmium(2+);selenium(2-) Chemical compound [Se-2].[Cd+2] UHYPYGJEEGLRJD-UHFFFAOYSA-N 0.000 claims description 2
- 229910052956 cinnabar Inorganic materials 0.000 claims description 2
- WPYVAWXEWQSOGY-UHFFFAOYSA-N indium antimonide Chemical compound [Sb]#[In] WPYVAWXEWQSOGY-UHFFFAOYSA-N 0.000 claims description 2
- RPQDHPTXJYYUPQ-UHFFFAOYSA-N indium arsenide Chemical compound [In]#[As] RPQDHPTXJYYUPQ-UHFFFAOYSA-N 0.000 claims description 2
- SBIBMFFZSBJNJF-UHFFFAOYSA-N selenium;zinc Chemical compound [Se]=[Zn] SBIBMFFZSBJNJF-UHFFFAOYSA-N 0.000 claims description 2
- 239000003086 colorant Substances 0.000 abstract description 12
- 230000005540 biological transmission Effects 0.000 abstract description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000004984 smart glass Substances 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/115—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising active inorganic nanostructures, e.g. luminescent quantum dots
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- Crystallography & Structural Chemistry (AREA)
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The embodiment of the invention provides an organic light-emitting display panel and a device, quantum dots are doped in a structural layer of an organic light-emitting device, so that light emitted by a light-emitting layer can be converted into light with a color corresponding to the organic light-emitting device under the condition of not increasing the film thickness of each structural layer, the display panel can emit light with various colors through each organic light-emitting device, and the transmission of electrons and/or holes can not be influenced without increasing the film thickness of each structural layer, so that the light-emitting efficiency and the light-emitting brightness of the light-emitting layer can not be influenced; in addition, in the organic light emitting display panel, the difference between the service lives of the light emitting materials in any two organic light emitting devices is small, and the difference is not larger than the preset threshold, so that after the organic light emitting display panel is used for a period of time, the attenuation degree of the light emitting brightness of each light emitting material is not large, the light emitting brightness difference of each light emitting material is small, and the problem of color cast is relieved to a certain extent.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of organic light emitting display technologies, and in particular, to an organic light emitting display panel and an organic light emitting display device.
[ background of the invention ]
The organic light emitting display panel has a self-luminous property, has the advantages of fast response, being lighter and thinner, having a wide viewing angle, having low power consumption, and the like, compared with liquid crystal display, and is receiving more and more attention from the market.
At present, a plurality of organic light emitting devices respectively emitting red light, green light and blue light are generally disposed in an organic light emitting display panel, wherein light emitting materials for emitting light of colors corresponding to the organic light emitting devices are disposed in light emitting layers of different organic light emitting devices, and the colors of the light emitted by the organic light emitting display panel can be adjusted by adjusting the luminance of the organic light emitting devices emitting red light, green light and blue light, for example, the luminance of the organic light emitting devices emitting red light, green light and blue light is set to a certain luminance, and the organic light emitting display panel emits white light.
The color of light emitted from the organic light emitting display panel is related to the luminance of the organic light emitting devices emitting red, green, and blue light. Wherein the lifetimes of different luminescent materials are different. If the life of the luminescent material in each organic light emitting device in the organic light emitting display panel is greatly different, that is, the attenuation speed of the luminescent brightness of different luminescent materials is greatly different, after the organic light emitting display panel is used for a period of time, the attenuation condition of the luminescent brightness of different luminescent materials is greatly different, the attenuation condition of the luminescent brightness of some luminescent materials is greatly different, and the attenuation condition of some luminescent materials is small, so that the brightness difference between different luminescent materials is large, and the color cast condition of the display panel is caused when the display panel emits light.
[ summary of the invention ]
Embodiments of the present invention provide an organic light emitting display panel and an organic light emitting display device, so as to solve the problem that a color shift occurs after the organic light emitting display panel in the prior art is used for a period of time.
In one aspect, an embodiment of the present invention provides an organic light emitting display panel, including a substrate base plate, and a plurality of organic light emitting devices disposed on the substrate base plate; the plurality of organic light emitting devices includes a plurality of first organic light emitting devices for emitting light having a first color, a plurality of second organic light emitting devices for emitting light having a second color, and a plurality of third organic light emitting devices for emitting light having a third color;
at least one of the first organic light emitting device, the second organic light emitting device and the third organic light emitting device comprises a structural layer doped with quantum dots, the structural layer is positioned on the light emitting side of the light emitting layer, and the quantum dots are used for converting light emitted by the light emitting layer into light with a color corresponding to the organic light emitting device;
the light emitting layers of each two organic light emitting devices in the organic light emitting devices have a difference in lifetime of the light emitting materials not greater than a preset threshold.
