CN104183778A - Organic electroluminescent device and preparation method thereof - Google Patents

Organic electroluminescent device and preparation method thereof Download PDF

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Publication number
CN104183778A
CN104183778A CN201310198664.9A CN201310198664A CN104183778A CN 104183778 A CN104183778 A CN 104183778A CN 201310198664 A CN201310198664 A CN 201310198664A CN 104183778 A CN104183778 A CN 104183778A
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layer
phthalocyanine
compound
thickness
evaporation
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周明杰
王平
黄辉
陈吉星
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K30/00—Organic devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation
    • H10K30/80—Constructional details
    • H10K30/865—Intermediate layers comprising a mixture of materials of the adjoining active 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
    • H10K50/13—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 comprising stacked EL layers within one EL unit
    • H10K50/131—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 comprising stacked EL layers within one EL unit with spacer layers between the electroluminescent layers
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30—Coordination compounds
    • H10K85/311—Phthalocyanine
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Optics & Photonics (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

Provided is an organic electroluminescent device which comprises an anode, a hole injection layer, a first hole transmission layer, a first luminescent layer, a first electron transmission layer, a charge generation layer, a second hole transmission layer, a second luminescent layer, a second electron transmission layer, an electron injection layer and a cathode which are laminated in turn. The charge generation layer comprises an n-type layer, an intermediate layer and a p-type layer. Material of the n-type layer is bipolar metal oxide doped with caesium salt. Material of the intermediate layer is a phthalocyanine compound doped with caesium salt. Material of the p-type layer is hole transmission material doped with the phthalocyanine compound. The aforementioned organic electroluminescent device is relatively high in luminescence efficiency. The invention also provides a preparation method for the organic electroluminescent device.

Description

Organic electroluminescence device and preparation method thereof
Technical field
The present invention relates to a kind of organic electroluminescence device and preparation method thereof.
Background technology
The principle of luminosity of organic electroluminescence device is based under the effect of extra electric field, and electronics is injected into organic lowest unocccupied molecular orbital (LUMO) from negative electrode, and hole is injected into organic highest occupied molecular orbital (HOMO) from anode.Electronics and hole meet at luminescent layer, compound, form exciton, exciton moves under electric field action, and energy is passed to luminescent material, and excitation electron is from ground state transition to excitation state, excited energy, by Radiation-induced deactivation, produces photon, discharges luminous energy.But the luminous efficiency of organic electroluminescence device is lower at present.
Summary of the invention
Based on this, be necessary to provide organic electroluminescence device that a kind of luminous efficiency is higher and preparation method thereof.
A kind of organic electroluminescence device, comprises the anode stacking gradually, hole injection layer, the first hole transmission layer, the first luminescent layer, the first electron transfer layer, charge generation layer, the second hole transmission layer, the second luminescent layer, the second electron transfer layer, electron injecting layer and negative electrode, described charge generation layer comprises N-shaped layer, intermediate layer and p-type layer, described N-shaped layer material is the bipolarity metal oxide of doping cesium salt, intermediate layer material is the phthalocyanine-like compound of doping cesium salt, p-type layer material is the hole mobile material of doping phthalocyanine-like compound, and wherein, described cesium salt is selected from cesium carbonate, nitrine caesium, in cesium fluoride and cesium chloride at least one, described doping bipolarity metal oxide is selected from molybdenum trioxide, in tungstic acid and vanadic oxide at least one, described cesium salt and described bipolarity metal oxide mass ratio are 1:100～1:10, described phthalocyanine-like compound is selected from CuPc, magnesium phthalocyanine, in Phthalocyanine Zinc and phthalocyanine vanadium at least one, described cesium salt and described phthalocyanine-like compound mass ratio are 1:100～1:10, described hole mobile material is selected from 1,1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane, 4,4', 4''-tri-(carbazole-9-yl) triphenylamine and N, N '-(1-naphthyl)-N, N '-diphenyl-4, in 4 '-benzidine at least one, the mass ratio of described phthalocyanine-like compound and described hole mobile material is 1:10～2:5.
The thickness of described N-shaped layer is 10nm～40nm, and described intermediate layer thickness is 10nm～30nm, and the thickness of described p-type layer is 5nm～40nm.
The material of described the first luminescent layer and described the second luminescent layer is selected from 4-(dintrile methyl)-2-butyl-6-(1,1,7,7-tetramethyl Lip river of a specified duration pyridine-9-vinyl)-4H-pyrans, 9,10-bis--β-naphthylene anthracene, 4, two (the 9-ethyl-3-carbazole vinyl)-1 of 4'-, at least one in 1'-biphenyl and oxine aluminium.
The material of described the first hole transmission layer and described the second hole transmission layer is selected from 1,1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane, 4,4', 4''-tri-(carbazole-9-yl) triphenylamine and N, N '-(1-naphthyl)-N, N '-diphenyl-4, at least one in 4 '-benzidine.
The material of described the first electron transfer layer and described the second electron transfer layer is selected from 4,7-diphenyl-1,10-phenanthroline, 1,2, at least one in 4-triazole derivative and N-aryl benzimidazole.
