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Organic electroluminescence device and preparation method thereof

An electroluminescence 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, so as to improve light-extraction efficiency, Effect of improving stability and lowering potential barrier

Inactive Publication Date: 2015-05-27
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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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

Examples

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preparation example Construction

[0038] The preparation method of the organic electroluminescent device 100 according to 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 composed of a lithium salt material layer 201, a metal doped layer 202 and an iron salt material doped layer 203. The lithium salt material layer 201 is prepared on the surface of the glass substrate 10 by thermal resistance evaporation. The material of 201 is selected from lithium oxide (Li 2 At least one of lithium fluoride (LiF), lithium chloride (LiCl) and lithium bromide (LiBr), the metal doped layer 202 is prepared on the surface of the lithium salt material layer 201 by thermal resistance evaporation, so The metal doped layer 202 includes a first metal material and the luminescent material doped in the first metal material, the work function of the first metal material is -2...

Embodiment 1

[0061] The structure prepared in this example is glass substrate / LiCl / Ca:Alq 3 / FeCl 3 :Ag / ITO / MoO 3 / NPB / Alq 3 / TAZ / CsF / Ag organic electroluminescent device, in this embodiment and the following embodiments, " / " indicates a layer, and ":" indicates doping.

[0062] The glass substrate is N-LASF44. After rinsing the glass substrate with distilled water and ethanol, soak it in isopropanol for one night. Prepare the scattering layer on the glass substrate. The scattering layer is composed of lithium salt material layer, metal doped layer and iron salt material doped layer. The lithium salt material layer is prepared by thermal resistance evaporation on the surface of the glass substrate. The material is LiCl, and the thickness is 8nm, the metal doped layer is prepared by thermal resistance evaporation on the surface of the lithium salt material layer, and the material is Ca:Alq 3 , Ca and Alq 3 The mass ratio is 6:1, the thickness is 200nm, and the iron salt material doped ...

Embodiment 2

[0070] The structure prepared in this example is a glass substrate / Li 2 O / Mg:DCJTB / FeBr 3 :Al / IZO / MoO 3 / NPB / DCJTB / TPBi / Cs 2 CO 3 / Al organic electroluminescent devices.

[0071] The glass substrate is N-LAF36. After rinsing the glass substrate with distilled water and ethanol, soak it in isopropanol for one night to prepare a scattering layer on the glass substrate. The scattering layer is composed of lithium salt material layer, metal doped layer and iron salt Material doped layer composition, the lithium salt material layer is prepared by thermal resistance evaporation on the surface of the glass substrate, the material is Li 2 O, the thickness is 10nm, the metal-doped layer is prepared by thermal resistance evaporation on the surface of the lithium salt material layer, the material is Mg:DCJTB, the mass ratio of Mg and DCJTB is 1:1, the thickness is 300nm, on the surface of the metal-doped layer Electron beam evaporation is used to prepare the doped layer of iron salt...

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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 lithium salt material layer, a metal doped layer and a ferric salt material doped layer; the lithium salt material layer is selected from at least one of lithium oxide, lithium fluoride, lithium chloride and lithium bromide; the metal doped layer comprises a first metal material and a light emitting material doped in the first metal material; the power function of the first metal material is minus 2.0-minus 3.5eV; the ferric salt material doped layer comprises a ferric salt material and a second metal material doped in the ferric salt material; the ferric salt material is selected from at least one of ferric chloride, ferric bromide and ferric sulfide; the power function of the second metal material is minus 4.0-minus 5.5eV. The invention further provides a preparation method of the organic electroluminescence device.

Description

technical field [0001] The present invention relates to an organic electroluminescence device and a preparation method thereof. Background technique [0002] The light-emitting principle of organic electroluminescence devices is based on the fact that under the action of an external electric field, electrons are injected from the cathode to the lowest unoccupied molecular orbital (LUMO) of organic matter, while 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. The excitons migrate under the action of the electric field, transfer energy to the light-emitting material, and excite the electrons to transition from the ground state to the excited state. The energy of the excited state is deactivated by radiation to generate photons. , releasing light energy. [0003] In traditional light-emitting devices, only about 18% of the light inside the d...

Claims

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Application Information

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IPC IPC(8): H01L51/52H01L51/54H01L51/56
Inventor 周明杰黄辉陈吉星王平
Owner OCEANS KING LIGHTING SCI&TECH CO LTD