In another aspect, an embodiment of the present invention provides an organic light emitting display device, which includes the organic light emitting display panel.
One of the above technical solutions has the following beneficial effects:
firstly, doping quantum dots in a structural layer of an organic light emitting device can convert light emitted by a light emitting layer into light of a color corresponding to the organic light emitting device without changing the film thickness of each structural layer, namely, without increasing the film thickness of each structural layer, so that a display panel can emit light of various colors through each organic light emitting device, and it should be noted that the transmission of electrons and/or holes can not be influenced without increasing the film thickness of each structural layer, and further the light emitting efficiency and the light emitting brightness of the light emitting layer can not be influenced; secondly, in the organic light emitting display panel, the difference between the service lives of the light emitting materials in any two organic light emitting devices is small and is not larger than the preset threshold, so that after the organic light emitting display panel is used for a period of time, the attenuation degrees of the light emitting brightness of each light emitting material are not large, the light emitting brightness difference of each light emitting material is small, and the problem of color cast is relieved to a certain extent.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic cross-sectional view of an organic light emitting display panel according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of another organic light emitting display panel according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view of another organic light emitting display panel according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional view of another organic light emitting display panel according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional view of another organic light emitting display panel according to an embodiment of the present invention;
fig. 6 is a top view of an organic light emitting display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
In order to solve the problem of color shift of an organic light emitting display panel after being used for a period of time in the prior art, an embodiment of the present invention provides an organic light emitting display panel 10, and specifically, as shown in fig. 1, fig. 1 is a cross-sectional view of an organic light emitting display panel 10 in an embodiment of the present invention, which includes a substrate 11 and a plurality of organic light emitting devices 12 disposed on the substrate 11. The plurality of organic light emitting devices 12 include a plurality of first organic light emitting devices 121 for emitting light having a first color, a plurality of second organic light emitting devices 122 for emitting light having a second color, and a plurality of third organic light emitting devices 123 for emitting light having a third color, at least one of the first organic light emitting devices 121, the second organic light emitting devices 122, and the third organic light emitting devices 123 includes a structural layer doped with quantum dots, the structural layer is located on a light emitting side of the light emitting layer 13, the quantum dots are used for converting the light emitted from the light emitting layer 13 into light having a color corresponding to the one of the organic light emitting devices, and a difference between lifetimes of light emitting materials of the light emitting layers of each two of the organic light emitting devices is not greater than a preset threshold.
Any of the organic light emitting devices 12 may further include a cathode 21, an electron injection layer 22, an electron transport layer 23, a hole transport layer 24, a hole injection layer 25, and an anode 26 in addition to the light emitting layer 13. A pixel defining layer 27 may also be disposed on the substrate base plate 11. The electron transport layer 23, the electron injection layer 22, and the cathode 21 are sequentially provided on one side of the light-emitting layer 13, and the hole transport layer 24, the hole injection layer 25, and the anode 26 are sequentially provided on the other side of the light-emitting layer 13.
When the light emitting layer 13 emits light, light is emitted to both sides of the light emitting layer 13, if the organic light emitting device 12 is a top emission organic light emitting device, the anode 26 is a reflective electrode, and the light emitted from the light emitting layer 13 is emitted from the cathode 21 and is not emitted from the anode 26, in this case, the side where the electron transport layer 23, the electron injection layer 22 and the cathode 21 are located in the electron light emitting device 12 is referred to as a light emitting side; if the organic light emitting device 12 is a bottom emission organic light emitting device and the cathode 21 is a reflective electrode, the light emitted from the light emitting layer 13 is emitted from the anode 26 and not emitted from the cathode 21, in this case, the side of the electron light emitting device 12 where the hole transport layer 24, the hole injection layer 25 and the anode 26 are located is referred to as a light emitting side; in the case where the organic light emitting device 12 is a double-sided light emitting organic light emitting device, the light emitted from the light emitting layer 13 is emitted from both the cathode 21 and the anode 26, and in this case, the side where the electron transport layer 23, the electron injection layer 22, and the cathode 21 are located in the electron light emitting device 12 and the side where the hole transport layer 24, the hole injection layer 25, and the anode 26 are located are collectively referred to as a light emitting side.