A preparation method for organic electroluminescence device, comprises the following steps:
Prepare hole injection layer, the first hole transmission layer, the first luminescent layer and the first electron transfer layer at anode surface successively evaporation;
Prepare charge generation layer at described the first electron transfer layer surface evaporation, described charge generation layer comprises N-shaped layer, intermediate layer and p-type layer, described N-shaped layer material is the bipolarity metal oxide of doping cesium salt, intermediate layer material is the phthalocyanine-like compound of doping cesium salt, p-type layer material is the hole mobile material of doping phthalocyanine-like compound, wherein, described cesium salt is selected from cesium carbonate, nitrine caesium, in cesium fluoride and cesium chloride at least one, described doping bipolarity metal oxide is selected from molybdenum trioxide, in tungstic acid and vanadic oxide at least one, described cesium salt and described bipolarity metal oxide mass ratio are 1:100～1:10, described phthalocyanine-like compound is selected from CuPc, magnesium phthalocyanine, in Phthalocyanine Zinc and phthalocyanine vanadium at least one, described cesium salt and described phthalocyanine-like compound mass ratio are 1:100～1:10, described hole mobile material is selected from 1, 1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane, 4, 4', 4''-tri-(carbazole-9-yl) triphenylamine and N, N '-(1-naphthyl)-N, N '-diphenyl-4, in 4 '-benzidine at least one, the mass ratio of described phthalocyanine-like compound and described hole mobile material is 1:10～2:5, evaporation is 2 × 10 at vacuum pressure -3～5 × 10 -5under Pa, carry out, the evaporation speed of organic material is 0.1～1nm/s, and the evaporation speed of metal and metallic compound is 1～10nm/s, and
Form the second hole transmission layer, the second luminescent layer, the second electron transfer layer, electron injecting layer and negative electrode on described charge generation layer surface successively evaporation.
The material of described the first luminescent layer and described the second luminescent layer is selected from 4-(dintrile methyl)-2-butyl-6-(1,1,7,7-tetramethyl Lip river of a specified duration pyridine-9-vinyl)-4H-pyrans, 9,10-bis--β-naphthylene anthracene, 4, two (the 9-ethyl-3-carbazole vinyl)-1 of 4'-, at least one in 1'-biphenyl and oxine aluminium.
The material of described the first hole transmission layer and described the second hole transmission layer is selected from 1,1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane, 4,4', 4''-tri-(carbazole-9-yl) triphenylamine and N, N '-(1-naphthyl)-N, N '-diphenyl-4, at least one in 4 '-benzidine.
The thickness of described N-shaped layer is 10nm～40nm, and described intermediate layer thickness is 10nm～30nm, and the thickness of described p-type layer is 5nm～40nm.
Before described anode surface forms hole injection layer, first antianode carries out pre-treatment, pre-treatment comprises: anode is carried out to photoetching treatment, be cut into needed size, adopt liquid detergent, deionized water, acetone, ethanol, the each Ultrasonic Cleaning 15min of isopropyl acetone, to remove the organic pollution of anode surface.
Above-mentioned organic electroluminescence device and preparation method thereof, charge generation layer is by comprising N-shaped layer, intermediate layer and p-type layer form, wherein, N-shaped layer is adulterated by bipolarity metal oxide and cesium salt, bipolarity metal oxide can provide electronics and hole, can electron transport material after cesium salt doping in conjunction with closely, form N-shaped layer, can further improve electric transmission speed, improve electron density, intermediate layer is phthalocyanine-like compound and cesium salt composition, phthalocyanine-like compound can provide hole, cesium salt provides electronics, both mutually adulterate laggard line space cave and duplets, phthalocyanine-like compound has crystallinity, after crystallization, light is carried out to scattering, and p-type layer adopts phthalocyanine-like compound and hole mobile material to adulterate, the HOMO energy level of phthalocyanine-like compound mates with the HOMO energy level of hole mobile material, can improve hole transport speed, this charge generation layer can effectively improve the luminous efficiency of organic electroluminescence device.
Brief description of the drawings
Fig. 1 is the structural representation of the organic electroluminescence device of an execution mode;
Fig. 2 is the preparation method's of the organic electroluminescence device of an execution mode flow chart;
Fig. 3 is current density and the current efficiency graph of a relation of the organic electroluminescence device prepared of embodiment 1.
Embodiment
Below in conjunction with the drawings and specific embodiments, organic electroluminescence device and preparation method thereof is further illustrated.
Refer to Fig. 1, the organic electroluminescence device 100 of one execution mode comprises the anode 10, hole injection layer 20, the first hole transmission layer 32, the first luminescent layer 34, the first electron transfer layer 36, charge generation layer 40, the second hole transmission layer 52, the second luminescent layer 54, the second electron transfer layer 56, electron injecting layer 60 and the negative electrode 70 that stack gradually, charge generation layer 40 comprises N-shaped layer 401, intermediate layer 402 and p-type layer 403.
Anode 10 is indium tin oxide glass (ITO), aluminium zinc oxide glass (AZO) or indium-zinc oxide glass (IZO), is preferably ITO.
Hole injection layer 20 is formed at anode 10 surfaces.The material of hole injection layer 20 is selected from molybdenum trioxide (MoO 3), tungstic acid (WO 3) and vanadic oxide (V 2o 5) at least one, be preferably MoO 3.The thickness of hole injection layer 20 is 20nm～80nm, is preferably 30nm.
