Method for promoting crystallization of all-inorganic perovskite quantum dots in glass by adding fluoride

A fluoride and quantum dot technology, applied in the field of solid luminescent materials, can solve the problems of a large amount of components volatilizing, it is difficult to effectively precipitate quantum dots, etc., and achieve the effects of high quantum efficiency, excellent long-term stability and good transparency.

Active Publication Date: 2019-09-03
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It should be pointed out that this method usually requires the melting of glass at high temperature, resulting in a large amount of

Method used

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  • Method for promoting crystallization of all-inorganic perovskite quantum dots in glass by adding fluoride
  • Method for promoting crystallization of all-inorganic perovskite quantum dots in glass by adding fluoride
  • Method for promoting crystallization of all-inorganic perovskite quantum dots in glass by adding fluoride

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Embodiment 1

[0022] Embodiment 1: SiO 2 , B 2 o 3 , ZnO, Cs 2 CO 3 , PbBr 2 , NaBr and CaF 2 According to 40SiO 2 :20B 2 o 3 :10ZnO:15Cs 2 CO 3 :10PbBr 2 :5NaBr:5CaF 2 The ratio of (molar ratio) is accurately weighed, ground evenly in an agate mortar, placed in a crucible, heated to 1150°C in a resistance furnace for 15 minutes, and then quickly poured molten glass into a copper mold for molding; Then the glass continues to be heated and kept at 520°C for 2 hours to make it crystallize to obtain CsPbBr 3 Embedded perovskite quantum dot glass material.

[0023] The X-ray diffraction pattern shows that the precursor glass is a typical amorphous structure, and the cubic structure CsPbBr is precipitated in the borosilicate glass substrate after heat treatment 3 quantum dots ( figure 1 ), the transmission electron microscope observation shows that there are a large number of CsPbBr with a size of about 10nm uniformly distributed in the glass 3 Grain ( figure 2 ), the integral ...

Embodiment 2

[0024] Embodiment 2: SiO 2 , B 2 o 3 , ZnO, Cs 2 CO 3 , PbBr 2 , NaBr and NH 4 F according to 40SiO 2 :20B 2 o 3 :10ZnO:15Cs 2 CO 3 :10PbBr 2 :5NaBr:20NH 4 The proportion of F (molar ratio) is accurately weighed, ground evenly in an agate mortar, placed in a crucible, heated to 1150°C in a resistance furnace for 8 minutes, and then the molten glass is quickly poured into a copper mold for molding ; Then the glass is heated and kept at 480°C for 6 hours to make it crystallize, and obtain CsPbBr 3 Embedded with perovskite quantum dot glass material, the sample emits bright green light under the irradiation of ultraviolet light.

Embodiment 3

[0025] Embodiment 3: SiO 2 , B 2 o 3 , ZnO, Cs 2 CO 3 , PbBr 2 , NaBr and YF 3 According to 40SiO 2 :20B 2 o 3 :10ZnO:15Cs 2 CO 3 :10PbBr 2 :5NaBr:10YF 3 The ratio of (molar ratio) is accurately weighed, ground evenly in an agate mortar, placed in a crucible, heated to 1150°C in a resistance furnace for 8 minutes, and then quickly poured molten glass into a copper mold for molding; Then the glass continues to be heated and kept at 480°C for 2 hours to make it crystallize to obtain CsPbBr 3 Embedded with perovskite quantum dot glass material, the sample emits bright green light under the irradiation of ultraviolet light.

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Abstract

The invention relates to a method for promoting the crystallization of all-inorganic perovskite quantum dots in glass by adding a fluoride. The method includes: placing the powder raw materials SiO2,B2O3, ZnO, Cs2CO 3, PbX2, NaX and a fluoride compound in an agate mortar to be ground evenly, then putting the product in a crucible and placing the crucible in a resistance furnace for heating to 1150-1200DE C, and conducting heat preservation for 8-15min, thus obtaining molten glass; pouring the molten glass rapidly into a copper mould for molding to obtain precursor glass; putting the precursorglass into a 480-520DEG C resistance furnace and performing heat treatment for 8-15min to crystallize perovskite in the precursor glass, thus obtaining the perovskite quantum dot embedded borosilicate glass. The CsPbX3 (X=Cl, Br, I) quantum dots in the obtained perovskite quantum dot glass can all grow up, can realize visible light full-spectrum emission, and are uniform in luminescence and goodin transparency.

Description

technical field [0001] The invention relates to the field of solid luminescent materials, in particular to a new method for promoting the crystallization of perovskite quantum dots in glass. Background technique [0002] All inorganic CsPbX 3 (X=Cl,Br,I) perovskite quantum dot materials have excellent optical properties, such as narrow half-width (12-42nm), high quantum efficiency (~100%), and wide color gamut etc. are gradually becoming the "new darling" of research in the field of optoelectronics. Although perovskite quantum dots have a series of unparalleled advantages, due to their low formation energy and the characteristics of ionic crystals, the material's poor light, thermal and water stability has become a bottleneck that limits its application. Using polymer compounds or silicon dioxide to coat perovskite quantum dots can improve the stability of quantum dots to a certain extent, but because the coating layer is not a dense structure, it cannot fundamentally solv...

Claims

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Application Information

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IPC IPC(8): C03C10/16C03C4/12
CPCC03C10/16C03C4/12
Inventor 柳月周谡陈大钦钟家松
Owner HANGZHOU DIANZI UNIV
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