A kind of controllable neodymium-doped high light-efficiency blue perovskite quantum dots and preparation method thereof

A perovskite and neodymium doping technology is applied in the field of controllable neodymium doped high light-efficiency blue light perovskite quantum dots and their preparation, which can solve the problem of small emission wavelength shift, improvement of perovskite quantum dot quantum dot efficiency, etc. problems, to achieve the effect of improving the tolerance factor, optimizing the thermal cycle stability, and improving the insufficient stability

Active Publication Date: 2021-09-28
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent only pointed out the solution to the phenomenon of fluorescence quenching and the so-called small shift of the emission wavelength. It did not clarify whether the wavelength shift was blue shifted or red shifted, how much it moved, and where the specific pain points to be solved by the wavelength shift were. The second is to solve the quenching phenomenon without mentioning whether it will improve the quantum dot efficiency of the perovskite quantum dot itself

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  • A kind of controllable neodymium-doped high light-efficiency blue perovskite quantum dots and preparation method thereof
  • A kind of controllable neodymium-doped high light-efficiency blue perovskite quantum dots and preparation method thereof
  • A kind of controllable neodymium-doped high light-efficiency blue perovskite quantum dots and preparation method thereof

Examples

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Embodiment 1

[0053] A neodymium-doped blue-green light perovskite quantum dot colloid solution, the quantum dot material structure is composed of CsPbBr 3 :xNd (x=2.7%), according to ligand-assisted synthesis under room temperature and air environment, the specific synthesis process is as follows:

[0054] The difference between this embodiment and the specific embodiment of Comparative Example 1 is that the solid powder weighed in step (1) is 36.7 mg of lead bromide, 21.3 mg of cesium bromide and 14.8 mg of neodymium bromide hexahydrate. Other steps are the same as those in the specific embodiments (1) to (4) of Comparative Example 1.

[0055] Above-mentioned embodiment 1 prepares sample emission spectrum as figure 1 As shown in 2, the absorption spectrum is as figure 2 As shown in middle 2, the TEM topography is as follows Figure 4 As shown, the XRD pattern is as Figure 9 Shown in 2. Its maximum fluorescence emission wavelength is 494nm, the fluorescence quantum yield is 78%, and...

Embodiment 2

[0057] A neodymium-doped blue-green light perovskite quantum dot colloid solution, the quantum dot material structure is composed of CsPbBr 3 :xNd (x=3.5%), according to ligand-assisted synthesis under room temperature and air environment, the specific synthesis process is as follows:

[0058] The difference between this embodiment and the specific embodiment of Comparative Example 1 is that the solid powder weighed in the step (1) is 36.7 mg of lead bromide, 21.3 mg of cesium bromide and 29.5 mg of neodymium bromide hexahydrate. Other steps are the same as those in the specific embodiments (1) to (4) of Comparative Example 1.

[0059] Above-mentioned embodiment 2 prepares sample emission spectrum as figure 1 As shown in 3, the absorption spectrum is as figure 2 As shown in middle 3, the TEM topography is as follows Figure 5 As shown, the XRD pattern is as Figure 9 Shown in 3. Its maximum fluorescence emission wavelength is 484nm, the fluorescence quantum yield is 75%,...

Embodiment 3

[0061] A neodymium-doped blue light perovskite quantum dot colloid solution, the quantum dot material structure is composed of CsPbBr 3 :xNd (x=6.0%), according to ligand-assisted synthesis under room temperature and air environment, the specific synthesis process is as follows:

[0062] The difference between this embodiment and the specific embodiment of Comparative Example 1 is that the solid powder weighed in step (1) is 36.7 mg of lead bromide, 21.3 mg of cesium bromide and 44.3 mg of neodymium bromide hexahydrate. Other steps are the same as those in the specific embodiments (1) to (4) of Comparative Example 1.

[0063] Above-mentioned embodiment 3 prepares sample emission spectrum as figure 1 As shown in 4, the absorption spectrum is as figure 2 As shown in middle 4, the TEM topography is as follows Image 6 As shown, the XRD pattern is as Figure 9 Shown in 4. Its maximum fluorescence emission wavelength is 472nm, the fluorescence quantum yield is 84%, and the ha...

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Abstract

The invention belongs to the technical field of photoelectric material preparation, and specifically relates to a controllable neodymium-doped high-efficiency blue perovskite quantum dot and a preparation method thereof. body, using dimethylformamide or dimethyl sulfoxide as a solvent, using a ligand-assisted method to in-situ synthesize neodymium-doped blue perovskite quantum dots in toluene solution, the quantum dots are efficient and stable, and can be solution-processed. Easy and fast. By introducing neodymium doping, the fluorescence quantum yield of perovskite quantum dots can be improved. For single bromine halogen perovskite quantum dots, the controllability of the fluorescence peak of perovskite quantum dots can be achieved by changing the doping ratio of neodymium in the precursor solution. Blue shift, blue-green luminescence peak between 459nm-520nm, for neodymium-doped bromine-lead perovskite quantum dots at 459nm luminescence peak, its fluorescence quantum yield is as high as 90% and the half-wave width is only 19nm.

Description

technical field [0001] The invention belongs to the technical field of photoelectric material preparation, and specifically relates to a controllable neodymium-doped high-light-efficiency blue perovskite quantum dot and a preparation method thereof. Background technique [0002] All-inorganic lead halide perovskite quantum dots (CsPbX 3 ; wherein X=Cl, Br or I) are widely used in solar cells, laser devices, light-emitting diodes, backlight displays, etc. device field, has great application prospects. [0003] Although through vigorous research and development in recent years, it is reported that the known red and green CsPbX 3 Perovskite quantum dots have a very high fluorescence quantum yield close to 100%. However, in the blue light band, the quantum efficiency of quantum dots obtained by simply adjusting Cl and Br halogens is usually low (below 30%) and stable. poor stability, which limits its potential for industrial applications. In addition, because the components ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/7757
Inventor 谢毓俊张树宇董钰蓉区琼荣
Owner FUDAN UNIV
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