The first hole transmission layer 32 is formed at the surface of hole injection layer 20.The material of the first hole transmission layer 32 is selected from 1,1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane (TAPC), 4,4', 4''-tri-(carbazole-9-yl) triphenylamine (TCTA) and N, N '-(1-naphthyl)-N, N '-diphenyl-4, at least one in 4 '-benzidine (NPB), is preferably NPB.The thickness of the first hole transmission layer 32 is 20nm～60nm, is preferably 40nm.
The first luminescent layer 34 is formed at the surface of the first hole transmission layer 32.The material of the first luminescent layer 34 is selected from 4-(dintrile methyl)-2-butyl-6-(1,1,7,7-tetramethyl Lip river of a specified duration pyridine-9-vinyl)-4H-pyrans (DCJTB), 9,10-bis--β-naphthylene anthracene (ADN), 4, two (the 9-ethyl-3-carbazole vinyl)-1 of 4'-, 1'-biphenyl (BCzVBi) and 8-hydroxyquinoline aluminum (Alq 3) at least one, be preferably BCzVBi.The thickness of luminescent layer 40 is 5nm～40nm, is preferably 20nm.
The first electron transfer layer 36 is formed at the surface of the first luminescent layer 32.The material of the first electron transfer layer 36 is selected from 4,7-diphenyl-1,10-phenanthroline (Bphen), 1,2, and at least one in 4-triazole derivative (as TAZ) and N-aryl benzimidazole (TPBI), is preferably Bphen.The thickness of the first electron transfer layer 36 is 40nm～300nm, is preferably 100nm.
Charge generation layer 40 is formed at the surface of the first electron transfer layer 36.Charge generation layer 40, charge generation layer 40 comprises N-shaped layer 401, intermediate layer 402 and p-type layer 403, described N-shaped layer 401 material are the bipolarity metal oxide of doping cesium salt, intermediate layer 402 materials are the phthalocyanine-like compound of doping cesium salt, p-type layer 403 material are the hole mobile material of doping phthalocyanine-like compound, and wherein, described cesium salt is selected from cesium fluoride (CsF), cesium carbonate (Cs 2cO 3), nitrine caesium (CsN 3) and cesium chloride (CsCl) at least one, described bipolarity metal oxide is selected from molybdenum trioxide (MoO 3), tungstic acid (WO 3) and vanadic oxide (V 2o 5) at least one, described cesium salt and described bipolarity metal oxide mass ratio are 1:100～1:10, phthalocyanine-like compound is selected from CuPc (CuPc), magnesium phthalocyanine (MgPc), in Phthalocyanine Zinc (ZnPc) and phthalocyanine vanadium (VPc) at least one, described cesium salt and described phthalocyanine-like compound mass ratio are 1:100～1:10, described hole mobile material is selected from 1, 1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane (TAPC), 4, 4', 4''-tri-(carbazole-9-yl) triphenylamine (TCTA) and N, N '-(1-naphthyl)-N, N '-diphenyl-4, in 4 '-benzidine (NPB) at least one, the mass ratio of described phthalocyanine-like compound and described hole mobile material is 1:10～2:5.The thickness of N-shaped layer 401 is 10nm～40nm, and described intermediate layer 402 thickness are 10nm～30nm, and the thickness of described p-type layer 403 is 5nm～40nm.
The second hole transmission layer 52 is formed at the surface of charge generation layer 40.The material of the second hole transmission layer 52 is selected from 1,1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane (TAPC), 4,4', 4''-tri-(carbazole-9-yl) triphenylamine (TCTA) and N, N '-(1-naphthyl)-N, N '-diphenyl-4, at least one in 4 '-benzidine (NPB), is preferably TCTA.The thickness of the second hole transmission layer 52 is 20nm～60nm, is preferably 30nm.
The second luminescent layer 54 is formed at the surface of the second hole transmission layer 52.The material of the second luminescent layer 54 is selected from 4-(dintrile methyl)-2-butyl-6-(1,1,7,7-tetramethyl Lip river of a specified duration pyridine-9-vinyl)-4H-pyrans (DCJTB), 9,10-bis--β-naphthylene anthracene (ADN), 4, two (the 9-ethyl-3-carbazole vinyl)-1 of 4'-, 1'-biphenyl (BCzVBi) and 8-hydroxyquinoline aluminum (Alq 3) at least one, be preferably BCzVBi.The thickness of luminescent layer 40 is 5nm～40nm, is preferably 20nm.
The second electron transfer layer 56 is formed at the surface of the second luminescent layer 52.The material of the second electron transfer layer 56 is selected from 4,7-diphenyl-1,10-phenanthroline (Bphen), 1,2, and at least one in 4-triazole derivative (as TAZ) and N-aryl benzimidazole (TPBI), is preferably TAZ.The thickness of the second electron transfer layer 56 is 40nm～300nm, is preferably 100nm.
Electron injecting layer 60 is formed at the second electron transfer layer 56 surfaces.The material of electron injecting layer 60 is selected from cesium carbonate (Cs 2cO 3), cesium fluoride (CsF), nitrine caesium (CsN 3) and lithium fluoride (LiF) at least one, be preferably LiF.The thickness of electron injecting layer 60 is 0.5nm～10nm, is preferably 1nm.
Negative electrode 70 is formed at electron injecting layer 60 surfaces.The material of negative electrode 70 is selected from least one in silver (Ag), aluminium (Al), platinum (Pt) and gold (Au), is preferably Al.The thickness of negative electrode 70 is 60nm～300nm, is preferably 150nm.
