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White-light luminescent part and preparation method thereof and white-light electroluminescent device

A technology for a light-emitting component and a blue light-emitting layer, which is applied in the field of white light-emitting components, their preparation, and white-light electroluminescent devices, can solve the problems of large energy loss, unstable luminescence, influence on the light-emitting of white-light electroluminescent devices, and the like, so as to avoid energy consumption. loss, improvement of luminous efficiency, and the effect of being suitable for industrial production

Active Publication Date: 2015-06-03
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the wide energy gap of blue phosphorescent materials, the main luminescence mechanism is that excitons are first formed in the host material, and then transferred to the guest material through energy transfer to emit light. During the energy transfer process, the energy loss is relatively large; in general, With the increase of device voltage, there is a phenomenon of unstable luminescence in red light emission and green light emission, which affects the overall light emission of white light electroluminescent devices.

Method used

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  • White-light luminescent part and preparation method thereof and white-light electroluminescent device
  • White-light luminescent part and preparation method thereof and white-light electroluminescent device
  • White-light luminescent part and preparation method thereof and white-light electroluminescent device

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preparation example Construction

[0039] The embodiment of the present invention further provides the method for preparing the above-mentioned white light emitting component, including the following steps:

[0040] mixing a blue phosphorescent material and a hole transport material with an energy gap above 3.5 eV to obtain a first mixture, and evaporating, spin coating or sputtering the first mixture to form a first blue light emitting layer;

[0041] Mixing the red phosphorescent material, the blue phosphorescent material, the hole transport layer, and the electron transport layer to obtain a second mixture, and vapor-depositing, spin-coating or sputtering the second mixture on the first blue light-emitting layer to form a red light emitting layer. Mixed light-emitting layer with green light;

[0042] Mixing a blue phosphorescent material and a hole transport material with an energy gap above 3.5 eV to obtain a third mixture, and vapor-depositing, spin-coating or sputtering the third mixture on the red and gr...

Embodiment 1

[0048] Evaporate and form molybdenum trioxide hole injection layer on ITO glass;

[0049] Evaporating and forming a hole transport layer of NPB on the hole injection layer;

[0050] Evaporating and forming a TPD electron blocking layer on the hole transport layer;

[0051] Preparation of the first blue light-emitting structure:

[0052] Mixing Fir6 and UGH2 to obtain the first mixture, wherein the mass percentage of Fir6 is 5%, the first mixture is evaporated on the electron blocking layer to form the first blue light-emitting layer, and the thickness of the first blue light-emitting layer is 10nm;

[0053] Preparation of red and green mixed light-emitting layer:

[0054] Ir(MDQ) 2 (acac), Ir(ppy) 3 , TCTA and TPBi are mixed, wherein, the weight percentage of Firpic is 1%, Ir(ppy) 3 The weight percentage composition of 5%, the mass ratio of TCTA and TPBi is 1: 3, obtains the second mixture;

[0055] Preparation of the second blue light-emitting structure:

[0056] Mix ...

Embodiment 2

[0063] The preparation method of the white photoluminescent device of this embodiment is according to Embodiment 1, wherein, in the first mixture and the third mixture, the mass percentage of Fir6 is 1%, and in the second mixture, Ir(MDQ) 2 The mass percentage of (acac) is 0.5%, Ir(ppy) 3 The mass percentage content is 7%.

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Abstract

The invention is applicable to the technical field of electroluminescence, and provides a white-light luminescent part and a preparation method thereof and a white-light electroluminescent device. The white-light luminescent part comprises a first blue-light luminescent layer, a second blue-light luminescent layer and a red-light and green-light mixed luminescent layer between the first blue-light luminescent layer and the second blue-light luminescent layer, wherein the three luminescent layers are stacked, and the first blue-light luminescent layer and the second blue-light luminescent layer are made of mixture of blue-light phosphorescent materials and hole transmission materials with the energy gap higher than 3.5ev. By means of the hole transmission materials with the ultra-wide energy gaps, energy loss during energy transmission is avoided, and luminescence efficiency is greatly improved; the first blue-light luminescent layer and the second blue-light luminescent layer form a quantum trap structure, and luminescence of the red-light and green-light mixed luminescent layer can be stabilized; and the preparation method is simple in operation, low in cost, high in production effectiveness and extremely suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of electroluminescence, and in particular relates to a white light emitting component, a preparation method thereof and a white light electroluminescence device. Background technique [0002] White photoluminescent devices are composed of blue light emitting, red light emitting and green light emitting, and blue phosphorescent materials are commonly used luminescent materials in the light emitting structure of white photoluminescent devices. Due to the wide energy gap of blue phosphorescent materials, the main luminescence mechanism is that excitons are first formed in the host material, and then transferred to the guest material through energy transfer to emit light. During the energy transfer process, the energy loss is relatively large; in general, As the voltage of the device increases, there is a phenomenon of unstable luminescence in red light emission and green light emission, which affects the overal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54H01L51/56C09K11/06
CPCY02B20/00
Inventor 周明杰王平黄辉钟铁涛
Owner OCEANS KING LIGHTING SCI&TECH CO LTD