CN111129322A - Color-adjustable coplanar electrode type organic electroluminescent device - Google Patents

Color-adjustable coplanar electrode type organic electroluminescent device Download PDF

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CN111129322A
CN111129322A CN201911137146.XA CN201911137146A CN111129322A CN 111129322 A CN111129322 A CN 111129322A CN 201911137146 A CN201911137146 A CN 201911137146A CN 111129322 A CN111129322 A CN 111129322A
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layer
electrode layer
electrode
light emitting
color
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孟鸿
赵长斌
纪君朋
白钧午
刘铭
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Peking University Shenzhen Graduate School
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Peking University Shenzhen Graduate School
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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
    • 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
    • H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
    • 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
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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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass

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Abstract

The invention discloses a color-adjustable coplanar electrode type organic electroluminescent device which comprises a substrate, an adjusting electrode layer, a hole functional layer, a light-emitting layer, an electron functional layer and an electrode layer, wherein the electrode layer comprises an electrode layer A and an electrode layer B which are arranged at intervals, the light-emitting layer comprises a light-emitting layer A and a light-emitting layer B which are transversely arranged side by side, and the light-emitting layer A and the light-emitting layer B adopt light-emitting materials with different colors. The invention is based on the device structure of the coplanar electrode, and prepares the coplanar electrode type organic electroluminescent device with adjustable color by the way of transversely arranging the luminous subunits in parallel, and can change the color proportion and the intensity of two different lights by changing and adjusting the alternating current phase, the amplitude and the frequency of the electrode, thereby realizing color adjustment and control.

