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A single-component electroluminescent white light device and its preparation method

A white light device, single-component technology, applied in the direction of electric solid device, semiconductor/solid state device manufacturing, electrical components, etc., can solve the problems of limited development, spectral drift, complex preparation process, etc. The effect of process compatibility and simple device structure

Active Publication Date: 2020-01-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Usually, in order to achieve white light, the light-emitting layer is composed of two or more light-emitting materials of complementary colors, but its preparation process is complex, usually requiring multi-layer transmission layers and barrier layers, and adding between different light-emitting centers to block energy Transferred Insertion Layer
In addition, the shortage and relatively low efficiency of blue light materials required to prepare white light, coupled with the generally low lifetime of these materials, limit its further development
[0004] In addition, multiple luminescence centers lead to the luminescence spectrum is easily affected by external conditions such as voltage, and it is easy to cause spectral drift after long-term use, which restricts its stability to a certain extent.

Method used

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  • A single-component electroluminescent white light device and its preparation method
  • A single-component electroluminescent white light device and its preparation method
  • A single-component electroluminescent white light device and its preparation method

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preparation example Construction

[0038] The method for preparing the above-mentioned electroluminescent device comprises the following steps:

[0039] 1) Using deionized water, acetone, isopropanol and ethanol successively as cleaning agents, cleaning the substrate under ultrasonic conditions, drying or drying after cleaning. sequentially depositing a first transport layer, a luminescent active layer and a second transport layer on the cleaned substrate;

[0040] 2) Transfer the substrate with the prepared second transport layer into the vacuum chamber, and pump the vacuum to 5╳10 -4 Below Pa, metal electrodes or composite electrodes are vapor-deposited on it; or liquid electrodes are directly applied, and the liquid electrodes are applied on the second transmission layer, and the electroluminescent device is obtained after completion.

[0041] Wherein, the preparation method of the luminescent active layer comprises the following steps:

[0042] (a) Place the thin film transfer of the prepared first transp...

Embodiment 1

[0068] The preparation method of the electroluminescent white light device in this embodiment, its specific preparation steps are as follows:

[0069] a) Clean the 1.7cm by 1.7cm indium tin oxide (ITO) substrate with deionized water for 5 to 20 minutes, clean the indium tin oxide (ITO) substrate with acetone for 20 minutes, and clean the indium tin oxide (ITO) substrate with isopropanol for 20 minutes , wash the indium tin oxide (ITO) substrate with deionized water for 20 min, and then dry it with a nitrogen gun.

[0070] b) Spin-coating of zinc oxide (ZnO) nanoparticles for the first transport layer

[0071] (1) Dissolve 3mmol of zinc acetate dihydrate in 30ml of dimethyl sulfoxide (DMSO), 5.5mmol of tetramethylammonium hydroxide (TMAH) in 10ml of ethanol, and add dropwise to the above DMSO solution after completely dissolving , heated in a water bath at 30°C for 1h.

[0072] (2) Divide the solution (40ml in total) into four centrifuge tubes, each with 10ml. For the first ...

Embodiment 2

[0090] The preparation method of the electroluminescent white light device in this embodiment, its specific preparation steps are as follows:

[0091] a) Wash the 1.7cm by 1.7cm indium tin oxide (ITO) substrate with deionized water for 20 minutes, clean the indium tin oxide (ITO) substrate with acetone for 20 minutes, clean the indium tin oxide (ITO) substrate with isopropanol for 20 minutes, and use The indium tin oxide (ITO) substrate was cleaned with deionized water for 20 minutes, and then dried with a nitrogen gun.

[0092] b) Spin-coating of zinc oxide (ZnO) nanoparticles for the first transport layer

[0093] (1) Dissolve 3mmol of zinc acetate dihydrate in 30ml of dimethyl sulfoxide (DMSO), 5.5mmol of tetramethylammonium hydroxide (TMAH) in 10ml of ethanol, and add dropwise to the above DMSO solution after completely dissolving , heated in a water bath at 30°C for 1h.

[0094] (2) Divide the solution (40ml in total) into four centrifuge tubes, each with 10ml. For the...

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Abstract

The invention discloses a single-component electroluminescent device and a preparation method thereof. The device uses a single-component perovskite material as a light-emitting active layer, injects carriers through the transport layer, and generates limited Exciton state luminescence, its electroluminescence spectrum can cover the entire visible light region. The present invention enters the field of electroluminescent white light by introducing a new mechanism. Compared with the prior art, the preparation process is simple, only one light-emitting layer is needed to realize wide-spectrum white light, and it can effectively solve the problem of unstable spectrum of existing electroluminescent white light. question.

Description

technical field [0001] The invention belongs to the field of electroluminescent devices, and more specifically relates to a single-component electroluminescent device and a preparation method thereof. Background technique [0002] Electroluminescence device is a new type of display technology, which can be widely used in flat panel display, solid-state lighting, flexible lighting display and other fields. , has received extensive attention, has a broad market space and huge application prospects. [0003] Usually, in order to achieve white light, the light-emitting layer is composed of two or more light-emitting materials of complementary colors, but its preparation process is complex, usually requiring multi-layer transmission layers and barrier layers, and adding between different light-emitting centers to block energy Transferred insert layer. In addition, the shortage and relatively low efficiency of blue light materials required to prepare white light, coupled with th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/52H01L51/56
CPCH10K50/805H10K2102/00H10K50/11H10K71/00
Inventor 唐江罗家俊牛广达李顺然刘婧张成
Owner HUAZHONG UNIV OF SCI & TECH
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