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Application of double perovskite nanocrystalline material in preparation of inorganic white light LED

A technology of nanocrystalline material and double perovskite, applied in nano optics, luminescent materials, nanotechnology, etc., can solve the problems of low color rendering index and low luminous efficiency of white LED

Active Publication Date: 2019-11-22
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an application of double perovskite nanocrystals in the preparation of inorganic white light LEDs. A double perovskite material with a specific composition is selected to make nanocrystals. Partial replacement of the elements of each site in the perovskite, compared with the existing technology, can obtain inorganic white light LEDs with adjustable color temperature, and effectively solve the problems of low luminous efficiency and low color rendering index of white light LEDs

Method used

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  • Application of double perovskite nanocrystalline material in preparation of inorganic white light LED
  • Application of double perovskite nanocrystalline material in preparation of inorganic white light LED
  • Application of double perovskite nanocrystalline material in preparation of inorganic white light LED

Examples

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Effect test

Embodiment 1

[0063] Cs 2 AgInCl 6 Preparation of Nanocrystals. The preparation method is as follows:

[0064] Weigh 0.2mmol cesium chloride (CsCl), 0.1mmol silver chloride (AgCl) and .01mmol indium chloride (InCl) 3 ), the purity of the above raw materials is more than 99.9%. The weighed above-mentioned raw materials were poured into a 25ml sample bottle, and then 10ml DMSO was added. Put the sample vial in a sand bath and heat and stir at 80°C to dissolve. After it is completely dissolved, turn off the heating and stirring, take out the sample bottle, and reserve the precursor solution for later use. Use a pipette gun to take 100 microliters of the precursor solution and inject it into 5ml of isopropanol, and stir vigorously for 5 minutes to end the reaction. The reaction solution was centrifuged at 5000 rpm for 10 min, the bottom precipitate was discarded, and the supernatant was set aside.

[0065] The average particle size of the perovskite nanocrystals prepared in this example ...

Embodiment 2

[0067] Cs 2 NaInCl 6 Preparation of Nanocrystals. The preparation method is as follows:

[0068] Weigh 0.2mmol cesium chloride (CsCl), 0.1mmol sodium chloride (NaCl) and 0.1mmol indium chloride (InCl) respectively 3 ), the purity of the above raw materials is more than 99.9%. The weighed above-mentioned raw materials were poured into a 25ml sample bottle, and then 10ml DMSO was added. Put the sample vial in a sand bath and heat and stir at 120°C to dissolve. After it is completely dissolved, turn off the heating and stirring, take out the sample bottle, and reserve the precursor solution for later use. Use a pipette gun to take 100 microliters of the precursor solution and inject it into 5ml of isopropanol, and stir vigorously for 3 minutes to end the reaction. The reaction solution was centrifuged at 5000 rpm for 5 min, the bottom precipitate was discarded, and the supernatant was set aside.

[0069] The average particle size of the perovskite nanocrystals prepared in ...

Embodiment 3

[0071] Cs 2 Ag 0.8 Na 0.2 InCl 6 Preparation of Nanocrystals. The preparation method is as follows:

[0072] Weigh and weigh 0.2mmol cesium chloride (CsCl), 0.08mmol silver chloride (AgCl), 0.02mmol sodium chloride (NaCl) and 0.1mmol indium chloride (InCl) respectively. 3 ), the purity of the above raw materials is more than 99.9%. The weighed above-mentioned raw materials were poured into a 25ml sample bottle, and then 10ml DMSO was added. Put the sample vial in a sand bath and heat and stir at 80°C to dissolve. After it is completely dissolved, turn off the heating and stirring, take out the sample bottle, and reserve the precursor solution for later use. Use a pipette gun to take 100 microliters of the precursor solution and inject it into 5ml of isopropanol, and stir vigorously for 5 minutes to end the reaction. The reaction solution was centrifuged at 5000 rpm for 10 min, the bottom precipitate was discarded, and the supernatant was set aside.

[0073] The averag...

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Abstract

The invention belongs to the technical field of luminescent materials, and more specifically relates to an application of a double perovskite nanocrystalline material in preparation of an inorganic white light LED, the chemical general formula of the lead-free double perovskite nanocrystalline material is Cs<2-x>A<x>Ag<1-y>B<y>In<1-z>C<z>D<6>, and A and B are independently positive monovalent cations; C is a positive trivalent cation; D is a halogen anion; 0 < = x < = 1; 0 < = y < = 1.0; 0 < = z < = 1.0. According to the invention, the composition of each lattice element in the double perovskite is partially substituted; by controlling and replacing the corresponding molar fractions x, y and z, the correspondingly obtained ultraviolet-excited double-perovskite single-matrix white-light nanocrystalline is wide in emission spectrum range and simple to prepare, the related color temperature can be flexibly regulated and controlled along with components, and the ultraviolet-excited double-perovskite single-matrix white-light nanocrystalline is particularly suitable for electroluminescent LED chips.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and more specifically relates to the application of a double perovskite nanocrystal material in the preparation of inorganic white light LEDs. Background technique [0002] In general, white LEDs are devices that combine LED chips and phosphors to emit white light when energized. This white light comes from the combination of chip and phosphor light emission or the combination of multi-color phosphor light emission, and it is not a light-emitting diode with electroluminescent white light in the true sense. Diodes with a variety of light-emitting colors have been realized, including purple, blue, green, yellow, red, and white. However, the light-emitting layer of the existing white light-emitting diode is limited to organic matter and has extremely low light efficiency, and the development of white light-emitting diodes with inorganic matter as the light-emitting layer is slow. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/62C09K11/74C09K11/85B82Y20/00B82Y40/00H01L33/50
CPCB82Y20/00B82Y40/00C09K11/628C09K11/7435C09K11/7705H01L33/502Y02B20/00
Inventor 宋海胜
Owner HUAZHONG UNIV OF SCI & TECH
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