When lifetime is defined as: when the luminance of the organic light emitting device decreases to a time required for 95% of the original luminance, the predetermined threshold may be 500, and the unit of the lifetime may be hours. The conditions for testing the lifetime can be referred to as: the test environment temperature is 25 ℃, the humidity is 55%, and the dark room (less than or equal to 1LUX) is adopted; the test point is the central point of the screen, and the current density of each sub-pixel is testedThe degree is 50mA/cm2。
Firstly, doping quantum dots in a structural layer of an organic light emitting device can convert light emitted by a light emitting layer into light of a color corresponding to the organic light emitting device without changing the film thickness of each structural layer, namely, without increasing the film thickness of each structural layer, so that a display panel can emit light of various colors through each organic light emitting device, and it should be noted that the transmission of electrons and/or holes can not be influenced without increasing the film thickness of each structural layer, and further the light emitting efficiency and the light emitting brightness of the light emitting layer can not be influenced; secondly, in the organic light emitting display panel, the difference between the service lives of the light emitting materials in any two organic light emitting devices is small and is not larger than the preset threshold, so that after the organic light emitting display panel is used for a period of time, the attenuation degrees of the light emitting brightness of each light emitting material are not large, the light emitting brightness difference of each light emitting material is small, and the problem of color cast is relieved to a certain extent.
Optionally, the first color, the second color, and the third color are each one of red, green, and blue. Three organic light emitting devices emitting red, green and blue light are disposed in the organic light emitting display panel, which can ensure that the organic light emitting display panel can emit light of various colors through the organic light emitting devices emitting red, green and blue light. The first color, the second color, and the third color may be other colors, which is not limited in the embodiment of the present invention.
Optionally, the first organic light emitting device 121, the second organic light emitting device 122, and the third organic light emitting device 123 are top-emitting organic light emitting devices, and the structure layer doped with quantum dots includes at least one of the cathode 21, the electron injection layer 22, and the electron transport layer 23. For example, as shown in fig. 2, the first organic light emitting device 121, the second organic light emitting device 122, and the third organic light emitting device 123 are top-emitting organic light emitting devices, the first organic light emitting device 121 includes a structural layer doped with quantum dots 28, and the structural layer doped with quantum dots 28 is the electron transport layer 23.
Firstly, quantum dots are doped in at least one of the cathode 21, the electron injection layer 22 and the electron transport layer 23, so that the film thickness of each structural layer is not changed, that is, under the condition that the film thickness of each structural layer is not increased, the light emitted by the light emitting layer is converted into the light of the color corresponding to the organic light emitting device, so that the display panel can emit the light of various colors through each organic light emitting device, it should be noted that the transmission of electrons is not affected without increasing the film thickness of each structural layer, and the light emitting efficiency and the light emitting brightness of the light emitting layer are not affected; secondly, if the material of the quantum dot is graphene, the quantum dot can also improve the transmission speed of electrons, so that the transmission speeds of the electrons and holes are synchronous, and the organic light-emitting device can achieve a better light-emitting state.
Optionally, the first organic light emitting device 121, the second organic light emitting device 122, and the third organic light emitting device 123 are bottom light emitting organic light emitting devices, and the structure layer doped with quantum dots includes at least one of an anode, a hole injection layer, and a hole transport layer. For example, as shown in fig. 3, the first organic light emitting device 121, the second organic light emitting device 122, and the third organic light emitting device 123 are all bottom-emitting organic light emitting devices, the second organic light emitting device 122 includes a structure layer doped with quantum dots 29, and the structure layer doped with quantum dots 29 is the hole transport layer 24.
The quantum dots are doped in at least one of the anode, the hole injection layer and the hole transport layer, so that the film thickness of each structural layer is not changed, that is, the light emitted by the light emitting layer is converted into the light of the color corresponding to the organic light emitting device under the condition that the film thickness of each structural layer is not increased, so that the display panel can emit the light of various colors through each organic light emitting device.
