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Organic electroluminescent device and preparation method thereof

An electroluminescence device and electroluminescence technology, which are applied in the fields of electric solid state devices, semiconductor/solid state device manufacturing, electrical components, etc., and can solve the problems of low luminous efficiency, damage to organic layers, and easy quenching.

Inactive Publication Date: 2015-05-20
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 cathode of traditional organic electroluminescent devices is generally made of silver (Ag), gold (Au) and other metals. After preparation, the cathode is very easy to penetrate into the organic layer, causing damage to the organic layer, and the electrons are easily quenched near the cathode, so that the luminous efficiency lower

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

[0034] The preparation method of the organic electroluminescence device 100 of an embodiment, it comprises the following steps:

[0035] 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 .

[0036] 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.

[0037] 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 .

[0038] The hole injection la...

Embodiment 1

[0052] The structure prepared in this example is ITO / MoO 3 / NPB / Alq 3 / Bphen / LiF / NaF / F4-TCNQ:TiO 2 / Mg:SiO 2 In this embodiment and the following embodiments, " / " indicates a layer, and ":" indicates doping.

[0053] 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 Appropriate treatment: oxygen plasma treatment, the treatment time is 5min, the power is 30W; the hole injection layer is evaporated, and the material is MoO 3 , with a thickness of 60nm; evaporated hole transport layer, made of NPB, with a thickness of 50nm; evaporated luminescent layer, made of BCzVBi, with a thickness of 30nm; evaporated electron transport layer, made of Bphen, with a thickness of 160nm; evaporated electron The injection layer is made of LiF with a thickness of 0.7nm; the e...

Embodiment 2

[0060] The structure prepared in this example is AZO / MoO 3 / TCTA / ADN / Bphen / CsF / Na 2 CO 3 / 1T-NATA:TiO 2 / Sr:Al 2 o 3 organic electroluminescent devices.

[0061] First, use detergent, deionized water, and ultrasonication on the AZO glass substrate for 15 minutes to remove organic pollutants on the glass surface; evaporate the hole injection layer: the material is MoO 3 , with a thickness of 80nm; evaporated hole transport layer: the material is TCTA, with a thickness of 60nm; evaporated luminescent layer: the selected material is ADN, with a thickness of 5nm; evaporated electron transport layer, the material is Bphen, with a thickness of 200nm; evaporated The electron injection layer is plated, the material is CsF, and the thickness is 10nm; the evaporation cathode is evaporated on the surface of the electron injection layer by thermal resistance evaporation to prepare a sodium salt layer, and the material is Na 2 CO 3 , with a thickness of 5nm, and then prepare a hole ...

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Abstract

An organic electroluminescent device comprises an anode, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and a cathode, all of which are sequentially stacked. The cathode layer is composed of a sodium salt layer, a hole injection material doped layer, and a metal doped layer. The sodium salt layer includes at least one material selected from sodium carbonate, sodium fluoride, sodium chloride, and sodium bromide. The hole injection material doped layer includes a hole injection material and titanium dioxide doped in the hole injection material, wherein the hole injection material includes at least one selected from 2, 3, 5, 6-polytetrafluoroethylene-7, 7, 8, 8-tetracyanoquinodimethane, 4, 4, 4-tri(naphthyl-1-phenyl-ammonium)triphenylamine, and dinaphthyl-N, N'-diphenyl-4, 4'-benzidine. The organic electroluminescent device has high luminous efficiency. The invention further provides a method for preparing 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. [0003] The cathodes of traditional organic electroluminescent devices are generally silver (Ag), gold (Au) and other metals. After prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/52H01L51/54H01L51/56
CPCH10K50/826H10K71/00
Inventor 周明杰黄辉张娟娟王平
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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