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Organic electroluminescence device and preparation method thereof

An electroluminescent device and a luminescent technology, which are applied in the fields of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, 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

AI Technical Summary

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

Examples

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preparation example Construction

[0035] The preparation method of the organic electroluminescence device 100 of an embodiment, it comprises the following steps:

[0036] 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 .

[0037] 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.

[0038]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 po...

Embodiment 1

[0054] The structure prepared in this example is ITO / MoO 3 / TCTA / Alq 3 / Bphen / Rb 2 CO 3 :CuPc:Ag / Ag organic electroluminescent device, in this embodiment and the following embodiments, " / " indicates a layer, and ":" indicates doping.

[0055] 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; clean the conductive substrate Proper treatment: oxygen plasma treatment, treatment time is 5min, power is 30W; thickness is 130nm, hole injection layer is evaporated, material is MoO 3 , with a thickness of 40nm; the vapor-deposited hole transport layer, the material is TCTA, and the thickness is 25nm; the vapor-deposited light-emitting layer, the material is Alq 3 , with a thickness of 14nm; the vapor-deposited electron transport layer, the material is Bphen, and the thickness is 80nm; the electr...

Embodiment 2

[0062] The structure prepared in this example is AZO / V 2 o 5 / TAPC / DCJTB / TAZ / RbCl:CuI:Al / Al organic electroluminescence device.

[0063]First, use detergent, deionized water, and ultrasound on the AZO glass substrate for 15 minutes to remove organic pollutants on the glass surface; evaporate the hole injection layer: the material is V 2 o 5 , with a thickness of 40nm; evaporated hole transport layer: the material is TAPC, 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; Electron beam evaporation electron injection layer, the material is RbCl:CuI:Al, RbCl, the mass ratio between CuI and Al is 2:0.1:1, the thickness is 60nm, the material is Al, and the thickness is 80nm.

[0064] The specific process conditions of the electron beam evaporation method are: the working pressure is 2×10 -3 Pa, the energy density of electron beam eva...

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Abstract

An organic electroluminescence device comprises an anode, a hole injection layer, a hole transporting layer, a luminous layer, an electron transporting layer, an electron injection layer and a cathode which are overlapped in sequence, wherein the electron injection layer is made of one or more rubidium compound materials, one or more copper oxide materials and one or more of metal materials; the rubidium compound material(s) is / are one or more of rubidium carbonate, rubidium chloride, rubidium nitrate and rubidium sulfate; the copper oxide material(s) is / are one or more of cuprous iodide, cuprous oxide, copper phthalocyanine and cupric oxide; the work function of the metal materials is -4.0 eV to -5.5 eV. The light efficiency of the organic electroluminescence device is relatively high. 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): H01L51/52H01L51/54H01L51/56
CPCH10K50/171H10K71/00
Inventor 周明杰黄辉张振华王平
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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