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Organic electroluminescent device and method for preparing same

An electroluminescent device and luminescence technology, which is applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of low luminous efficiency, organic layer damage, easy quenching, etc.

Inactive Publication Date: 2015-04-15
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 method for preparing same
  • Organic electroluminescent device and method for preparing same
  • Organic electroluminescent device and method for preparing same

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 / MoO 3 :CdS / TAZ:Ag / ZnS:TiO 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 / WO 3 :ZnS / OXD-7:Al / CdS:TiO 2 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 cathode is evaporated, and the metal oxide doped layer is prepared by evaporation on the surface of the electron injection layer by thermal resistance evaporation, and the material is WO 3 : ZnS, WO 3 The mass ratio of ZnS and ZnS is 1:1, a...

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Abstract

Provided is an organic electroluminescent device, comprising an anode, a hole injection layer, a hole transport layer, a luminous layer, an electron transfer layer, an electron injection layer, and a cathode stacked in sequence. The cathode layer is formed by a metallic oxide doping layer, an organic electron transport material doping layer, and a metal sulfide doping layer. The metallic oxide doping layer contains metallic oxides and metal sulfides doped in the metallic oxides. The metal sulfides are selected from at least one of zinc sulfide, cadmium sulfide, magnesium sulfide, and copper sulphide. The organic electron transport material doping layer contains an organic electron transport material and metal doped in the organic electron transport material. The metal sulfide doping layer contains metal sulfides and titanium dioxide doped in the metal sulfides. The metal sulfides are selected from at least one of zinc sulfide, cadmium sulfide, magnesium sulfide, and copper sulphide. The luminescence efficiency of the organic electroluminescent device is high. The invention also 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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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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