Optionally, the first organic light emitting device 121, the second organic light emitting device 122, and the third organic light emitting device 123 are both double-sided light emitting organic light emitting devices, and the structure layer doped with quantum dots includes at least one of a cathode, an electron injection layer, and an electron transport layer, and includes at least one of an anode, a hole injection layer, and a hole transport layer. For example, as shown in fig. 4, each of the first organic light emitting device 121, the second organic light emitting device 122, and the third organic light emitting device 123 is a double-sided light emitting organic light emitting device, each of the third organic light emitting devices 123 includes a structure layer doped with quantum dots 30, and the structure layers doped with quantum dots 30 are an electron transport layer 23 and a hole transport layer 24.
The quantum dots are doped in at least one of the cathode 21, the electron injection layer 22 and the electron transport layer 23, and the quantum dots are doped in at least one of the anode, the hole injection layer and the hole transport layer, so that light emitted by the light emitting layer can be converted into light of a color corresponding to the organic light emitting device without increasing the thickness of each structural layer of the organic light emitting device, so that the display panel can emit light of various colors through each organic light emitting device, and it should be noted that the transmission of holes is not affected without increasing the thickness of each structural layer, and further, the light emitting efficiency and the light emitting brightness of the light emitting layer are not affected.
Optionally, the first organic light emitting device 121 and the second organic light emitting device 122 include a light emitting layer 13 having a first light emitting material therein, the first light emitting material is used for emitting light having a first color, the second organic light emitting device 122 includes at least one structural layer doped with a first quantum, the first quantum dot is used for converting the light having the first color into light having a second color, and the third organic light emitting device 123 includes a light emitting layer having a second light emitting material therein, the second light emitting material is used for emitting light having a third color. Wherein the at least one structural layer is located on the light-emitting side of the light-emitting layer 13.
Specifically, the first color is red, the second color is green, the third color is blue, the first luminescent material is a red phosphorescent luminescent material, and the second luminescent material is a blue fluorescent luminescent material; or the first color is blue, the second color is green, the third color is red, the first luminescent material is a blue fluorescent luminescent material, and the second luminescent material is a red phosphorescent luminescent material.
In addition, the service lives of the first luminescent material and the second luminescent material are longer than that of the luminescent material for emitting green light, and compared with the prior art, the service life of the organic luminescent display panel is prolonged.
Optionally, the first organic light emitting device 121, the second organic light emitting device 122 and the third organic light emitting device 123 include light emitting layers 13 each having a third light emitting material, and the third light emitting material is configured to emit light having the first color; the second organic light emitting device 122 includes at least one structural layer doped with second quantum dots for converting light having a first color into light having a second color, and the third organic light emitting device 123 includes at least one structural layer doped with third quantum dots for converting light having the first color into light having a third color. Wherein the at least one structural layer is located on the light-emitting side of the light-emitting layer 13.
Specifically, the third luminescent material is a red phosphorescent luminescent material, the first color is red, and the second color and the third color are each one of green and blue; or the third luminescent material is a green phosphorescent luminescent material, the first color is green, and the second color and the third color are each one of red and blue; alternatively, the third luminescent material is a blue fluorescent luminescent material, the first color is blue, and the second color and the third color are each one of red and green.
In addition, when the luminescent material used by all the organic luminescent devices is a red phosphorescent luminescent material or a blue fluorescent luminescent material, the service life of the red phosphorescent luminescent material or the blue fluorescent luminescent material is longer than that of the green phosphorescent luminescent material, and compared with the prior art, the service life of the display panel is prolonged. In particular, when the third light emitting material is a red phosphorescent material, it has advantages of both high efficiency and long lifetime, so that the lifetime and efficiency of the display panel are simultaneously improved.
Optionally, the light emitting layers 13 included in the first organic light emitting device 121, the second organic light emitting device 122 and the third organic light emitting device 123 all have a fourth light emitting material, and the fourth light emitting material is configured to emit light with a fourth color; the first organic light emitting device 121 includes at least one structural layer doped with fourth quantum dots for converting light having a fourth color into light having a first color, the second organic light emitting device 122 includes at least one structural layer doped with fifth quantum dots for converting light having a fourth color into light having a second color, and the third organic light emitting device 123 includes at least one structural layer doped with sixth quantum dots for converting light having a fourth color into light having a third color. Wherein the at least one structural layer is located on the light-emitting side of the light-emitting layer 13. The fourth color may be any other color other than red, green, and blue. The fourth light-emitting material is not limited to this, and may be any fluorescent light-emitting material having high efficiency and long lifetime. Because the luminescent materials used by all the organic luminescent devices are the same, the attenuation of the luminescent devices of all colors along with time is the same, and therefore, the problem that the display panel in the prior art has color cast after being used for a period of time is solved.