Description

Color-adjustable coplanar electrode type organic electroluminescent device
Technical Field
The invention relates to the field of electroluminescence, in particular to the field of an alternating current driven electroluminescence device with adjustable and controllable color.
Background
Organic Light-emitting Diodes (OLEDs) are a phenomenon in which holes and electrons are injected through two electrodes, respectively, and the holes and the electrons drift to a Light-emitting layer under the action of an electric field to form excitons, are captured by a Light-emitting material, and then jump to emit Light. The LED lamp has the advantages of high luminous efficiency, low power consumption, simple preparation process, capability of realizing flexibility and stretching and the like, is widely applied to the fields of electronic product displays, lighting products, traffic indication and the like, and is the most potential next-generation ideal display and energy-saving environment-friendly lighting product. The driving method can be divided into direct current and alternating current electroluminescent devices.
In recent years, intelligent technology has been widely used in various optoelectronic devices and systems. The current intelligent display technology mainly has two defects:
(1) the ability to independently control the light source spectrum and intensity is crucial for intelligent lighting technologies. At present, the conventional structure controls the spectrum and intensity of OLEDs, and is generally achieved by two methods. The first approach is to take advantage of the voltage dependent color shift characteristics of OLEDs, but it is difficult to independently adjust the spectrum and brightness. Another approach is to use multiple emission units, such as vertically overlapping two or more emission units or arranging multiple monochromatic OLEDs side-by-side. However, these suffer from one or more disadvantages, such as complex, costly, and inefficient manufacturing processes.
(2) In the conventional stacked-structure OLEDs device, an effective area exists in the overlap between the anode and cathode electrodes. The opposite electrodes of the power input are located in different layers of the device and therefore cannot be made simultaneously.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, the present invention provides a color tunable coplanar electrode type organic electroluminescent device.
The invention adopts the following technical scheme:
a color-adjustable coplanar electrode type organic electroluminescent device comprises a substrate, an adjusting electrode layer, a hole functional layer, a luminescent layer, an electronic functional layer and an electrode layer which are sequentially arranged from bottom to top, wherein the luminescent layer comprises a luminescent layer A and a luminescent layer B which are transversely arranged side by side, the luminescent layer A and the luminescent layer B adopt luminescent materials with different colors, the electrode layer comprises an electrode layer A and an electrode layer B, and the electrode layer A and the electrode layer B are arranged on the surface of the electronic functional layer at intervals;
or, including base, electrode layer, hole functional layer, luminescent layer, electron functional layer and the regulation electrode layer that sets gradually from bottom to top, the luminescent layer is including horizontal luminescent layer A and the luminescent layer B that sets up side by side, luminescent layer A and luminescent layer B adopt different colours luminescent material, the electrode layer includes electrode layer A and electrode layer B, electrode layer A and electrode layer B interval arrangement set up in the surface of base.
A color-adjustable coplanar electrode type organic electroluminescent device comprises a substrate, an adjusting electrode layer, an electronic functional layer, a light emitting layer, a hole functional layer and an electrode layer which are sequentially arranged from bottom to top, wherein the light emitting layer comprises a light emitting layer A and a light emitting layer B which are transversely arranged side by side, the light emitting layer A and the light emitting layer B adopt different color light emitting materials, the electrode layer comprises an electrode layer A and an electrode layer B, and the electrode layer A and the electrode layer B are arranged on the surface of the hole functional layer at intervals;
or, including base, electrode layer, electron functional layer, luminescent layer, hole functional layer and the regulation electrode layer that sets gradually from bottom to top, the luminescent layer is including horizontal luminescent layer A and the luminescent layer B that sets up side by side, luminescent layer A and luminescent layer B adopt different colours luminescent material, the electrode layer includes electrode layer A and electrode layer B, electrode layer A and electrode layer B interval arrangement set up in the surface of base.
