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Organic electroluminescent device and preparation method thereof

An electroluminescent device and luminescent technology, which is applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problem of low luminous efficiency

Inactive Publication Date: 2014-12-03
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the luminous efficiency of organic electroluminescent devices is low at present

Method used

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  • Organic electroluminescent device and preparation method thereof
  • Organic electroluminescent device and preparation method thereof
  • Organic electroluminescent device and preparation method thereof

Examples

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preparation example Construction

[0036] Please also see figure 2 , the preparation method of the organic electroluminescent device 100 of an embodiment, it comprises the following steps:

[0037] Step S110 , sequentially vapor-depositing the hole injection layer 20 , the first hole transport layer 32 , the first light emitting layer 34 and the first electron transport layer 36 on the surface of the anode.

[0038] The anode 10 is indium tin oxide glass (ITO), aluminum zinc oxide glass (AZO) or indium zinc oxide glass (IZO), preferably ITO.

[0039] In this embodiment, before the hole injection layer 20 is formed on the surface of the anode 10, the anode 10 is pretreated. The pretreatment includes: performing photolithography on the anode 10, cutting it into the required size, using detergent, deionized Water, acetone, ethanol, and isopropanone were each ultrasonically cleaned for 15 minutes to remove organic pollutants on the surface of the anode 10 .

[0040] The hole injection layer 20 is formed on the s...

Embodiment 1

[0056] The structure prepared in this example is ITO / MoO 3 / NPB / BCzVBi / Bphen / CsF:PC61BM / HfO 2 :Ag / NPB:MoO 3 / TCTA / BCzVBi / TAZ / LiF / Al organic electroluminescent devices. Wherein, " / " indicates a stacked structure, and ":" indicates doping or mixing, and the following embodiments are the same.

[0057] First carry out photolithography treatment on ITO, cut it into the required size, and then use detergent, deionized water, acetone, ethanol, and isopropanol to sonicate for 15 minutes each to remove organic pollutants on the glass surface; evaporate the hole injection layer , the material is MoO 3 , the thickness is 30nm; evaporate the first hole transport layer, the material is NPB, the thickness is 40nm; evaporate the first light-emitting layer, the material is BCzVBi, the thickness is 20nm; evaporate the first electron transport layer, the material is Bphen, the thickness is 100nm; evaporated charge generation layer, the n-type layer is CsF:PC61BM, the mass ratio of CsF to P...

Embodiment 2

[0062] The structure prepared in this example is AZO / WO 3 / TCTA / ADN / TPBi / Cs 2 CO 3 :PC71BM / HfB 2 :Al / TCTA:V 2 o 5 / NPB / ADN / TAZ / CsN 3 / Pt organic electroluminescent devices.

[0063] First, the AZO glass substrate was washed with detergent, deionized water, and ultrasonic for 15 minutes to remove organic pollutants on the glass surface; the hole injection layer was prepared by evaporation, and the material was WO 3 , the thickness is 80nm; the first hole transport layer is prepared by evaporation, the material is TCTA, and the thickness is 60nm; the first light-emitting layer is prepared by evaporation, the material is ADN, and the thickness is 5nm; the first electron transport layer is prepared by evaporation, and the material is TPBi, thickness 200nm; evaporated charge generation layer, n-type layer is Cs 2 CO 3 :PC71BM, Cs 2 CO 3 The mass ratio to PC71BM is 1:10, the thickness is 60nm, and the middle layer material is HfB 2 : Al, HfB 2 The mass ratio to Al is 1:1...

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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 a fullerene derivative doped with caesium salt. Material of the intermediate layer is a metal doped with hafnium compounds. Material of the p-type layer is hole transmission material doped with bipolar metal oxide. The aforementioned organic electroluminescent device is relatively high in luminescence efficiency. The invention also provides a preparation method for the organic electroluminescent device.

Description

technical field [0001] The invention relates to an organic electroluminescence device and a preparation method thereof. Background technique [0002] The luminescence principle of organic electroluminescent devices is based on the action of an external electric field, electrons are injected from the cathode to the lowest unoccupied molecular orbital (LUMO) of organic matter, and holes are injected from the anode to the highest occupied molecular orbital (HOMO) of organic matter. Electrons and holes meet, recombine, and form excitons in the light-emitting layer. Excitons migrate under the action of an electric field, transfer energy to the light-emitting material, and excite electrons to transition from the ground state to the excited state. The excited state energy is deactivated by radiation to generate photons , releasing light energy. However, the luminous efficiency of organic electroluminescent devices is relatively low at present. Contents of the invention [0003]...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54H01L51/56
CPCH10K71/164H10K85/211H10K30/865H10K50/155H10K50/11H10K71/00
Inventor 周明杰王平黄辉陈吉星
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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