Optionally, the material of the quantum dot is a graphene quantum dot material.
On the first hand, when the material of the quantum dots is graphene quantum dot material, the quantum dots doped in at least one structural layer of the cathode, the electron transport layer and the electron injection layer can promote the transport speed of electrons, so that the transport speeds of electrons and holes are synchronous, and the organic light-emitting device can achieve a better light-emitting state. In the embodiment of the present invention, since the doped quantum dots in at least one of the cathode, the electron transport layer, and the electron injection layer can increase the transport speed of the electrons, the thickness of the hole buffer layer in the organic light emitting device can be reduced, or the hole buffer layer can be directly removed, so that the overall thickness of the organic light emitting device can be reduced, and the space in the organic light emitting panel can be further saved. In a third aspect, the graphene quantum dots can absorb high-energy light and emit low-energy light, and in addition, the graphene quantum dots also have up-conversion luminescence property, that is, absorb low-energy light and emit high-energy light, for example, energy of blue light > energy of red light > energy of green light, and under irradiation of blue light, the graphene quantum dots can emit red or green light, or, under irradiation of red light, the graphene quantum dots can emit blue or green light.
Optionally, the energy of light emitted by a light emitting layer included in the organic light emitting device doped with quantum dots is greater than the energy of light of a color corresponding to the organic light emitting device, and the quantum dots doped in the organic light emitting device are made of materials such as CdS, CdSe, CdTe, ZnO, ZnSe, ZnTe, GaAs, GaP, GaAs, GaSb, HgS, HgSe, HgTe, InAs, InP, InSb, AlAs, AlP, or AlSb.
The quantum dots of the material can absorb high-energy light and emit low-energy light, for example, the energy of blue light > the energy of red light > the energy of green light, and the quantum dots can emit red or green light under the irradiation of blue light or red light under the irradiation of green light.
Optionally, a quantum dot film is further disposed in the organic light emitting device doped with quantum dots, the quantum dot film is located on the light emitting side of the light emitting layer, and the quantum dots in the quantum dot film and the doped quantum dots are quantum dots made of the same material and having the same size. For example, referring to fig. 5, all the organic light emitting devices are top emission devices, quantum dots 28 are disposed in the electron transport layer 23 of the first organic light emitting device 121, and a quantum dot film 31 is disposed between the electron transport layer 23 and the electron injection layer 22 of the organic light emitting device 121.
The quantum dot film is arranged in the organic light-emitting device doped with quantum dots, so that light rays emitted by a light-emitting layer of the organic light-emitting device can be more fully converted into light rays with colors corresponding to the organic light-emitting device. In addition, if the quantum dot film is disposed on a side of the cathode away from the light-emitting layer or on a side of the anode away from the light-emitting layer, light emitted from the light-emitting layer of the organic light-emitting device can be more sufficiently converted into light having a color corresponding to the organic light-emitting device without increasing thicknesses of the structural layers of the organic light-emitting device.
In addition, an embodiment of the present invention provides an organic light emitting display device, as shown in fig. 6, fig. 6 is a top view of the display device provided in the embodiment of the present invention, and the display device includes the display panel 10 described above. The display device provided by the embodiment of the invention can be any product or component with a display function, such as a smart phone, a wearable smart watch, smart glasses, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, a vehicle-mounted display, an electronic book and the like.
The technical scheme of the embodiment of the invention has the following beneficial effects:
in the organic light-emitting display panel, the difference between the service lives of the light-emitting materials in any two organic light-emitting devices is smaller and is not larger than the preset threshold, so that after the organic light-emitting display panel is used for a period of time, the attenuation degrees of the light-emitting brightness of the light-emitting materials are not greatly different, the light-emitting brightness difference of the light-emitting materials is smaller, and the problem of color cast is relieved to a certain extent.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (14)
1. An organic light emitting display panel includes a substrate base plate, and a plurality of organic light emitting devices disposed on the substrate base plate; the plurality of organic light emitting devices includes a plurality of first organic light emitting devices for emitting light having a first color, a plurality of second organic light emitting devices for emitting light having a second color, and a plurality of third organic light emitting devices for emitting light having a third color;
at least one of the first organic light emitting device, the second organic light emitting device and the third organic light emitting device comprises a structural layer doped with quantum dots, the structural layer is positioned on the light emitting side of the light emitting layer, and the quantum dots are used for converting light emitted by the light emitting layer into light with a color corresponding to the organic light emitting device;
the light emitting layers of each two organic light emitting devices in the organic light emitting devices have a difference in lifetime of the light emitting materials not greater than a preset threshold.
