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CsPbX3 nanocrystalline doped borogermanate glass, and preparation method and application thereof

A germanate glass and nanocrystal technology, which is applied in the field of luminescent materials, can solve the problems of reduced fluorescence efficiency, easy cluster precipitation, poor chemical stability and thermal stability, etc., and achieves improved thermal and chemical stability, quantum High efficiency and controllable size effect

Active Publication Date: 2018-08-31
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although CsPbX synthesized in solution 3 Nanocrystals have high luminous efficiency and simple synthesis process, but the CsPbX synthesized by this method 3 Nanocrystals are easy to cluster and precipitate, easy to decompose in polar solutions, and have very poor chemical and thermal stability, and are easy to react with water and oxygen in the air. 3 Nanocrystals rapidly decrease in fluorescence efficiency due to further growth
Therefore, CsPbX synthesized in solution 3 Nanocrystals require high storage conditions and are not conducive to subsequent processing and device preparation, which will greatly limit the ability of CsPbX 3 Applications of nanocrystals

Method used

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  • CsPbX3 nanocrystalline doped borogermanate glass, and preparation method and application thereof
  • CsPbX3 nanocrystalline doped borogermanate glass, and preparation method and application thereof
  • CsPbX3 nanocrystalline doped borogermanate glass, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The raw materials were weighed in the following atomic mole percentages: Ge: 16%, B: 13.2%, Zn: 1.6%, Ca: 0.9%, Pb: 0.9%, Cs: 3.1%, Na: 3.8%, Br: 3.8%, O : 56.7%. After mixing evenly, melt at 1250°C for 30 minutes, then rapidly cool and shape and anneal to obtain completely transparent glass.

[0081] Put the original glass into a heat treatment furnace, heat treatment at 440-500°C for different times, and then cool down to room temperature with the furnace to obtain CsPbBr 3 The nanocrystal-doped transparent glass is polished and tested.

[0082] figure 1 AP and 450°C / 10h, 470°C / 10h, 480°C / 10h, 500°C / 10h heat-treated samples under the fluorescent lamp (AP represents the original glass sample without heat treatment, 450°C / 10h, etc. represent the temperature Heat treatment at 450°C for 10h).

[0083] figure 2 XRD patterns of the original glass and its heat-treated samples under different conditions. Depend on figure 2 It can be seen that in addition to the "stea...

Embodiment 2

[0087] The raw materials were weighed in the following atomic mole percentages: Ge: 15.9%, B: 12.7%, Zn: 1.6%, Ca: 1.6%, Pb: 0.9%, Cs: 3.2%, Na: 3.8%, Br: 3.8%, O : 56.5%. After mixing evenly, melt at 1250°C for 30 minutes, then rapidly cool and shape and anneal to obtain completely transparent glass.

[0088] Put the raw glass into a heat treatment furnace, treat it at 480 ° C for 4 to 10 hours, and cool it to room temperature with the furnace to obtain CsPbBr 3 The nanocrystal-doped transparent glass is polished and tested. Figure 9 is the original glass and its absorption spectrum at different heat treatment temperatures and times, Figure 10 It is the fluorescence spectrogram of the sample in this example under 400nm excitation. Under the heat treatment condition, the fluorescence peak position can be adjusted within the range of 504-532nm.

Embodiment 3

[0090] The raw materials were weighed according to the following atomic mole percentages: Ge: 15.8%, B: 13%, Zn: 1.6%, Pb: 1%, Cs: 3.1%, Na: 5.6%, Br: 3.7%, O: 56.2%. After mixing evenly, melt at 1250°C for 30 minutes, then rapidly cool and shape and anneal to obtain completely transparent glass.

[0091] Put the original glass into a heat treatment furnace, treat it at 470 ° C for 8 hours, and cool it to room temperature with the furnace to obtain CsPbBr 3 The nanocrystal-doped transparent glass is polished and tested. Figure 11 is the original glass and its absorption spectra at different heat treatment temperatures, Figure 12 It is the fluorescence spectrum diagram of the sample in this embodiment under 400nm excitation, and the adjustable range of fluorescence peak wavelength is 515-519nm.

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Abstract

The invention provides CsPbX3 nanocrystalline doped borogermanate glass, and a preparation method and an application thereof. The CsPbX3 nanocrystalline doped borogermanate glass is composed of the following components in mole percentages: 13.5 to 18.5% of Ge, 6.5 to 15.5% of B, 0 to 5.3 % of Zn, 0 to 2.5% of M, 0.3 to 2.3% of Pb, 1.3 to 4.6% of Cs, 2 to 7.9% of N, 1.6 to 6. 5% of X and 53 to 59%of O, wherein M is any one or a mixture of two or more selected from the group consisting of Ca, Sr or Ba; N is any one or a mixture of two or more selected from the group consisting of Li, Na or K; and X is any one or a mixture of two or more selected from the group consisting of Cl, Br or I. The CsPbX3 nanocrystalline doped borogermanate glass provided by the invention has the advantages of simple process, easy operation, controllable nanocrystalline sizes, and capability of obtaining luminescence in a certain range of visible light wave bands; meanwhile, a glass substrate provides a stablesubstrate environment for nanocrystalline, so thermal stability and chemical stability of the nanocrystalline are significantly improved; and the CsPbX3 nanocrystalline doped borogermanate glass has broad application prospects.

Description

technical field [0001] The invention belongs to the field of luminescent materials, in particular to a CsPbX 3 Nanocrystalline doped borogermanate glass and its preparation method and application. Background technique [0002] Semiconductor nanocrystals are quasi-zero-dimensional semiconductor nanocrystal particles. When the grain size of the semiconductor material gradually decreases, the continuous energy band structure of the bulk material becomes a discrete energy level structure with molecular characteristics; while the movement state of the carriers in the semiconductor nanocrystal will be restricted, and the excited energy Produce fluorescence. As the size of nanocrystals gradually decreases, their forbidden band width gradually increases, which is manifested as absorption and fluorescence in different bands in the spectrum. [0003] CaB 3 (X=Cl, Br, I) class perovskite materials belong to direct bandgap semiconductor materials, and their bandgap energies are resp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C14/00C03B25/00
CPCC03B25/00C03C14/004C03C2214/16
Inventor 刘超叶英张继红韩建军赵修建
Owner WUHAN UNIV OF TECH
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