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Quantum dot film and preparation method thereof

A technology of thin film preparation and quantum dots, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of restricted luminescence stability, limited application, and reduced quantum efficiency, and achieves good stability of quantum dots, narrow emission spectrum, and quantum high efficiency effect

Active Publication Date: 2020-01-10
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional quantum dot film preparation process is directly prepared by coating the quantum dot solution or colloid on the substrate, and its luminous stability is subject to the stability of the quantum dot solution itself, and its quantum efficiency will be greatly reduced, which limits its luminescence. device application

Method used

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  • Quantum dot film and preparation method thereof
  • Quantum dot film and preparation method thereof
  • Quantum dot film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: This embodiment provides a quantum dot film based on perovskite quantum dot glass

[0047] The quantum dots include a multi-layer fluorescent film, wherein each layer of fluorescent film contains a perovskite quantum dot glass powder component and a binder component; the mass ratio of the perovskite quantum dot glass powder to the binder is 0.1 to 0.5 :1. The perovskite quantum dot glass powder includes a glass matrix and a perovskite matrix, wherein the molar percentage of the perovskite matrix is ​​10% to 30% of the glass matrix; the glass matrix is ​​Na 2 O, ZnO, B 2 o 3 , SiO 2 and BaO mixture; the perovskite matrix is ​​Cs 2 CO 3 , PbX 2 and NaX mixture, or CsX and PbX 2 Mixture, wherein X is Cl, Br or I.

[0048] Compound Cs in perovskite matrix 2 CO 3 :PbX 2 : NaX molar ratio is 1:0.5~8:1 or CsX:PbX 2 1:0.5~4.

[0049] Na in glass powder 2 O: 10~20wt.%, ZnO: 10~20wt.%, B 2 o 3 :30~50wt.%, SiO 2 :20~30wt.%,BaO:5~15wt.%,Cs 2 CO 3 :1...

Embodiment 2

[0057] (1) Analytical pure Na 2 O, ZnO, B 2 o 3 , SiO 2 , BaO, Cs 2 CO 3 , PbBr, NaBr, according to: Na 2 O: 10wt.%, ZnO: 15wt.%, B 2 o 3 : 35wt.%, SiO 2 : 20wt.%, BaO: 5wt.%, Cs 2 CO 3 : 5%, PbBr 2 : 5wt.%, NaBr: 5wt.% mole fraction ratio is accurately weighed and placed in an agate mortar, ground evenly in the agate mortar, placed in a corundum crucible, and placed in a muffle furnace at 1150°C Insulate for 10 minutes, then take out the glass melt and quickly cast it in an iron plate mold with a preheating temperature of 250°C to form a transparent glass, heat for 2 hours to eliminate internal stress; then transfer it to a muffle furnace for annealing at 430°C for 5 hours, After natural cooling, the perovskite quantum dot glass can be obtained, and then the cooled perovskite quantum dot glass is ground and passed through a 200-mesh sieve to obtain perovskite quantum dot glass powder;

[0058] (2) Weigh A silica gel, B silica gel, and 5g, 10g, and 3g of the above-...

Embodiment 3

[0062] (1) Analytical pure Na 2 O, ZnO, B 2 o 3 , SiO 2 , BaO, Cs 2 CO 3 , PbI, NaI, according to: Na 2 O: 10wt.%, ZnO: 10wt.%, B 2 o 3 : 30wt.%, SiO 2 : 20wt.%, BaO: 9wt.%, Cs 2 CO 3 : 5wt.%, PbI 2 : 12wt.%, NaI: 6wt.% mole fraction ratio is accurately weighed and placed in an agate mortar, ground evenly in the agate mortar, placed in a corundum crucible, and placed in a muffle furnace at 1150°C Insulated for 10 minutes, and then, the glass melt was taken out and quickly cast in a steel mold with a preheating temperature of 250°C to obtain a transparent glass, and held for 2 hours to eliminate internal stress; then transferred to a muffle furnace for annealing at 480°C for 10 hours, and naturally After cooling, the perovskite quantum dot glass can be obtained, and then the cooled perovskite quantum dot glass is ground and passed through a 200-mesh sieve to obtain perovskite quantum dot glass powder;

[0063] (2) Weigh 10g, 10g, and 3g of A silica gel, B silica gel...

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Abstract

The invention discloses a quantum dot thin film and a preparation method thereof. The quantum dot thin film comprises a plurality of layers of fluorescent thin film, wherein each layer of fluorescentthin film comprises a perovskite quantum dot glass powder component and an adhesive component; the mass ratio of the perovskite quantum dot glass powder to the adhesive is 0.1-0.5: 1. The preparationmethod comprises the following steps: 1, adding a perovskite matrix into a glass matrix, sintering at high temperature, and annealing to prepare perovskite quantum dot glass powder; 2, mixing the perovskite quantum dot glass powder with the adhesive to prepare a fluorescent glue mixture; and 3, heating and curing the fluorescent glue mixture twice to form the quantum dot film. The method is simplein process and low in cost, and the obtained quantum dot film is high in quantum efficiency, narrow in emission spectrum and stable in physical and chemical properties, can be applied to LED lightingand display technologies, and particularly can be applied to flexible light-emitting devices.

Description

technical field [0001] The invention relates to the technical field of semiconductor luminescent materials, in particular to a quantum dot thin film and a preparation method thereof. Background technique [0002] Recently, all-inorganic halides (CsPbX 3 ) perovskite quantum dots have great potential application value in the fields of light-emitting diodes, lasers, polarizers, solar cells, and photodetectors due to their tunable emission wavelengths, high fluorescence quantum efficiency, and narrow emission peaks. CaB 3 Quantum dots can be well dispersed in many nonpolar solutions, and oil-phase perovskite quantum dots can be packaged into low-cost optoelectronic devices. So far, the luminous wavelength covers the entire visible spectrum (410nm ~ 700nm), the luminous quantum efficiency reaches 90%, and the pure color CsPbX with a quantum size of 4-15nm 3 Quantum dots have been reported. However, perovskite quantum dots synthesized in liquid phase have poor stability in ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C12/00C03C14/00C04B26/06C04B26/14C04B26/18C04B26/32C04B28/24C09K11/02C09K11/66
CPCC03C12/00C03C14/00C04B26/14C04B26/06C04B28/24C04B26/18C04B26/32C09K11/665C09K11/02C04B14/22
Inventor 杨波波梅时良郭睿倩张万路解凤贤叶怀宇张国旗
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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