Organic electroluminescence device and preparation method thereof

An electroluminescent device and a luminescent technology, which are applied in organic light-emitting devices, organic light-emitting device structures, organic semiconductor devices, etc., can solve problems such as poor film-forming properties of lithium fluoride, easy formation of electronic defects, and electronic quenching

Inactive Publication Date: 2015-05-27
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The electron injection layer of traditional organic electroluminescent devices generally uses lithium fluoride, but because the melting point of lithium fluoride is too high, a large current must be used for evaporation during evaporation, and the evaporation room of the organic evaporation room is too high , will damage other organic functional layers, and the film-forming property of lithium fluoride is poor, and it is easy to form electron defects, resulting in the quenching of electrons and reducing the recombination probability of electrons and holes

Method used

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  • Organic electroluminescence device and preparation method thereof
  • Organic electroluminescence device and preparation method thereof
  • Organic electroluminescence device and preparation method thereof

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preparation example Construction

[0036] The preparation method of the organic electroluminescence device 100 of an embodiment, it comprises the following steps:

[0037] Step S110 , sequentially forming a hole injection layer 20 , a hole transport layer 30 , a light emitting layer 40 , an electron transport layer 50 and an electron injection layer 60 on the surface of the anode 10 .

[0038] The anode 10 is indium tin oxide glass (ITO), fluorine-doped tin oxide glass (FTO), aluminum-doped zinc oxide glass (AZO) or indium-doped zinc oxide glass (IZO), preferably ITO, and the thickness of the anode 10 is 50 nm to 300 nm, preferably 120 nm.

[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 p...

Embodiment 1

[0056] The structure ITO / MoO prepared in this embodiment 3 / NPB / Alq 3 / Bphen / Rb 2 CO 3 :ZnO:PBD / CsF:Bphen / Ag organic electroluminescent device, in this embodiment and the following embodiments, " / " indicates a layer, and ":" indicates doping.

[0057] Magnetron sputtering anode on the glass substrate, the material is ITO, and then photolithography treatment, cut into the required size, followed by detergent, deionized water, acetone, ethanol, isopropanol ultrasonic 15min each, to remove the glass surface organic pollutants; after cleaning, carry out proper treatment on the conductive substrate: oxygen plasma treatment, the treatment time is 5min, the power is 30W; the thickness is 80nm, and the hole injection layer is evaporated, and the material is MoO 3 , with a thickness of 25nm; the vapor-deposited hole transport layer, the material is NPB, and the thickness is 55nm; the vapor-deposited light-emitting layer, the material is Alq 3 , with a thickness of 16nm; the vapor-d...

Embodiment 2

[0065] The structure prepared in this example is AZO / WO 3 / NPB / DCJTB / TAZ / RbCl:ZnO:Bphen / Cs 2 CO 3 : PBD / Al organic electroluminescence device.

[0066] Magnetron sputtering anode on the glass substrate, the material is AZO, and then photolithography treatment, cut into the required size, sequentially use detergent, deionized water, ultrasonic 15min, remove the organic pollutants on the glass surface; Hole injection layer: material is WO 3 , with a thickness of 40nm; evaporated hole transport layer: the material is NPB, with a thickness of 45nm; evaporated luminescent layer: the selected material is DCJTB, with a thickness of 8nm; evaporated electron transport layer, the material is TAZ, with a thickness of 65nm; The injection layer includes a ternary doped layer and a cesium salt doped layer. The ternary doped layer is deposited by electron beam evaporation. The material is RbCl:ZnO:Bphen, and the mass ratio of RbCl, ZnO to Bphen is 3:2:1, and the thickness It is 10nm; On ...

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Abstract

An organic electroluminescence device comprises an anode, a hole injection layer, a hole transport layer, a luminescent layer, an electron transport layer, an electron injection layer and a cathode which are stacked in sequence, wherein the electron injection layer consists of a ternary doped layer and a cesium salt doped layer; the ternary doped layer comprises a rubidium compound material, a zinc oxide material and an electron transport material I; the rubidium compound material is at least one of rubidium carbonate, rubidium chloride, rubidium nitrate and rubidium sulfate; the glass transition temperature of the electron transport material I is 50-100 DEG C; the cesium salt doped layer comprises a cesium salt material and an electron transport material II doped in the cesium salt material; the glass transition temperature of the electron transport material II is 50-100 DEG C; the cesium salt material is at least one of cesium fluoride, cesium carbonate, cesium azide and cesium chloride. The organic electroluminescence device is relatively high in luminescence efficiency. The invention further provides a preparation method of the organic electroluminescence 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. [0003] The electron injection layer of traditional organic electroluminescent devices generally uses lithium fluoride, but because the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/54H01L51/56
CPCH10K50/171H10K2102/00H10K2102/302H10K71/00
Inventor 周明杰黄辉张振华王平
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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