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Organic electroluminescence device and preparation method thereof

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 poor refractive index, total reflection loss, and low light extraction performance

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] In traditional light-emitting devices, only about 18% of the light inside the device can be emitted to the outside, while the rest will be consumed outside the device in other forms, and there is a difference in refractive index between the interfaces (such as between glass and ITO). The difference between the refractive index, the refractive index of glass is 1.5, ITO is 1.8, the light from ITO reaches the glass, and total reflection will occur), which causes the loss of total reflection, resulting in lower overall light extraction performance

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

[0038] The manufacturing method of the organic electroluminescent device 100 of an embodiment includes the following steps:

[0039] In step S110, the scattering layer 20 is prepared by electron beam evaporation on the surface of the glass substrate 10.

[0040] The scattering layer 20 is formed on one side surface of the glass substrate 10. The scattering layer 20 is composed of a metal material doped layer 201 and a calcium compound material doped layer 202. The metal material doped layer 201 is prepared on the bottom surface of the glass substrate 10 by thermal resistance evaporation. The metal material doped layer 201 It includes a metal material and a light-emitting material doped in the metal material, the work function of the metal material is -4.0eV~-5.5eV, and the light-emitting material is selected from 4-(dinitrile methyl)-2-butane Base-6-(1,1,7,7-tetramethyljulonidine-9-vinyl)-4H-pyran (DCJTB), 9,10-di-β-naphthyleneanthracene (ADN) , 4,4'-bis(9-ethyl-3-carbazole vinyl...

Embodiment 1

[0061] The structure prepared in this embodiment is a glass substrate / Au:Alq 3 / CaF 2 :MgO / ITO / MoO 3 / NPB / Alq 3 / TAZ / CsF / Ag organic electroluminescence device. In this embodiment and the following embodiments, " / " means layer, and ":" means doping.

[0062] The glass substrate is N-LASF44. Rinse the glass substrate with distilled water and ethanol, and soak it in isopropanol overnight. A scattering layer is prepared on a glass substrate. The scattering layer is composed of a metal material doped layer and a calcium compound material doped layer. The metal material doped layer is prepared by thermal resistance evaporation on the surface of the glass substrate. The material is Au:Alq 3 , Au and Alq 3 The mass ratio is 3.5:1 and the thickness is 35nm. Electron beam evaporation is used to prepare a calcium compound material doped layer on the surface of the metal material doped layer. The material is CaF 2 :MgO, CaF 2 The ratio of mass to MgO is 7:1, the thickness is 80nm, the energy d...

Embodiment 2

[0070] The structure prepared in this embodiment is a glass substrate / Al:ADN / CaCl 2 :MgS / IZO / MoO 3 / TAPC / ADN / TPBi / Cs 2 CO 3 / Al organic electroluminescent device.

[0071] The glass substrate is N-LAF36. After the glass substrate is rinsed with distilled water and ethanol, it is soaked in isopropanol for one night to prepare a scattering layer on the glass substrate. The scattering layer is doped with a metal material doped layer and a calcium compound material. Layer composition, the metal material doped layer is prepared by thermal resistance evaporation on the surface of the glass substrate, the material is Al:ADN, the mass ratio of Al to ADN is 4:1, the thickness is 10nm, and the electron beam is used on the surface of the metal material doped layer Preparation of doped layer of calcium compound material by evaporation, the material is CaCl 2 :MgS, CaCl 2 The ratio of mass to MgS is 15:1, the thickness is 100nm, and the energy density of electron beam evaporation is 10W / cm 2 ....

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Abstract

The invention discloses an organic electroluminescence device which comprises a glass substrate, a scattering layer, an anode, a hole injection layer, a hole transmission layer, a light emitting layer, an electron transfer layer, an electron injection layer and a cathode which are overlapped in sequence, wherein the scattering layer consists of a metal material doped layer and a calcium compound material doped layer; the metal material doped layer comprises a metal material and a light emitting material doped in the metal material; the power function of the metal material is minus 4.0-minus 5.5eV; the calcium compound material doped layer comprises a calcium compound material and a magnesium compound material doped in the calcium compound material; the calcium compound material is selected from at least one of calcium oxide, calcium chloride, calcium carbonate and calcium fluoride; the magnesium compound material is selected from at least one of magnesium fluoride, magnesium oxide, magnesium chloride and magnesium sulfide. The organic electroluminescence device disclosed by the invention is relatively high in light emission 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 light-emitting principle of organic electroluminescent devices is based on the fact that electrons are injected from the cathode to the lowest unoccupied molecular orbital (LUMO) of organic matter under the action of an external electric field, and holes are injected from the anode to the highest occupied orbital (HOMO) of organic matter. Electrons and holes meet and recombine in the light-emitting layer to form excitons. The excitons migrate under the action of an electric field, transfer energy to the luminescent material, and excite the electrons to transition from the ground state to the excited state. The excited state energy is deactivated by radiation to produce photons , Release light energy. [0003] In traditional light-emitting devices, only about 18% of the light inside the device can be emitted to the outside, while ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/52H01L51/54H01L51/56
CPCH10K50/00H10K50/854H10K71/00
Inventor 周明杰黄辉陈吉星王平
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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