Above-mentioned organic electroluminescence device 100, charge generation layer 40 is by comprising N-shaped layer 401, intermediate layer 402 and p-type layer 403 form, wherein, N-shaped layer 401 is adulterated by bipolarity metal oxide and cesium salt, bipolarity metal oxide can provide electronics and hole, can electron transport material after cesium salt doping in conjunction with closely, form N-shaped layer 401, can further improve electric transmission speed, improve electron density, intermediate layer 402 is phthalocyanine-like compound and cesium salt composition, phthalocyanine-like compound can provide hole, cesium salt provides electronics, both mutually adulterate laggard line space cave and duplets, phthalocyanine-like compound has crystallinity, after crystallization, light is carried out to scattering, and p-type layer 403 adopts phthalocyanine-like compound and hole mobile material to adulterate, the HOMO energy level of phthalocyanine-like compound mates with the HOMO energy level of hole mobile material, can improve hole transport speed, this charge generation layer 40 can effectively improve the luminous efficiency of organic electroluminescence device 100, organic electroluminescence device 100 has two luminescence units simultaneously, thereby has brightness and luminous efficiency at double.
Be appreciated that other functional layers also can be set in this organic electroluminescence device 100 as required.
Please refer to Fig. 2, the preparation method of the organic electroluminescence device 100 of an embodiment, it comprises the following steps:
Step S110, prepare hole injection layer 20, the first hole transmission layer 32, the first luminescent layer 34 and the first electron transfer layer 36 at anode surface successively evaporation.
Anode 10 is indium tin oxide glass (ITO), aluminium zinc oxide glass (AZO) or indium-zinc oxide glass (IZO), is preferably ITO.
In present embodiment, before anode 10 surfaces form hole injection layer 20, first antianode 10 carries out pre-treatment, pre-treatment comprises: anode 10 is carried out to photoetching treatment, be cut into needed size, adopt liquid detergent, deionized water, acetone, ethanol, the each Ultrasonic Cleaning 15min of isopropyl acetone, to remove the organic pollution on anode 10 surfaces.
Hole injection layer 20 is formed at the surface of anode 10.Hole injection layer 20 is prepared by evaporation.The material of hole injection layer 20 is selected from molybdenum trioxide (MoO 3), tungstic acid (WO 3) and vanadic oxide (V 2o 5) at least one, be preferably MoO 3.The thickness of hole injection layer 20 is 20nm～80nm, is preferably 30nm.Evaporation is 2 × 10 at vacuum pressure -3pa～5 × 10 -5under Pa, carry out, evaporation speed is 0.1nm/s～1nm/s.
The first hole transmission layer 32 is formed at the surface of hole injection layer 20.The first hole transmission layer 32 is prepared by evaporation.The material of the first hole transmission layer 32 is selected from 1,1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane (TAPC), 4,4', 4''-tri-(carbazole-9-yl) triphenylamine (TCTA) and N, N '-(1-naphthyl)-N, N '-diphenyl-4, at least one in 4 '-benzidine (NPB), is preferably TAPC.The thickness of the first hole transmission layer 32 is 20nm～60nm, is preferably 40nm.Evaporation is 2 × 10 at vacuum pressure -3pa～5 × 10 -5under Pa, carry out, evaporation speed is 0.1nm/s～1nm/s.
The first luminescent layer 34 is formed at the surface of the first hole transmission layer 32.The first luminescent layer 34 is prepared by evaporation.The material of the first luminescent layer 34 is selected from 4-(dintrile methyl)-2-butyl-6-(1,1,7,7-tetramethyl Lip river of a specified duration pyridine-9-vinyl)-4H-pyrans (DCJTB), 9,10-bis--β-naphthylene anthracene (ADN), 4, two (the 9-ethyl-3-carbazole vinyl)-1 of 4'-, 1'-biphenyl (BCzVBi) and 8-hydroxyquinoline aluminum (Alq 3) at least one, be preferably BCzVBi.The thickness of luminescent layer 40 is 5nm～40nm, is preferably 20nm.Evaporation is 2 × 10 at vacuum pressure -3pa～5 × 10 -5under Pa, carry out, evaporation speed is 0.1nm/s～1nm/s.
The first electron transfer layer 36 is formed at the surface of the first luminescent layer 32.The first electron transfer layer 36 is prepared by evaporation.The material of the first electron transfer layer 36 is selected from 4,7-diphenyl-1,10-phenanthroline (Bphen), 1,2, and at least one in 4-triazole derivative (as TAZ) and N-aryl benzimidazole (TPBI), is preferably Bphen.The thickness of the first electron transfer layer 36 is 40nm～300nm, is preferably 100nm.Evaporation is 2 × 10 at vacuum pressure -3pa～5 × 10 -5under Pa, carry out, evaporation speed is 0.1nm/s～1nm/s.
Step S120, prepare charge generation layer 40 at the surperficial evaporation of the first electron transfer layer 36.