Has the advantages that: compared with the prior art, the invention has the following advantages: the invention is based on the device structure of the coplanar electrode, and prepares the color-adjustable coplanar electrode type electroluminescent device by a way that two luminescent units with different colors are transversely arranged. The device can realize that two-phase alternating current drives to emit two colors of light, and not only controls the luminous intensity of two luminous units, but also can control the proportion of two different colors of light by changing the phase, frequency and voltage of third-phase alternating current applied to the regulating electrode, thereby realizing color regulation and control. The coplanar electrode type organic electroluminescent device with simple process and adjustable color intensity meets the market requirement and the cost requirement of large-scale production. The LED lamp can be applied to an intelligent lighting system, meets different requirements of various places on lighting, and can regulate and control luminous intensity and color to realize intelligent lighting.
Drawings
Fig. 1 is a schematic structural diagram of a device in which a tuning electrode is disposed on a bottom dielectric layer and has a bottom-up structure according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a device with a top dielectric layer and a bottom dielectric layer with a regulating electrode in a bottom-up structure according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a device with a bottom dielectric layer and a bottom inverted structure of a tuning electrode according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a device with a bottom-inverted structure of a top dielectric layer and a tuning electrode according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a device in which a tuning electrode is disposed on a bottom dielectric layer and has a top-side structure according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a device in which a modulation electrode is disposed on a top dielectric layer and has a top-facing structure according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a device with a top-inverted structure of a bottom dielectric layer and a tuning electrode according to an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a device with a top-dielectric-layer-on-top inverted structure and a tuning electrode according to an embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a device in an embodiment of the invention.
Fig. 10 is a voltage-luminance-frequency characteristic curve of a blue-yellow two-color tunable coplanar electrode type organic electroluminescent device in an example embodiment of the present invention.
Fig. 11 is a graph showing an ac phase difference and a blue-yellow luminance curve of the adjustment electrode of the blue-yellow two-color adjustable coplanar electrode type organic electroluminescent device in an embodiment of the present invention.
Fig. 12 is a schematic diagram of the shift of the color of emitted light in the CIE coordinate diagram according to the phase of the third-phase ac voltage applied by the adjustment electrode in the blue-yellow two-color tunable coplanar interdigital electrode type organic electroluminescent device according to the embodiment of the present invention.
Detailed Description
The present invention provides a color-adjustable coplanar electrode type organic electroluminescent device, and the present invention is further described in detail below in order to make the purpose, technical scheme and effect of the present invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a color-adjustable coplanar electrode type organic electroluminescent device which comprises a substrate, an adjusting electrode layer, a hole function layer, a light-emitting layer, an electron function layer and an electrode layer, wherein the electrode layer comprises an electrode layer A and an electrode layer B which are arranged at intervals, the light-emitting layer comprises a light-emitting layer A and a light-emitting layer B which are transversely arranged side by side, and the light-emitting layer A and the light-emitting layer B adopt light-emitting materials with different colors. The dielectric layer may or may not be added. The uppermost layer can be additionally provided with a packaging layer for isolating the influence of the external environment, or the uppermost layer can be not additionally provided with the packaging layer.
Note that the hole function layer includes one or more of a hole injection layer, a hole transport layer, and the like, and the electron function layer includes one or more of an electron injection layer, an electron transport layer, and the like. The adjusting electrode layer can be a bottom or top structure, and the dielectric layer can be a bottom or top structure; the layered structure between the adjusting electrode layer and the electrode layer can be a positive structure or an inverted structure. The color tunable coplanar electrode type organic electroluminescent device according to the embodiment of the present invention will be described below by taking the structures shown in fig. 1 to 8 as examples.
