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Halide nanocrystalline dispersion glass and application thereof

A technology of nanocrystals and halides, applied in nanotechnology, nanotechnology, nanotechnology for information processing, etc., can solve problems such as difficulty in preparing photoelectric functional devices, reducing the overall efficiency of photoelectric devices, and difficult to achieve effective absorption of light sources. Achieve the effect of improving the overall optical efficiency, high practical value, and reducing weight

Active Publication Date: 2022-03-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the preparation process of cesium lead halide perovskite nanocrystalline dispersed glass is mature, it is usually prepared by melting-forming-heat treatment. The formed cesium lead halide perovskite nanocrystals are randomly distributed in the glass matrix, making it difficult to prepare photoelectric functional devices.
The cesium lead halide perovskite nanocrystalline dispersed glass prepared by the above method usually has a low density of cesium lead halide perovskite nanocrystals formed in the glass, which makes it difficult to achieve effective absorption of specific light sources and easily leads to serious self-absorption Phenomenon, reduce the overall efficiency of optoelectronic devices

Method used

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  • Halide nanocrystalline dispersion glass and application thereof
  • Halide nanocrystalline dispersion glass and application thereof
  • Halide nanocrystalline dispersion glass and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Weigh raw materials according to the following mole percentage composition: SiO 2 :35%, B 2 o 3 : 35%, ZnO: 5%, CaO: 5%, PbO: 2%, Na 2 O: 3%, KBr: 15%. After mixing evenly, melt it at 1230°C for 20 minutes, then cool it rapidly and anneal it to obtain completely transparent glass. After cutting and polishing the original glass, CsNO at 480-510°C 3 Ion exchange in molten salt to obtain CsPbBr 3 Nanocrystalline dispersed transparent glass.

[0070] figure 1 are the absorption spectra of AP and ion-exchanged glass samples. From figure 1 It can be seen that as the ion exchange temperature increases or the time prolongs, the position of the absorption peak shoulder in the spectrum gradually moves from 481nm to 505nm; it shows that after ion exchange, CsPbBr is formed in the glass 3 nanocrystals, and the nanocrystals gradually become larger. figure 1 Under the excitation of 360nm light in the medium glass sample, visible light luminescence was observed in both the A...

Embodiment 2

[0075] The present embodiment glass composition (mol percentage) is SiO 2 :35%, B 2 o 3 : 35%, ZnO: 5%, CaO: 5%, PbO: 2%, Na 2 O: 3%, KCl: 3.75%, KBr: 11.25%. Glass preparation and ion exchange methods and conditions are the same as in Example 1. The difference between this example and Example 1 is that KCl is introduced into the glass composition, and the content ratio of KCl to KBr is 1:3. Figure 7 and Figure 8 For this embodiment sample in CsNO 3 Absorption spectra of glass samples obtained after ion exchange in molten salt. With the increase of ion-exchange temperature, the absorption shoulder of ion-exchange samples gradually red-shifted from 488nm to 501nm ( Figure 7 ), the luminescence peak red shifted from 488nm to 508nm ( Figure 8 ).

Embodiment 3

[0077] The present embodiment glass composition (mol percentage) is SiO 2 :35%, B 2 o 3 : 35%, ZnO: 5%, CaO: 5%, PbO: 2%, Na 2 O: 3%, KCl: 7.5%, KBr: 7.5%. The difference between this embodiment and embodiment 2 is that the content ratio of KCl and KBr is 1:1. The absorption shoulders of ion-exchanged glass samples are located at 467nm (480°C / 10h, the ion exchange temperature and time in brackets, the same below), 472nm (500°C / 5h), 474nm (500°C / 10h), 475nm (500°C / 15h), 480nm (510°C / 10h), the corresponding luminescence peaks of the samples are located at 481nm (480°C / 10h), 484nm (500°C / 5h), 486nm (500°C / 10h), 487nm (500°C / 15h) and 489nm (510°C / 10h).

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Abstract

The invention relates to halide nanocrystalline dispersion glass and application thereof. The surface layer of the dispersion glass is a Cs ion exchange layer, the halide nanocrystals are distributed in the Cs ion exchange layer, the halide nanocrystals comprise one or a combination of more than two of CsPbX3, Cs4PbX6, CsX and KX, and X is one or a combination of more than two of Cl, Br and I. The invention further discloses a preparation method of the dispersion glass. According to the invention, controllable preparation of halide nanocrystals and cesium-lead halide perovskite nanocrystals is realized in a certain depth range of the surface layer of the glass by adopting cation exchange, and controllable preparation of various cesium-lead halide perovskite nanocrystals and halide nanocrystals in the surface layer of the glass can be realized by combining glass composition design and cation exchange process adjustment. The cesium-lead halide perovskite nanocrystalline dispersion glass provided by the invention can be used for preparing cesium-lead halide perovskite nanocrystalline with controllable depth range, controllable crystal types and adjustable absorption and light-emitting wave bands in the surface layer of the glass, and has application value in the fields of illumination, backlight sources, information display and the like.

Description

technical field [0001] The invention belongs to the field of nanocrystalline materials and preparation methods thereof, in particular to a halide nanocrystalline dispersed glass and its application. Background technique [0002] Halide nanocrystals, especially cesium lead halide perovskite nanocrystals are an important class of luminescent materials, which have important application value in lighting, backlight, information display and other fields. However, the poor stability of cesium lead halide perovskite nanocrystals restricts its wide application. Usually, it is necessary to adopt technical means such as coating or disperse into stable materials to improve its stability. The glass material has good stability, and the cesium lead halide perovskite nanocrystal is dispersed in it, which can isolate the influence of the external environment on the stability of the cesium lead halide perovskite nanocrystal. Although the preparation process of cesium lead halide perovskite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00C03C3/074B82Y10/00B82Y30/00H01L33/50
CPCC03C21/002C03C3/074H01L33/502H01L33/501B82Y10/00B82Y30/00
Inventor 刘超周耀叶英李凯张玉东
Owner WUHAN UNIV OF TECH
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