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Multi-mode luminous lead-free double perovskite material and preparation method thereof

A double perovskite, multi-modal technology, applied in luminescent materials, chemical instruments and methods, etc., to achieve the effect of simple process, good stability, and not easy to damage

Active Publication Date: 2021-06-25
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problem in the prior art that the multi-modal excitation and luminescence of a single-matrix lead-free double perovskite material cannot be realized, the present invention provides a multi-modal luminescent lead-free double perovskite material and a preparation method thereof. The present invention utilizes Hydrothermal Synthesis of Cs 2 NaBiCl 6 Lead-free double perovskite material, and through the doping of rare earth ions ytterbium and erbium, it can realize high-brightness green light emission under the excitation of 980nm laser, and realize the tunable emission color under the excitation of 375nm ultraviolet. Under the excitation of tube current 30mA), excellent green luminescence can be achieved, and high brightness can still be maintained after 60 consecutive cycles (3600s) of high-energy X-ray radiation;

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  • Multi-mode luminous lead-free double perovskite material and preparation method thereof
  • Multi-mode luminous lead-free double perovskite material and preparation method thereof
  • Multi-mode luminous lead-free double perovskite material and preparation method thereof

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Embodiment 1

[0025] Example 1: The lead-free double perovskite material with multi-mode light emission in this example, the chemical formula is Cs 2 NaBiCl 6 :20%Yb 3+ ,10%Er 3+ ;

[0026] The preparation method of the lead-free double perovskite material with multi-mode light emission, the specific steps are as follows:

[0027] (1) Weigh cesium chloride, sodium chloride, bismuth chloride, ytterbium chloride and erbium chloride according to the stoichiometric ratio, wherein the molar ratio of ytterbium chloride, erbium chloride and bismuth chloride is 2:1:7 , the total molar weight of ytterbium chloride, erbium chloride and bismuth chloride is 2mmol, and the concentrated hydrochloric acid that concentration is 7mol / L joins cesium chloride, sodium chloride, bismuth chloride, ytterbium chloride and erbium chloride In the mixture, the reaction was stirred at a high temperature for 40 minutes at a temperature of 200 ° C, and then ultrasonically treated at room temperature for 10 minutes t...

Embodiment 2

[0029] Embodiment 2: The lead-free double perovskite material with multi-mode light emission in this embodiment, the chemical formula is Cs 2 NaBiCl 6 :20%Yb 3+ ,20%Er 3+ ;

[0030] The preparation method of the lead-free double perovskite material with multi-mode light emission, the specific steps are as follows:

[0031] (1) Weigh cesium chloride, sodium chloride, bismuth chloride, ytterbium chloride and erbium chloride according to the stoichiometric ratio, wherein the molar ratio of ytterbium chloride, erbium chloride and bismuth chloride is 2:2:6 , the total molar weight of ytterbium chloride, erbium chloride and bismuth chloride is 2mmol, and the concentrated hydrochloric acid that concentration is 8mol / L joins cesium chloride, sodium chloride, bismuth chloride, ytterbium chloride and erbium chloride In the mixture, the reaction was stirred at a high temperature for 90 minutes at a temperature of 180 ° C, and then ultrasonically treated at room temperature for 8 minu...

Embodiment 3

[0033] Embodiment 3: The lead-free double perovskite material with multi-mode light emission in this embodiment, the chemical formula is Cs 2 NaBiCl 6 :20%Yb 3+ ,30%Er 3+ ;

[0034] The preparation method of the lead-free double perovskite material with multi-mode light emission, the specific steps are as follows:

[0035] (1) Weigh cesium chloride, sodium chloride, bismuth chloride, ytterbium chloride and erbium chloride according to the stoichiometric ratio, wherein the molar ratio of ytterbium chloride, erbium chloride and bismuth chloride is 2:3:5 , the total molar weight of ytterbium chloride, erbium chloride and bismuth chloride is 2mmol, and the concentrated hydrochloric acid that concentration is 9mol / L joins cesium chloride, sodium chloride, bismuth chloride, ytterbium chloride and erbium chloride In the mixture, the reaction was stirred at a high temperature for 40 minutes at a temperature of 190 ° C, and then ultrasonically treated at room temperature for 15 min...

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Abstract

The invention discloses a multi-mode luminous lead-free double perovskite material and a preparation method thereof, and belongs to the technical field of perovskite scintillator materials. The multi-mode luminous lead-free double perovskite material has a chemical formula of Cs2NaBiCl6: Yb<3+>,Er<3+>. The Cs2NaBiCl6 lead-free double perovskite material is synthesized by utilizing a hydrothermal method, so that the problems of poor toxicity and stability of lead-based perovskite can be solved; by doping rare earth ions ytterbium and erbium, high-brightness green light emission is realized under the excitation of a 980 nm laser, the light emission color is tunable under the excitation of 375 nm ultraviolet, excellent green light emission is realized under the excitation of X-rays (tube voltage of 40 KV and tube current of 30 mA), and relatively high brightness can still be kept after 60 times of continuous circulation (3600 s) radiation of the high-energy X-rays; the lead-free double perovskite material disclosed by the invention is a multi-mode excited luminous fluorescent material, and the application of the single-matrix Cs2NaBiCl6 lead-free double perovskite material in the fields of information safety, fluorescence display, X-ray detection and the like is realized.

Description

technical field [0001] The invention relates to a multi-mode luminescent lead-free double perovskite material and a preparation method thereof, belonging to the technical field of lead-free double perovskite luminescent materials. Background technique [0002] Lead-based halide perovskite materials are the hotspot of perovskite research because of their excellent properties, such as suitable band gap, long hole-electron diffusion length, high defect tolerance and so on. However, the toxicity and poor stability of lead are the major bottlenecks for the further commercial application of these emerging materials. In order to be environmentally friendly and sustainable, it is an inevitable trend in the development of perovskite materials to replace lead with non-toxic or low-toxic non-lead elements and improve the stability of perovskite materials. To solve these problems, new lead-free double perovskite materials based on non-toxic elements and high structural stability have a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/74
CPCC09K11/7773
Inventor 余雪崔珍珍刘志超马宏卿吴涛杨玺徐旭辉邱建备
Owner KUNMING UNIV OF SCI & TECH
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