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Organic light emitting device and preparation method thereof

An electroluminescent device and electroluminescent technology, which can be applied in the fields of electro-solid devices, semiconductor/solid-state device manufacturing, electrical components, etc., and can solve problems such as low luminous efficiency

Inactive Publication Date: 2014-09-10
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

Existing organic electroluminescent devices have low luminous efficiency

Method used

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  • Organic light emitting device and preparation method thereof
  • Organic light emitting device and preparation method thereof
  • Organic light emitting device and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0031] Please also see figure 2 , the preparation method of the organic electroluminescent device 100 of an embodiment, it comprises the following steps:

[0032] Step S110, coating an aqueous solution containing poly-3,4-dioxyethylenethiophene, polybenzenesulfonate, and graphene coated with calcium oxide on the surface of the anode 30, and forming a hole injection layer on the surface of the anode 30 after drying 40.

[0033] The material of the anode 30 is indium tin oxide glass (ITO), aluminum zinc oxide glass (AZO) or indium zinc oxide glass (IZO), preferably ITO.

[0034] In this embodiment, before the hole injection layer 40 is formed on the surface of the anode 30, photolithography treatment is carried out, and the size is cut into the required size, and then ultrasonicated for 15 minutes with detergent, deionized water, acetone, ethanol, and isopropanol. Remove organic pollutants from glass surfaces.

[0035] In this embodiment, the hole injection layer has a thick...

Embodiment 1

[0049] In this example, an organic electroluminescent device with a structure of ITO glass / calcium oxide graphene: PEDOT:PSS / NPB / ADN / TAZ / CsF / Ag was prepared.

[0050] Firstly, the ITO glass substrate was washed with detergent, deionized water, and ultrasonic for 15 minutes to remove organic pollutants on the glass surface; the surface of the ITO glass substrate was spin-coated with PEDOT, PSS and graphene coated with calcium oxide on the surface (in this paper Indicates coating, such as calcium oxide graphene indicates graphene coated with calcium oxide on the surface; ":" indicates a mixture, calcium oxide graphene: PEDOT:PSS indicates a mixture of PEDOT, PSS and graphene coated with calcium oxide on the surface ) aqueous solution to prepare the hole injection layer, the mass ratio of PEDOT and PSS is 4:1, the mass ratio of PEDOT and water is 3.5:100, and the mass ratio of graphene coated with calcium oxide on the surface and PEDOT is 1:20, The mass ratio of calcium oxide to ...

Embodiment 2

[0055] The structure prepared in this example is AZO glass / calcium oxide graphene: PEDOT:PSS / TCTA / Alq 3 / Bphen / Cs 2 CO 3 / Al organic electroluminescent devices.

[0056] First, the AZO glass substrate is sequentially washed with detergent, deionized water, and ultrasonic for 15 minutes to remove organic pollutants on the glass surface; the surface of the AZO glass substrate is spin-coated with an aqueous solution containing PEDOT, PSS, and graphene coated with calcium oxide on the surface. Hole injection layer, the mass ratio of PEDOT and PSS is 2:1, the mass ratio of PEDOT and water is 1:100, the mass ratio of graphene coated with calcium oxide on the surface and PEDOT is 1:100, the mass ratio of calcium oxide and graphite The mass ratio of alkene is 1:5, wherein the graphene coated with calcium oxide on the surface has the following steps to prepare, the calcium chloride solution with a mass concentration of 30% is mixed with graphene, the quality of graphene and calcium c...

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Abstract

An organic light emitting 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 which are sequentially stacked. The materials of the hole injection layer include poly(3,4-ethoxylene dioxy thiophene), polystyrene sulfonate, and grapheme coated with calcium oxide, wherein the mass ratio of polystyrene sulfonate to poly(3,4-ethoxylene dioxy thiophene) is 1:2 to 1:6, and the mass ratio of grapheme coated with calcium oxide to poly(3,4-ethoxylene dioxy thiophene) is 1:100 to 1:10. The light emitting efficiency of the organic light emitting device is high. The invention further provides a preparation method of the organic light emitting 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. The luminous efficiency of existing organic electroluminescent devices is relatively low. Contents of the invention [0003] Based on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/52H01L51/54H01L51/56
CPCH10K71/10H10K85/211H10K85/6576H10K85/324H10K50/17
Inventor 周明杰王平黄辉陈吉星
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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