Charge generation layer 40 is formed at the surface of the first electron transfer layer 36, charge generation layer 40 comprises N-shaped layer 401, intermediate layer 402 and p-type layer 403, described N-shaped layer 401 material are the bipolarity metal oxide of doping cesium salt, intermediate layer 402 materials are the phthalocyanine-like compound of doping cesium salt, p-type layer 403 material are the hole mobile material of doping phthalocyanine-like compound, and wherein, described cesium salt is selected from cesium fluoride (CsF), cesium carbonate (Cs 2cO 3), nitrine caesium (CsN 3) and cesium chloride (CsCl) at least one, described bipolarity metal oxide is selected from molybdenum trioxide (MoO 3), tungstic acid (WO 3) and vanadic oxide (V 2o 5) at least one, described cesium salt and described bipolarity metal oxide mass ratio are 1:100～1:10, phthalocyanine-like compound is selected from CuPc (CuPc), magnesium phthalocyanine (MgPc), in Phthalocyanine Zinc (ZnPc) and phthalocyanine vanadium (VPc) at least one, described cesium salt and described phthalocyanine-like compound mass ratio are 1:100～1:10, described hole mobile material is selected from 1, 1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane (TAPC), 4, 4', 4''-tri-(carbazole-9-yl) triphenylamine (TCTA) and N, N '-(1-naphthyl)-N, N '-diphenyl-4, in 4 '-benzidine (NPB) at least one, the mass ratio of described phthalocyanine-like compound and described hole mobile material is 1:10～2:5.The thickness of N-shaped layer 401 is 10nm～40nm, and described intermediate layer 402 thickness are 10nm～30nm, and the thickness of described p-type layer 403 is 5nm～40nm.Evaporation is 2 × 10 at vacuum pressure -3～5 × 10 -5under Pa, carry out, the evaporation speed of organic material is 0.1～1nm/s, and the evaporation speed of metal and metallic compound is 1～10nm/s.
Step S130, prepare the second hole transmission layer 52, the second luminescent layer 54, the second electron transfer layer 56, electron injecting layer 60 and negative electrode 70 on charge generation layer surface successively evaporation.
The second hole transmission layer 52 is formed at the surface of doped zinc oxide diamicton 403.The material of the second hole transmission layer 52 is selected from 1,1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane (TAPC), 4,4', 4''-tri-(carbazole-9-yl) triphenylamine (TCTA) and N, N '-(1-naphthyl)-N, N '-diphenyl-4, at least one in 4 '-benzidine (NPB), is preferably TCTA.The thickness of the second hole transmission layer 52 is 20nm～60nm, is preferably 30nm.Evaporation is 2 × 10 at vacuum pressure -3～5 × 10 -5under Pa, carry out, evaporation speed is 0.1nm/s～1nm/s.
The second luminescent layer 54 is formed at the surface of the second hole transmission layer 52.The material of the second luminescent layer 54 is selected from 4-(dintrile methyl)-2-butyl-6-(1,1,7,7-tetramethyl Lip river of a specified duration pyridine-9-vinyl)-4H-pyrans (DCJTB), 9,10-bis--β-naphthylene anthracene (ADN), 4, two (the 9-ethyl-3-carbazole vinyl)-1 of 4'-, 1'-biphenyl (BCzVBi) and 8-hydroxyquinoline aluminum (Alq 3) at least one, be preferably BCzVBi.The thickness of luminescent layer 40 is 5nm～40nm, is preferably 20nm.Evaporation is 2 × 10 at vacuum pressure -3～5 × 10 -5under Pa, carry out, evaporation speed is 0.1nm/s～1nm/s.
The second electron transfer layer 56 is formed at the surface of the second luminescent layer 52.The material of the second electron transfer layer 56 is selected from 4,7-diphenyl-1,10-phenanthroline (Bphen), 1,2, and at least one in 4-triazole derivative (as TAZ) and N-aryl benzimidazole (TPBI), is preferably TAZ.The thickness of the second electron transfer layer 56 is 40nm～300nm, is preferably 100nm.Evaporation is 2 × 10 at vacuum pressure -3～5 × 10 -5under Pa, carry out, evaporation speed is 0.1nm/s～1nm/s.
Electron injecting layer 60 is formed at the second electron transfer layer 56 surfaces.The material of electron injecting layer 60 is selected from cesium carbonate (Cs 2cO 3), cesium fluoride (CsF), nitrine caesium (CsN 3) and lithium fluoride (LiF) at least one, be preferably LiF.The thickness of electron injecting layer 60 is 0.5nm～10nm, is preferably 1nm.Evaporation is 2 × 10 at vacuum pressure -3～5 × 10 -5under Pa, carry out, evaporation speed is 0.1nm/s～1nm/s.
Negative electrode 70 is formed at electron injecting layer 60 surfaces.The material of negative electrode 70 is selected from least one in silver (Ag), aluminium (Al), platinum (Pt) and gold (Au), is preferably Al.The thickness of negative electrode 70 is 60nm～300nm, is preferably 150nm.Evaporation is 2 × 10 at vacuum pressure -3～5 × 10 -5under Pa, carry out, evaporation speed is 1nm/s～10nm/s.
Above-mentioned organic electroluminescence device preparation method, technique is simple, and the luminous efficiency of the organic electroluminescence device of preparation is higher.
Below in conjunction with specific embodiment, the preparation method of organic electroluminescence device provided by the invention is elaborated.
The preparation used of the embodiment of the present invention and comparative example and tester are: high vacuum coating system (scientific instrument development center, Shenyang Co., Ltd), the USB4000 fiber spectrometer testing electroluminescent spectrum of U.S. marine optics Ocean Optics, the Keithley2400 test electric property of Keithley company of the U.S., CS-100A colorimeter test brightness and the colourity of Japanese Konica Minolta company.