The embodiment of the invention provides a color-adjustable coplanar electrode type organic electroluminescent device, which comprises a substrate 1, an adjusting electrode layer 2, a dielectric layer 3, a hole injection layer 4, a hole transport layer 5, a light emitting layer, an electron transport layer 7, an electron injection layer 8 and an electrode layer 9 which are sequentially arranged from bottom to top as shown in figure 1, wherein the light emitting layer comprises a light emitting layer A (6-1) and a light emitting layer B (6-2) which are transversely arranged side by side, the light emitting layer A and the light emitting layer B adopt light emitting materials with different colors, the electrode layer 9 comprises an electrode layer A and an electrode layer B, and the electrode layer A and the electrode layer B are arranged on the surface of the electron injection layer 8 at intervals. The dielectric layer 3 may be disposed on the surface of the electron injection layer 8, such that the electrode layers a and B are disposed on the surface of the dielectric layer 3 at intervals, as shown in fig. 5. Wherein, the positions of the adjustment electrode layer 2 and the electrode layer 9 can be interchanged, so that the dielectric layer 3 is disposed on the surface of the electrode layer 9 and the uncovered surface of the electrode layer 9 on the substrate 1, as shown in fig. 2. Wherein, when the dielectric layer 3 is disposed on the surface of the electron injection layer 8 and the positions of the adjustment electrode layer 2 and the electrode layer 9 are interchanged, the device structure is as shown in fig. 6.
The embodiment of the invention provides a color-adjustable coplanar electrode type organic electroluminescent device, which comprises a substrate 1, an adjusting electrode layer 2, a dielectric layer 3, an electron injection layer 8, an electron transport layer 7, a light emitting layer, a hole transport layer 5, a hole injection layer 4 and an electrode layer 9 which are sequentially arranged from bottom to top, wherein the light emitting layer comprises a light emitting layer A (6-1) and a light emitting layer B (6-1) which are transversely arranged side by side, the light emitting layer A and the light emitting layer B adopt light emitting materials with different colors, the electrode layer 9 comprises an electrode layer A and an electrode layer B, and the electrode layer A and the electrode layer B are arranged on the surface of the hole injection layer 4 at intervals. The dielectric layer 3 may be disposed on the surface of the hole injection layer 4, such that the electrode layers a and B are disposed on the surface of the dielectric layer 3 at intervals, as shown in fig. 7. Wherein, the positions of the adjustment electrode layer 2 and the electrode layer 9 can be interchanged, so that the dielectric layer 3 is disposed on the surface of the electrode layer 9 and the uncovered surface of the electrode layer 9 on the substrate 1, as shown in fig. 4. When the dielectric layer 3 is disposed on the surface of the hole injection layer 4 and the positions of the adjustment electrode layer 2 and the electrode layer 9 are interchanged, the device structure is as shown in fig. 8.
The working principle of the device of the embodiment is as follows: first, alternating currents of the same voltage and frequency are applied to the electrode layer A, B in opposite phases (180 ° out of phase), the two-color device emits light under voltage driving, and the luminance becomes brighter as the voltage and frequency increase. Then, when a third phase voltage having the same voltage frequency is applied to the adjustment electrodes, the voltage phase difference on the adjustment electrodes is changed, and when the phase difference is 0 ° from the voltage applied to one of the light emitting units (180 ° from the other light emitting unit), the light emitting unit is extinguished because the voltage phase is offset and the actual voltage is 0V. The other light emitting unit continues to be lit. Stepless adjustment between yellow bright (0 deg.), yellow blue simultaneously bright (90 deg.) to blue bright (180 deg.) can be achieved when the adjustment electrode phase difference is gradually changed between 0 deg. -180 deg.. By utilizing the principle, the interdigital electrode device is prepared, and if the distance between the interdigital electrodes is smaller than the resolution of human eyes, the adjustment from yellow light, white light (blue-yellow mixed light) to blue light can be realized.
