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A blue light perovskite with high quantum yield and its preparation method and application

A perovskite and high-quantum technology, applied in chemical instruments and methods, luminescent materials, semiconductor devices, etc., can solve problems such as difficult to cover the full blue light spectrum, difficult to standard blue light emission, blue shift of the spectrum, etc., to achieve this goal Significant radiation recombination improvement, enhanced quantum yield, high quantum yield effect

Active Publication Date: 2020-11-10
SOUTHWEST JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

But if CsPbBr 3 Prepared as a two-dimensional nanosheet, due to the quantum confinement effect, the band gap becomes larger and the spectrum is blue-shifted, which may make CsPbBr 3 emit blue light
The advantage of this method is that the quantum yield is high, but there are also two defects. One is that it is difficult to achieve standard blue light emission, usually two-dimensional CsPbBr 3 The emission peak of CsPbBr is at 480-490 nanometers, which is a sky blue area. Strictly speaking, it is not blue, and this shortcoming is difficult to overcome. CsPbBr has not been successfully realized yet. 3 Reports of standard blue light emission appear; second, this method is still difficult to achieve full blue light spectrum coverage, that is, it does not have easy tunability of light emission

Method used

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  • A blue light perovskite with high quantum yield and its preparation method and application
  • A blue light perovskite with high quantum yield and its preparation method and application
  • A blue light perovskite with high quantum yield and its preparation method and application

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Embodiment 1

[0037] This embodiment provides a method for preparing blue light perovskite with high quantum yield. Specifically include the following steps:

[0038] 1. Prepare the precursor.

[0039] Take 0.8g Cs2 CO 3 , 40ml of octadecene and 2.5ml of oleic acid were placed in a 100ml three-necked flask, heated to 120°C for 1 hour under Ar conditions, then the solution was heated to 150°C, and kept for ten minutes to form a cesium oleate solution precursor , and then naturally cooled to room temperature for later use, and then heated to 120°C when needed.

[0040] 2. Preparation of CsPbBr 3 .

[0041] (1) Take 0.4mmol PbBr 2 and 10ml of octadecene were placed in a 100ml three-necked flask, heated to 120°C for 1 hour under Ar conditions, and then 1ml of oleic acid and 1ml of oleylamine were quickly injected, and the solution immediately became clear, and then the prepared first mixed solution Heated to 180°C for later use. In addition, in other embodiments, PbBr can also be 2 Reac...

Embodiment 2

[0059] This example is for CsPbCl 3 The luminous intensity before and after optimization was detected. Test result reference figure 2 shown by figure 2 Available, unoptimized CsPbCl 3 Low luminous intensity, optimized CsPbCl 3 Luminescence intensity is much higher than that of unoptimized CsPbCl 3 , under UV light irradiation, the optimized CsPbCl 3 The color is pink, while the optimized CsPbCl 3 The color is weaker.

Embodiment 3

[0061] This example is for CsPbCl 3 The optimized blue light spectrum and quantum yield were detected. After completing the CsPbCl 3 After optimization, the optimized CsPbCl 3 directly with CsPbBr 3 mixed to obtain CsPbBr x Cl 3-x . CbBr x Cl 3-x blue light spectrum reference image 3 As shown in a, by adjusting the CsPbCl 3 with CsPbBr 3 The ratio can achieve the coverage of the full blue light spectrum range. refer to image 3 As shown in b, when CsPbCl 3 with CsPbBr 3 When the ratio is 1:1, the quantum yield is as high as 89%, the average quantum yield is higher than 85%, and the quantum yield is much higher than that of the prior art.

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Abstract

The invention discloses a blue light perovskite with a high quantum yield and a preparation method and applications thereof, and relates to the technical field of luminescent materials. The blue light perovskite has a high quantum yield and a light emission adjustable property, and the full blue light spectrum is covered. According to the preparation method, through PrCl3 doping, the surface of perovskite is optimized, the vacancy defects in the perovskite surface are passivated, the surface ligands are reduced, non-radiation recombination is reduced, intrinsic radiation recombination is increased, and the quantum yield is improved.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a blue light perovskite with high quantum yield and its preparation method and application. Background technique [0002] Perovskite (MPbX 3 , M=CH 3 NH 3+ ,HC(NH 2 ) 2+ ,Cs + ; X=Cl, Br, and I) as a new kind of semiconductor material, due to its excellent optical properties, such as high quantum yield, narrow emission line width, long carrier diffusion length, by adjusting the particle size Size, three-dimensional scale, and halogen ratio can adjust its band gap to emit colors covering the entire visible light, making it a star material in the fields of solar cells, photodetectors, and light-emitting displays. [0003] At present, the red light perovskite (CsPbI 3 ) and green perovskite (CsPbBr 3 ) quantum yield has exceeded 90%, but the quantum yield of blue light perovskite is much lower than that of red light perovskite and green light perovskite. As on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66H01L31/032H01L33/26
CPCC09K11/7705H01L31/0321H01L33/26
Inventor 杨维清骆超李文付吉
Owner SOUTHWEST JIAOTONG UNIV
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