Embodiment 1
Structure prepared by the present embodiment is ITO/WO 3/ TCTA/BCzVBi/Bphen/CsF:MoO 3the organic electroluminescence device of/CsF:CuPc/CuPc:NPB/TCTA/BCzVBi/TAZ/LiF/Al.Wherein, "/" presentation layer stack structure, ": " represents doping or mixes, following examples are identical.
First ITO is carried out to photoetching treatment, be cut into needed size, use successively liquid detergent, deionized water, acetone, ethanol, the each ultrasonic 15min of isopropyl alcohol, the organic pollution of removal glass surface; Evaporation hole injection layer, material is WO 3, thickness is 30nm; Evaporation the first hole transmission layer, material is TCTA, thickness is 40nm; Evaporation the first luminescent layer, material is BCzVBi, thickness is 20nm; Evaporation the first electron transfer layer, material is Bphen, thickness is 100nm; Evaporation charge generation layer, N-shaped layer is CsF:MoO 3, CsF and MoO 3mass ratio is 1:20, and thickness is 15nm, and intermediate layer material is CsF:CuPc, and CsF and CuPc mass ratio are 1:50, and thickness is 20nm, and p-type layer material is CuPc:NPB, and CuPc and NPB mass ratio are 1:4, and thickness is 20nm; Evaporation the second hole transmission layer, material is NPB, thickness is 30nm; Evaporation the second luminescent layer, material is BCzVBi, thickness is 20nm; Evaporation the second electron transfer layer, material is TPBi, thickness is 100nm; Evaporation electron injecting layer, material is LiF, thickness is 1nm; Evaporation negative electrode, material is Al, thickness is 150nm.Finally obtain needed electroluminescent device.Evaporation is 8 × 10 at vacuum pressure -5under Pa, carry out, the evaporation speed of organic material is 0.2nm/s, and the evaporation speed of metal and metallic compound is 3nm/s.
Refer to Fig. 3, the structure that is depicted as preparation in embodiment 1 is ITO/WO 3/ TCTA/BCzVBi/Bphen/CsF:MoO 3the organic electroluminescence device (curve 1) of/CsF:CuPc/CuPc:NPB/NPB/BCzVBi/TPBi/LiF/Al is ito glass/WO with structure prepared by comparative example 3/ NPB/BCzVBi/TPBi/LiF/Al(curve 2) current density and the relation of current efficiency.In the organic electroluminescence device that in organic electroluminescence device prepared by comparative example, each layer thickness is prepared with embodiment 1, each layer thickness is identical.
As seen from Figure 3, under different current densities, all large than comparative example of the current efficiency of embodiment 1, the maximum current efficiency of organic electroluminescence device prepared by embodiment 1 is 6.1cd/A, and the current efficiency of organic electroluminescence device prepared by comparative example is only 4.1cd/A, and the current efficiency of comparative example along with the increase of brightness fast-descending, this explanation, charge generation layer is by comprising N-shaped layer, intermediate layer and p-type layer form, wherein, N-shaped layer is adulterated by bipolarity metal oxide and cesium salt, bipolarity metal oxide can provide electronics and hole, can electron transport material after cesium salt doping in conjunction with closely, form N-shaped layer, can further improve electric transmission speed, improve electron density, intermediate layer is phthalocyanine-like compound and cesium salt composition, phthalocyanine-like compound can provide hole, cesium salt provides electronics, both mutually adulterate laggard line space cave and duplets, phthalocyanine-like compound has crystallinity, after crystallization, light is carried out to scattering, and p-type layer adopts phthalocyanine-like compound and hole mobile material to adulterate, the HOMO energy level of phthalocyanine-like compound mates with the HOMO energy level of hole mobile material, can improve hole transport speed, this charge generation layer can effectively improve the luminous efficiency of organic electroluminescence device.
The current efficiency of the organic electroluminescence device that below prepared by each embodiment is all similar with embodiment 1, and each organic electroluminescence device also has similar current efficiency, repeats no more below.
Embodiment 2
Structure prepared by the present embodiment is AZO/WO 3/ TCTA/ADN/TPBi/Cs 2cO 3: WO 3/ CsN 3: MgPc/MgPc:TCTA/NPB/ADN/TAZ/CsN 3the organic electroluminescence device of/Pt.
First AZO substrate of glass is used to liquid detergent successively, deionized water, ultrasonic 15min, the organic pollution of removal glass surface; Evaporation is prepared hole injection layer, and material is WO 3, thickness is 80nm; Evaporation is prepared the first hole transmission layer, and material is TCTA, and thickness is 60nm; Evaporation is prepared the first luminescent layer, and material is ADN, and thickness is 5nm; Evaporation is prepared the first electron transfer layer, and material is TPBi, and thickness is 200nm; Evaporation charge generation layer, N-shaped layer is Cs 2cO 3: WO 3, Cs 2cO 3with WO 3mass ratio is 1:100, and thickness is 10nm, and intermediate layer material is CsN 3: MgPc, CsN 3with MgPc mass ratio be 1:100, thickness is 30nm, p-type layer is MgPc:TCTA, MgPc and TCTA mass ratio are 2:5, thickness is 5nm; Evaporation is prepared the second hole transmission layer, and material is NPB, and thickness is 20nm, the second luminescent layer, and material is ADN, thickness is 7nm; Evaporation is prepared the second electron transfer layer, and material is TAZ, and thickness is 40nm; Evaporation is prepared electron injecting layer, and material is CsN 3, thickness is 0.5nm; Evaporation is prepared negative electrode, and material is Pt, and thickness is 60nm, finally obtains needed electroluminescent device.Evaporation is 2 × 10 at vacuum pressure -3under Pa, carry out, the evaporation speed of organic material is 0.1nm/s, and the evaporation speed of metal and metallic compound is 10nm/s.