The embodiment has the following advantages: in this embodiment, a color-controllable coplanar electrode type electroluminescent device is prepared by arranging two different color light-emitting units in parallel in a horizontal manner based on a coplanar electrode device structure. The device can realize that two-phase alternating current drives to emit two colors of light, and not only controls the luminous intensity of two luminous units, but also can control the proportion of two different colors of light by changing the phase, frequency and voltage of third-phase alternating current applied to the regulating electrode, thereby realizing color regulation and control. The coplanar electrode type organic electroluminescent device with simple process and adjustable color intensity meets the market requirement and the cost requirement of large-scale production. The LED lamp can be applied to an intelligent lighting system, meets different requirements of various places on lighting, and can regulate and control luminous intensity and color to realize intelligent lighting.
In one embodiment, the material of the adjustment electrode layer may be any material capable of conducting electricity, including metal oxides such as Indium Tin Oxide (ITO); metals such as silver, magnesium-silver alloy, aluminum, gold, samarium and the like; or a nano conductive material such as a carbon nano tube, a silver nano wire and the like, or a conductive polymer such as poly 3, 4-ethylenedioxythiophene/polystyrene sulfonate (PEDOT: PSS) and the like.
In the embodiment, the electrode layer a and the electrode layer B are formed on the substrate or other functional layers at intervals side by side, and the electrode layer a and the electrode layer B are on the same plane, so that the light-emitting area is increased, and the difficulty of the preparation process is reduced. In one embodiment, the material of the electrode layer a and the electrode layer B is independently one or more of silver, iron, magnesium-silver alloy, aluminum, nickel, palladium, gold, copper, platinum, magnesium-aluminum alloy, copper-silver alloy, aluminum-copper alloy, iron-copper-silver alloy, or metal alloy, or modified or unmodified graphene, graphite, carbon black (including superconducting carbon black), carbon fiber, single-walled carbon nanotube, multi-walled carbon nanotube, or doped or undoped PEDOT, PANi, Ppy, or other conductive polymer material, or conductive elastomer, or conductive oxide, such as Indium Tin Oxide (ITO), fluorine-doped indium oxide (FTO), indium zinc oxide (ZTO), and Antimony Tin Oxide (ATO). The materials used for the electrodes a or B may be the same or different.
In one embodiment, the substrate is made of an insulator material, and includes one or more of glass, paper, photoresist, high molecular polymer, cloth, plastic, and the like. The substrate may be rigid or flexible, and is not limited in shape or size.
In this embodiment, the dielectric layer may form a capacitor, so that the alternating current stably and efficiently drives the light emitting layer to emit light. In one embodiment, the material of the dielectric layer is an organic or inorganic dielectric material or a composite thereof. Preferably, the dielectric layer is made of organic high-dielectric constant material including polyvinylidene fluoride, polytetrafluoroethylene, polyvinylidene fluoride-trifluoroethylene copolymer (P (VDF-TrFE), P (VDF-TrFE-CTFE), P (VDF-TrFE-CFE)), polystyrene, polyvinyl alcohol, polyvinylpyrrolidone, polymethyl methacrylate, and tetrafluoroethylene hexa-vinylFluoropropyl copolymer, poly-4-methyl-1-pentene, polypropylene, polyethylene, polychlorotrifluoroethylene, polyphenylene ether, polycarbonate, ethyl cellulose, CYTOP, polyethylene terephthalate, parylene and inorganic high dielectric constant materials including barium titanate, hafnium oxide, zinc oxide, nickel oxide, aluminum oxide, titanium dioxide, tin oxide, cerium oxide, zirconium oxide, vanadium tetraoxide, vanadium pentoxide, perovskite type metal oxide (ABO)3) One or more of tantalum pentoxide, silicon dioxide, silicon oxynitride, silicon nitride, Sialon and yttria alumina. Wherein, Sialon is a compound word of four elements of Si, Al, O and N, and is Si3N4The dielectric layer of the present embodiment can also be prepared by using a general name of a solid solution in which Si and N atoms are replaced by Al and O atoms. More preferably, the dielectric layer is prepared from one or more of polyvinylidene fluoride-trifluoroethylene copolymer, polystyrene, polyvinyl alcohol, polyvinylpyrrolidone and polymethyl methacrylate.
In one embodiment, the material of the hole injection layer is molybdenum trioxide (MoO)3) Tungsten trioxide (WoO)3) Or 2,3,6,7,10, 11-hexacyano-1, 4,5,8,9, 12-hexaazatriphenylene (HAT-CN), etc. are not limited thereto.
In one embodiment, the material of the hole transport layer is 4,4' -cyclohexylbis (N, N-bis (4-methylphenyl) aniline) (TAPC), 4',4' -tris (carbazol-9-yl) triphenylamine (TCTA), N ' -diphenyl-N, N ' - (1-naphthyl) -1,1' -biphenyl-4, 4' -diamine (NPB), or the like, but is not limited thereto.
