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A kind of multi-mode light emitting lead-free double perovskite material and preparation method thereof

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

Active Publication Date: 2022-06-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • 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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  • A kind of multi-mode light emitting lead-free double perovskite material and preparation method thereof
  • A kind of multi-mode light emitting lead-free double perovskite material and preparation method thereof
  • A kind of multi-mode light emitting lead-free double perovskite material and preparation method thereof

Examples

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Embodiment 1

[0025] Example 1: The lead-free double perovskite material with multimodal 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 multimodal 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 mol 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 is added to the mixture of cesium chloride, sodium chloride, bismuth chloride, ytterbium chloride and erbium chloride In the mixture, the reaction was stirred at a high temperature for 40 min at a temperature of 200 °C, and then ultrasonically treated at room temperature fo...

Embodiment 2

[0029] Example 2: The lead-free double perovskite material with multimodal light emission in this example, 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 multimodal 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 mol 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 is added to cesium chloride, sodium chloride, bismuth chloride, ytterbium chloride and erbium chloride In the mixture, the reaction was stirred at a high temperature for 90 min at a temperature of 180 °C, and then ultrasonically treated at room temperature for 8 min to obta...

Embodiment 3

[0033] Example 3: The lead-free double perovskite material with multimodal light emission in this example, 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 multimodal 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 mol 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 is added to cesium chloride, sodium chloride, bismuth chloride, ytterbium chloride and erbium chloride In the mixture, the reaction was stirred at a high temperature at a temperature of 190 °C for 40 min, and then ultrasonically treated at room temperature for 15 min to obt...

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Abstract

The invention discloses a multi-mode light-emitting lead-free double perovskite material and a preparation method thereof, belonging to the technical field of perovskite scintillator materials. The lead-free double perovskite material with multi-mode light emission of the present invention has a chemical formula of Cs 2 NaBiCl 6 :Yb 3+ ,Er 3+ . The present invention utilizes hydrothermal method to synthesize Cs 2 NaBiCl 6 The lead-free double perovskite material can solve the problems of toxicity and poor stability of lead-based perovskite; 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 under the excitation of 375nm ultraviolet The luminescent color can be tuned, excellent green luminescence can be realized under the excitation of X-rays (tube voltage 40KV, tube current 30mA), and high brightness can still be maintained after 60 consecutive cycles (3600s) of high-energy X-ray radiation; the present invention The lead-free double perovskite material is a fluorescent material with multi-mode excitation and luminescence, realizing a single matrix Cs 2 NaBiCl 6 The application of lead-free double perovskite materials in the fields of information security, fluorescent display and X-ray detection.

Description

technical field [0001] The invention relates to a lead-free double perovskite material with multimodal light emission and a preparation method thereof, and belongs to the technical field of lead-free double perovskite light-emitting materials. Background technique [0002] Lead-based halide perovskite materials are a hot spot in perovskite research because of their excellent properties, such as suitable band gaps, long hole-electron diffusion lengths, and high defect tolerance. However, the toxicity and poor stability of lead are the main bottlenecks for the further commercial application of these emerging materials. For environmental friendliness and sustainable development, the use of non-toxic or low-toxic non-lead elements to replace lead and improve the stability of perovskite materials is an inevitable trend in the development of perovskite materials. To solve these problems, new lead-free double perovskite materials based on non-toxic elements with high structural st...

Claims

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Application Information

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Patent Type & Authority Patents(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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