Embodiment 3
Structure prepared by the present embodiment is IZO/WO 3/ NPB/Alq 3/ TAZ/CsN 3: V 2o 5/ Cs 2cO 3: ZnPc/VPc:TAPC/TAPC/Alq 3the organic electroluminescence device of/Bphen/CsF/Ag.
First IZO substrate of glass is used to liquid detergent successively, deionized water, ultrasonic 15min, the organic pollution of removal glass surface; Evaporation is prepared hole injection layer, and material is WO 3, thickness is 20nm; Evaporation is prepared the first hole transmission layer, and material is NPB, and thickness is 30nm; Evaporation is prepared the first luminescent layer, and material is Alq 3, thickness is 40nm; Evaporation is prepared the first electron transfer layer, and material is TAZ, and thickness is 60nm; Evaporation is prepared charge generation layer, and N-shaped layer is CsN 3: V 2o 5, CsN 3with V 2o 5mass ratio is 1:10, and thickness is 40nm, and intermediate layer material is Cs 2cO 3: ZnPc, Cs 2cO 3with ZnPc mass ratio be 1:10, thickness is 10nm, p-type layer is VPc:TAPC, VPc and TAPC mass ratio are 1:10, thickness is 40nm; Evaporation is prepared the second hole transmission layer, and material is TAPC, and thickness is 200nm; Evaporation is prepared the second luminescent layer, and material is Alq 3, thickness is 30nm; Evaporation is prepared the second electron transfer layer, and material is Bphen, and thickness is 40nm; Evaporation is prepared electron injecting layer, and material is CsF, and thickness is 0.5nm; Evaporation is prepared negative electrode, and material is Ag, and thickness is 300nm, finally obtains needed electroluminescent device.Evaporation is 5 × 10 at vacuum pressure -5under Pa, carry out, the evaporation speed of organic material is 1nm/s, and the evaporation speed of metal and metallic compound is 1nm/s.
Embodiment 4
Structure prepared by the present embodiment is IZO/V 2o 5/ TAPC/DCJTB/TPBi/CsCl:WO 3/ HfB 2: Au/TCTA:MoO 3/ TAPC/DCJTB/TAZ/Cs 2cO 3the organic electroluminescence device of/Au.
First IZO substrate of glass is used to liquid detergent successively, deionized water, ultrasonic 15min, the organic pollution of removal glass surface; Evaporation is prepared hole injection layer, and material is V 2o 5, thickness is 30nm; Evaporation is prepared the first hole transmission layer, and material is TAPC, and thickness is 50nm; Evaporation is prepared the first luminescent layer, and material is DCJTB, and thickness is 5nm; Evaporation is prepared the first electron transfer layer, and material is TPBi, and thickness is 40nm; Evaporation is prepared charge generation layer, and N-shaped layer is CsCl:WO 3, CsCl and WO 3mass ratio is 7:100, thickness 15nm, and intermediate layer material is CsCl:VPc, and between CsCl and VPc, mass ratio is 1:20, and thickness is 20nm, and p-type layer is ZnPc:NPB, and ZnPc and NPB mass ratio are 7:20, and thickness is 10nm; Evaporation is prepared the second hole transmission layer, and material is NPB, and thickness is 50nm, the second luminescent layer, and material is DCJTB, thickness is 5nm; Evaporation is prepared the second electron transfer layer, and material is TPBi, and thickness is 80nm; Evaporation is prepared electron injecting layer, and material is Cs 2cO 3, thickness is 2nm; Evaporation is prepared negative electrode, and material is Au, and thickness is 100nm, finally obtains needed electroluminescent device.Evaporation is 5 × 10 at vacuum pressure -4under Pa, carry out, the evaporation speed of organic material is 0.2nm/s, and the evaporation speed of metal and metallic compound is 5nm/s.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.

Claims (10)

1. an organic electroluminescence device, it is characterized in that, comprise the anode stacking gradually, hole injection layer, the first hole transmission layer, the first luminescent layer, the first electron transfer layer, charge generation layer, the second hole transmission layer, the second luminescent layer, the second electron transfer layer, electron injecting layer and negative electrode, described charge generation layer comprises N-shaped layer, intermediate layer and p-type layer, described N-shaped layer material is the bipolarity metal oxide of doping cesium salt, intermediate layer material is the phthalocyanine-like compound of doping cesium salt, p-type layer material is the hole mobile material of doping phthalocyanine-like compound, wherein, described cesium salt is selected from cesium carbonate, nitrine caesium, in cesium fluoride and cesium chloride at least one, described doping bipolarity metal oxide is selected from molybdenum trioxide, in tungstic acid and vanadic oxide at least one, described cesium salt and described bipolarity metal oxide mass ratio are 1:100～1:10, described phthalocyanine-like compound is selected from CuPc, magnesium phthalocyanine, in Phthalocyanine Zinc and phthalocyanine vanadium at least one, described cesium salt and described phthalocyanine-like compound mass ratio are 1:100～1:10, described hole mobile material is selected from 1, 1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane, 4, 4', 4''-tri-(carbazole-9-yl) triphenylamine and N, N '-(1-naphthyl)-N, N '-diphenyl-4, in 4 '-benzidine at least one, the mass ratio of described phthalocyanine-like compound and described hole mobile material is 1:10～2:5.