In one embodiment, the light-emitting layers a and B use different color light-emitting materials, and the light-emitting materials of the light-emitting layers a and B are independently selected from one of red, green, blue, yellow and other light-emitting materials. The luminescent material adopts a doping structure of a host material and a guest material, wherein the host material is selected from 4,4',4' -tri (carbazole-9-yl) triphenylamine (TCTA), 4' -N, N-dicarbazole-biphenyl (CBP), 9' - (2, 6-pyridyldi-3, 1-phenylene) bis-9H-carbazole (26DCzPPy), 2' - (1, 3-phenyl) bis [5- (4-tert-butylphenyl) -1,3, 4-oxadiazole](OXD-7) and the likeOne kind of the material is selected; the guest material for blue light is selected from bis (4, 6-difluorophenylpyridine-N, C2) picolinoyl iridium (Firpic), bis (3, 5-difluoro-2- (2-pyridyl-KN) phenyl-KC) (tetrakis (1H-pyrazolyl-KN 1) boronic acid (1-) -KN2, KN2') -iridium (Fin 6) or bis (2-hydroxyphenylpyridine) beryllium (Be (PP))2) And the like; the green guest material is selected from tris (2-phenylpyridine) iridium [ Ir (ppy)3]Bis (2-phenylpyridine-C2, N) acetylacetonate iridium (III) [ Ir (ppy)2(acac)]And the like; the yellow light guest material is selected from acetyl pyruvic acid di (4-phenyl-thiophene [3,2-c ]]pyridine-C2, N) Iridium (III) (PO-01), bis (4- (4-tert-butyl-phenyl) -thiophene [3, 2-C) acetylacetonate]At least one of pyridine-C2, N) iridium (III) (PO-01-TB), etc.; the red guest material is selected from tris (1-phenylisoquinoline) iridium [ Ir (piq) ]3]Or (acetylacetonato) bis (2-methyldibenzo [ f, h ]]Quinoxaline) Iridium [ Ir (MDQ)2(acac)]And the like. Wherein the mass ratio of the host material to the guest material is 50:1-1: 1.
In one embodiment, the material of the electron transport layer is 1,3, 5-tris (2-N-benzene-benzimidazole) benzene (TPBi), 1,3, 5-tris [ (3-pyridyl) -3-phenyl ] benzene (TmPyPB), 1, 3-bis (3, 5-bipyridin-3-ylphenyl) benzene (bmpyb), 4, 7-diphenyl-1, 10-phenanthroline (Bphen), or the like, but is not limited thereto.
In one embodiment, the material of the electron injection layer is LiF, Cs2CO3Or (8-hydroxyquinoline) lithium (Liq), and the like are not limited thereto.
In one embodiment, the dielectric layer has a thickness of 100nm to 10um, the hole injection layer has a thickness of 0.1 to 10nm, the hole transport layer has a thickness of 20 to 70nm, the light emitting layer has a thickness of 10 to 50nm, the electron transport layer has a thickness of 20 to 70nm, the electron injection layer has a thickness of 0.1 to 10nm, the adjustment electrode layer has a thickness of 10 to 160nm, and the electrode layer has a thickness of 10 to 160 nm.
In this embodiment, the power system applied to the electrode layer is a two-phase sinusoidal ac power system, wherein the frequency is 0.1Hz to 1 MHz. And the power supply system applied on the adjusting electrode layer is a third-phase sine alternating-current power supply system, wherein the frequency is 0.1Hz-1 MHz.
The color-adjustable planar electrode type organic electroluminescent device can be prepared by at least one of the conventional preparation processes in the field, such as a vacuum evaporation process, a spin coating process or a spraying process, and the like, and the preparation process is simple and the preparation cost is low.
The present invention will be described in detail with reference to specific examples.
In this embodiment, the light-emitting layer a is made of a blue light-emitting material, the light-emitting layer B is made of a yellow light-emitting material, and a vacuum evaporation method is used to prepare a blue-yellow adjustable coplanar electrode type organic electroluminescent device, in which two light-emitting units are arranged in an interdigital electrode shape. The device structure of the blue light-emitting unit is glass/ITO (120nm)/HATCN (5nm)/TAPC (40nm)/26DCzPPy from bottom to top: FIrPic (5: 1, 30nm)/Bphen (40nm)/Liq (2nm)/Ag (100nm), the device structure of the yellow light-emitting unit is glass/ITO (120nm)/HATCN (5nm)/TAPC (40nm)/CBP from bottom to top: PO-01 (10: 1, 30nm)/Bphen (40nm)/Liq (2nm)/Ag (100nm), and the structure of the device is shown in FIG. 9.
When two-phase alternating current with opposite phases is applied to the prepared device, the light-emitting units respectively emit blue light and yellow light, and due to the small inter-digital electrode distance, the two colors are macroscopically seen to be mixed to display white. An alternating current of a third phase is applied to the adjustment electrode layer for color adjustment. When the phase, amplitude and frequency of the applied third phase alternating current are identical to those of the two-phase driving power supply, the light emitting unit is turned off, and the light emitting intensity of the other light emitting unit is increased. As shown in fig. 10 to 11, the blue and yellow light emitting units exhibit different intensities of emission as the phase of the third phase alternating current is gradually changed, thereby achieving color adjustment from blue-white-yellow, and fig. 12 is a CIE coordinate diagram of color adjustment. And the brightness of the display can also be controlled by adjusting the amplitude and frequency of the third phase alternating current.

