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Stable white-light LED based on silicon dioxide coated perovskite quantum dots, and preparation method thereof

A technology of silicon dioxide and perovskite, which is applied in the field of lighting, can solve the problems of poor stability of perovskite quantum dot white light LEDs, and achieve the effect of improving poor stability and high fluorescence quantum yield

Inactive Publication Date: 2016-10-12
JILIN UNIV
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Problems solved by technology

[0005] In order to solve the problem of poor stability of perovskite quantum dot white light LEDs in the prior art, the present invention proposes a method for preparing white light LEDs based on silica-coated perovskite quantum dot phosphor powder, which can effectively improve its stability

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  • Stable white-light LED based on silicon dioxide coated perovskite quantum dots, and preparation method thereof
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specific Embodiment

[0035] The present invention adopts green-light silicon dioxide-coated perovskite CsPbBr with luminous peak wavelengths at 522nm and 624nm respectively. 3 Quantum dot phosphor and red-emitting silica-coated perovskite CsPb(Br / I) 3 Quantum dot phosphor, the two are mixed as a fluorescent layer, and the blue LED chip is used as an excitation light source to obtain a stable white LED.

[0036] 1. The preparation scheme of white light LED based on silica-coated perovskite quantum dots is as follows

[0037] Chemical Materials: Cesium Carbonate (99.9%), Oleic Acid (90%, OA), 3-Aminopropyltriethoxysilane (98%, APTES), Octadecene (90%, ODE), PbBr 2 (99.0%), n-hexane (99.5%) and toluene (99.5%), polymethyl methacrylate (Poly(methyl methacrylate), PMMA).

[0038] The first step is to select the gallium nitride blue LED chip 4 and perform ultrasonic and ultraviolet treatment;

[0039] The second step is to prepare green-light silica-coated perovskite CsPbBr with a peak emission wavel...

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Abstract

The invention relates to a stable white-light LED based on silicon dioxide coated perovskite quantum dots, and a preparation method of the stable white-light LED. According to the stable white-light LED based on the silicon dioxide coated perovskite quantum dots, perovskite quantum dots are embedded in a silicon dioxide substrate and combined with a blue-light LED chip to emit white light, 3-aminopropyltriethoxysilane (APTES) is subjected to hydrolysis to form the silicon dioxide substrate, then the perovskite quantum dots are coated by silicon dioxide, stable perovskite quantum dots in the air are obtained, the prepared silicon dioxide coated perovskite red-light and green-light quantum dot fluorescent powder serves as a light emitting layer, the blue-light LED chip serves as an excitation light source, the white light is emitted by utilizing the three-primary-color matching of blue light, red light and green light, and the stable white-light LED based on the silicon dioxide coated perovskite quantum dots is obtained. The stable white-light LED proposes the idea of embedding the perovskite quantum dots into the silicon dioxide substrate formed by hydrolyzing the APTES, so that the obtained silicon dioxide coated perovskite quantum dots can maintain long-term stability in the air and have high fluorescent quantum yield.

Description

technical field [0001] The invention relates to the lighting field, and relates to the preparation of a novel quantum dot light-emitting diode, in particular to a stable white light LED based on silicon dioxide-coated perovskite quantum dots and a preparation method. Background technique [0002] In recent years, the light-emitting diode (Light-Emitting Diode, LED) light source has become a high-efficiency, long-life lighting device due to its advantages of using low-voltage power supply, strong applicability, and multi-color light emission, and has played an important role in the field of lighting. status. Among them, white light-emitting diodes have attracted much attention in the field of lighting because of their low power consumption, long life, fast response time, and compact size. In recent years, quantum dots (Quantum Dot, QD) have been introduced into white light-emitting diodes as a member of the phosphor family due to their excellent optical properties such as hi...

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Application Information

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IPC IPC(8): H01L33/48H01L33/50
CPCH01L33/48H01L33/502H01L2933/0033H01L2933/0041
Inventor 张宇陈真孙春于伟泳张铁强
Owner JILIN UNIV
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