2. organic electroluminescence device according to claim 1, is characterized in that, the thickness of described N-shaped layer is 10nm～40nm, and described intermediate layer thickness is 10nm～30nm, and the thickness of described p-type layer is 5nm～40nm.
3. organic electroluminescence device according to claim 1, it is characterized in that, the material of described the first luminescent layer and described the second luminescent layer is selected from 4-(dintrile methyl)-2-butyl-6-(1,1,7,7-tetramethyl Lip river of a specified duration pyridine-9-vinyl)-4H-pyrans, 9,10-bis--β-naphthylene anthracene, 4, two (the 9-ethyl-3-carbazole vinyl)-1 of 4'-, at least one in 1'-biphenyl and oxine aluminium.
4. organic electroluminescence device according to claim 1, it is characterized in that, the material of described the first hole transmission layer and described the second hole transmission layer is selected from 1,1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane, 4,4', 4''-tri-(carbazole-9-yl) triphenylamine and N, N '-(1-naphthyl)-N, N '-diphenyl-4, at least one in 4 '-benzidine.
5. organic electroluminescence device according to claim 1, is characterized in that, the material of described the first electron transfer layer and described the second electron transfer layer is selected from 4,7-diphenyl-1,10-phenanthroline, 1,2, at least one in 4-triazole derivative and N-aryl benzimidazole.
6. a preparation method for organic electroluminescence device, is characterized in that, comprises the following steps:
Prepare hole injection layer, the first hole transmission layer, the first luminescent layer and the first electron transfer layer at anode surface successively evaporation;
Prepare charge generation layer at described the first electron transfer layer surface evaporation, described charge generation layer comprises N-shaped layer, intermediate layer and p-type layer, described N-shaped layer material is the bipolarity metal oxide of doping cesium salt, intermediate layer material is the phthalocyanine-like compound of doping cesium salt, p-type layer material is the hole mobile material of doping phthalocyanine-like compound, wherein, described cesium salt is selected from cesium carbonate, nitrine caesium, in cesium fluoride and cesium chloride at least one, described doping bipolarity metal oxide is selected from molybdenum trioxide, in tungstic acid and vanadic oxide at least one, described cesium salt and described bipolarity metal oxide mass ratio are 1:100～1:10, described phthalocyanine-like compound is selected from CuPc, magnesium phthalocyanine, in Phthalocyanine Zinc and phthalocyanine vanadium at least one, described cesium salt and described phthalocyanine-like compound mass ratio are 1:100～1:10, described hole mobile material is selected from 1, 1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane, 4, 4', 4''-tri-(carbazole-9-yl) triphenylamine and N, N '-(1-naphthyl)-N, N '-diphenyl-4, in 4 '-benzidine at least one, the mass ratio of described phthalocyanine-like compound and described hole mobile material is 1:10～2:5, evaporation is 2 × 10 at vacuum pressure -3～5 × 10 -5under Pa, carry out, the evaporation speed of organic material is 0.1～1nm/s, and the evaporation speed of metal and metallic compound is 1～10nm/s, and
Form the second hole transmission layer, the second luminescent layer, the second electron transfer layer, electron injecting layer and negative electrode on described charge generation layer surface successively evaporation.
7. the preparation method of organic electroluminescence device according to claim 6, it is characterized in that, the material of described the first luminescent layer and described the second luminescent layer is selected from 4-(dintrile methyl)-2-butyl-6-(1,1,7,7-tetramethyl Lip river of a specified duration pyridine-9-vinyl)-4H-pyrans, 9,10-bis--β-naphthylene anthracene, 4, two (the 9-ethyl-3-carbazole vinyl)-1 of 4'-, at least one in 1'-biphenyl and oxine aluminium.
8. the preparation method of organic electroluminescence device according to claim 6, it is characterized in that, the material of described the first hole transmission layer and described the second hole transmission layer is selected from 1,1-bis-[4-[N, N '-bis-(p-tolyl) amino] phenyl] cyclohexane, 4,4', 4''-tri-(carbazole-9-yl) triphenylamine and N, N '-(1-naphthyl)-N, N '-diphenyl-4, at least one in 4 '-benzidine.
9. the preparation method of organic electroluminescence device according to claim 6, is characterized in that, the thickness of described N-shaped layer is 10nm～40nm, and described intermediate layer thickness is 10nm～30nm, and the thickness of described p-type layer is 5nm～40nm.
10. the preparation method of organic electroluminescence device according to claim 6, it is characterized in that, before described anode surface forms hole injection layer, first antianode carries out pre-treatment, pre-treatment comprises: anode is carried out to photoetching treatment, be cut into needed size, adopt liquid detergent, deionized water, acetone, ethanol, the each Ultrasonic Cleaning 15min of isopropyl acetone, to remove the organic pollution of anode surface.
CN201310198664.9A 2013-05-24 2013-05-24 Organic electroluminescent device and preparation method thereof Pending CN104183778A (en)

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Application publication date: 20141203