Claims (10)

1. A color-adjustable coplanar electrode type organic electroluminescent device is characterized by comprising a substrate, an adjusting electrode layer, a hole functional layer, a light emitting layer, an electronic functional layer and an electrode layer which are sequentially arranged from bottom to top, wherein the light emitting layer comprises a light emitting layer A and a light emitting layer B which are transversely arranged side by side, the light emitting layer A and the light emitting layer B adopt different color light emitting materials, the electrode layer comprises an electrode layer A and an electrode layer B, and the electrode layer A and the electrode layer B are arranged on the surface of the electronic functional layer at intervals;
or, including base, electrode layer, hole functional layer, luminescent layer, electron functional layer and the regulation electrode layer that sets gradually from bottom to top, the luminescent layer is including horizontal luminescent layer A and the luminescent layer B that sets up side by side, luminescent layer A and luminescent layer B adopt different colours luminescent material, the electrode layer includes electrode layer A and electrode layer B, electrode layer A and electrode layer B interval arrangement set up in the surface of base.
2. A color-adjustable coplanar electrode type organic electroluminescent device is characterized by comprising a substrate, an adjusting electrode layer, an electronic functional layer, a light emitting layer, a hole functional layer and an electrode layer which are sequentially arranged from bottom to top, wherein the light emitting layer comprises a light emitting layer A and a light emitting layer B which are transversely arranged side by side, the light emitting layer A and the light emitting layer B adopt different color light emitting materials, the electrode layer comprises an electrode layer A and an electrode layer B, and the electrode layer A and the electrode layer B are arranged on the surface of the hole functional layer at intervals;
or, including base, electrode layer, electron functional layer, luminescent layer, hole functional layer and the regulation electrode layer that sets gradually from bottom to top, the luminescent layer is including horizontal luminescent layer A and the luminescent layer B that sets up side by side, luminescent layer A and luminescent layer B adopt different colours luminescent material, the electrode layer includes electrode layer A and electrode layer B, electrode layer A and electrode layer B interval arrangement set up in the surface of base.
3. The color tunable coplanar electrode type organic electroluminescent device according to claim 1 or 2, further comprising a dielectric layer disposed between the tuning electrode layer and the light emitting layer or between the electrode layer and the light emitting layer.
4. The color tunable coplanar electrode type organic electroluminescent device as claimed in claim 1 or 2, wherein the material of the tuning electrode layer is selected from one or more of metal oxides, metals, nano-conductive materials and conductive polymers.
5. The color tunable coplanar electrode type organic electroluminescent device as claimed in claim 1 or 2, wherein the materials of the electrode layer a and the electrode layer B are independently selected from silver, aluminum, gold, copper, platinum, nickel, palladium, iron, magnesium aluminum alloy, copper silver alloy, aluminum copper alloy, iron copper silver alloy, or modified or unmodified graphene, graphite, carbon black, carbon fiber, single-walled carbon nanotube, multi-walled carbon nanotube, or one or more of doped or undoped PEDOT, PANi, Ppy conductive polymer material, conductive elastomer, conductive oxide.
6. The color-tunable coplanar electrode type organic electroluminescent device according to claim 1 or 2, wherein the light-emitting material is composed of a host material and a guest material, and the mass ratio between the host material and the guest material is 50:1 to 1: 1.
7. The color tunable, coplanar electrode type organic electroluminescent device as defined in claim 6 wherein the blue guest material is selected from at least one of bis (4, 6-difluorophenylpyridine-N, C2) picolinoyl iridium, bis (3, 5-difluoro-2- (2-pyridyl-KN) phenyl-KC) (tetrakis (1H-pyrazolyl-KN 1) boronic acid (1-) -KN2, KN2') -iridium (Fir6), bis (2-hydroxyphenylpyridine) beryllium; the green guest material is at least one of iridium tris (2-phenylpyridine) and iridium (III) acetylacetonate (2-phenylpyridine-C2, N); the yellow light guest material is selected from at least one of bis (4-phenyl-thiophene [3,2-C ] pyridine-C2, N) iridium (III) acetylacetonate, bis (4- (4-tert-butyl-phenyl) -thiophene [3,2-C ] pyridine-C2, N) iridium (III) acetylacetonate; the red light guest material is at least one of tris (1-phenylisoquinoline) iridium or (acetylacetone) bis (2-methyl dibenzo [ f, h ] quinoxaline) iridium.
8. The color tunable coplanar electrode type organic electroluminescent device as claimed in claim 1 or 2, wherein the substrate is made of at least one of glass, paper, photoresist, polymer, cloth and plastic.
9. The color tunable coplanar electrode type organic electroluminescent device according to claim 1 or 2, wherein the thickness of the light emitting layer is 10 to 50nm, the thickness of the tuning electrode layer is 10 to 160nm, and the thickness of the electrode layer is 10 to 160 nm.
10. The color tunable coplanar electrode type organic electroluminescent device as defined in claim 1 or 2, wherein the power system applied on the electrode layer is a two-phase sinusoidal ac power system with a frequency of 0.1Hz to 1 MHz; and the power supply system applied on the adjusting electrode layer is a third-phase sine alternating-current power supply system, wherein the frequency is 0.1Hz-1 MHz.
CN201911137146.XA 2019-11-19 2019-11-19 Color-adjustable coplanar electrode type organic electroluminescent device Pending CN111129322A (en)

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CN113423154A (en) * 2021-06-01 2021-09-21 北京大学深圳研究生院 Electroluminescent tetrode integrating light emission, switch and color control and control method thereof
CN114130437A (en) * 2021-11-03 2022-03-04 北京大学深圳研究生院 Electroluminescent micro-fluidic liquid drop moving device

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US20090243466A1 (en) * 2008-03-31 2009-10-01 Shuhei Yokoyama Organic el display device and method of manufacturing the same
CN109326736A (en) * 2018-10-12 2019-02-12 吉林大学 A kind of coplanar electrode type organic electroluminescence device of adjustable color and its application

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CN109326736A (en) * 2018-10-12 2019-02-12 吉林大学 A kind of coplanar electrode type organic electroluminescence device of adjustable color and its application

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113423154A (en) * 2021-06-01 2021-09-21 北京大学深圳研究生院 Electroluminescent tetrode integrating light emission, switch and color control and control method thereof
CN114130437A (en) * 2021-11-03 2022-03-04 北京大学深圳研究生院 Electroluminescent micro-fluidic liquid drop moving device

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Application publication date: 20200508