2. The display panel of claim 1, wherein: the first color, the second color, and the third color are each one of red, green, and blue.
3. The display panel of claim 1, wherein:
the first organic light-emitting device and the second organic light-emitting device comprise light-emitting layers which are provided with first light-emitting materials, and the first light-emitting materials are used for emitting light with a first color;
the second organic light-emitting device comprises at least one structural layer doped with first quantum dots, wherein the first quantum dots are used for converting light with a first color into light with a second color;
the third organic light emitting device includes a light emitting layer having a second light emitting material therein for emitting light having a third color.
4. The display panel according to claim 3, wherein:
the first color is red, the second color is green, the third color is blue, the first luminescent material is a red phosphorescent luminescent material, and the second luminescent material is a blue fluorescent luminescent material;
or,
the first color is blue, the second color is green, the third color is red, the first luminescent material is a blue fluorescent luminescent material, and the second luminescent material is a red phosphorescent luminescent material.
5. The display panel of claim 1, wherein the first, second, and third organic light emitting devices each include a light emitting layer having a third light emitting material for emitting light having a first color;
the second organic light emitting device includes at least one structural layer doped with second quantum dots for converting light having a first color into light having a second color, and the third organic light emitting device includes at least one structural layer doped with third quantum dots for converting light having the first color into light having a third color.
6. The display panel according to claim 5, wherein:
the third luminescent material is a red phosphorescent luminescent material, the first color is red, and the second color and the third color are each one of green and blue;
or,
the third luminescent material is a green phosphorescent luminescent material, the first color is green, and the second color and the third color are each one of red and blue;
or,
the third luminescent material is a blue fluorescent luminescent material, the first color is blue, and the second color and the third color are each one of red and green.
7. The display panel of claim 1, wherein the first, second, and third organic light emitting devices each include a light emitting layer having a fourth light emitting material for emitting light having a fourth color;
the first organic light emitting device comprises at least one structural layer doped with fourth quantum dots, the fourth quantum dots are used for converting light with a fourth color into light with a first color, the second organic light emitting device comprises at least one structural layer doped with fifth quantum dots, the fifth quantum dots are used for converting light with the fourth color into light with a second color, and the third organic light emitting device comprises at least one structural layer doped with sixth quantum dots, the sixth quantum dots are used for converting light with the fourth color into light with a third color.
8. The display panel of claim 1, wherein the first, second, and third organic light emitting devices are top emitting organic light emitting devices, and the quantum dot doped structural layer comprises at least one of a cathode, an electron injection layer, and an electron transport layer.
9. The display panel of claim 1, wherein the first, second, and third organic light emitting devices are bottom emitting organic light emitting devices, and the quantum dot doped structural layer comprises at least one of an anode, a hole injection layer, and a hole transport layer.
10. The display panel of claim 1, wherein the first, second, and third organic light emitting devices are all double-sided light emitting organic light emitting devices, and the quantum dot doped structural layer comprises at least one of a cathode, an electron injection layer, and an electron transport layer, and comprises at least one of an anode, a hole injection layer, and a hole transport layer.
11. The display panel according to claim 1, wherein a quantum dot film is further provided in the quantum dot doped organic light emitting device, the quantum dot film is located on the light emitting side of the light emitting layer, and the quantum dots in the quantum dot film and the doped quantum dots are quantum dots of the same material and the same size.
12. The display panel of claim 1, wherein the material of the quantum dots is a graphene quantum dot material.
13. The display panel of claim 1, wherein the organic light emitting device doped with quantum dots comprises a light emitting layer emitting light having an energy greater than that of light of a corresponding color of the organic light emitting device, and the material of the quantum dots doped in the organic light emitting device is CdS, CdSe, CdTe, ZnO, ZnSe, ZnTe, GaAs, GaP, GaAs, GaSb, HgS, HgSe, HgTe, InAs, InP, InSb, AlAs, AlP, or AlSb.
14. An organic light emitting display device comprising the organic light emitting display panel according to any one of claims 1 to 13.
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