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Copper-doped red-light perovskite quantum dot and preparation method thereof

A perovskite and copper doping technology, applied in chemical instruments and methods, luminescent materials, nano optics, etc., can solve the problem of poor stability of red light perovskite quantum dots, affecting device efficiency, and blue shift of fluorescence emission wavelength and other problems, to achieve the effects of high efficiency, stability, solution processing, high fluorescence quantum efficiency, and good solubility

Active Publication Date: 2019-05-24
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a copper-doped red light perovskite quantum dot and its preparation method, which greatly improves the red light by doping the transition metal copper and containing bromine and iodine at the same time. The stability of perovskite quantum dots ensures the high fluorescence quantum efficiency of quantum dots close to 90%. The absorption wavelength of the material and the corresponding fluorescence emission wavelength also have a blue shift phenomenon with the increase of copper doping amount, so as to solve the current problem. Some red-light perovskite quantum dots have poor stability, and existing methods to improve their stability affect technical problems such as device efficiency

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  • Copper-doped red-light perovskite quantum dot and preparation method thereof

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preparation example Construction

[0038] In some embodiments, the preparation method specifically includes the following steps:

[0039] (1) Copper salt and oleic acid are mixed and dissolved to obtain a copper precursor solution;

[0040] (2) mixing and heating a cesium salt or a formamidine salt with a mixed solution of octadecene and oleic acid to obtain a cesium or formamidine precursor solution;

[0041](3) under the protection of an inert gas, the mixture of the copper precursor solution, lead iodide and lead bromide obtained in step (1) is mixed with an octadecene solution containing an organic acid and an organic amine, heated and dissolved to obtain a mixed solution, and then Mix the mixed solution with the cesium or formamidine precursor solution obtained in step (2) at 140-180° C. After the reaction, place the reactor in an ice-water bath to stop the reaction to obtain a mixed system of reaction products;

[0042] (4) Mix and centrifuge the reaction product mixture system obtained in step (3) with ...

Embodiment 1

[0062] A red light perovskite quantum dot colloid solution, the quantum dot material structure is composed of CsPb 0.9 Cu 0.1 BrI 2 , the maximum fluorescence emission wavelength is 633nm, the material is cubic phase, and the particle diameter is 8-15 nanometers.

[0063] Prepared as follows:

[0064] Dissolve 0.0341g of copper acetate in 1mL of oleic acid and heat to 90°C until the copper acetate is completely dissolved to obtain a dark green copper oleate precursor. Add 0.1682g of cesium carbonate, 8mL of octadecene, and 0.5mL of oleic acid into a 100mL flask, and heat to 120°C with nitrogen gas until the cesium carbonate is completely dissolved. 0.0230g PbBr 2 with 0.0578gPbI 2 , add 5mL octadecene, 0.1mL copper oleate precursor, 0.4mL oleic acid, 0.5mL oleylamine into a 100ml flask, heat to 120°C and vacuum dry for 1 hour, blow nitrogen, raise the temperature to 150°C, inject the The prepared cesium oleate precursor was 0.4 mL, and immediately cooled to room temperat...

Embodiment 2

[0067] A red light perovskite quantum dot colloid solution, the quantum dot material structure is composed of CsPb 0.8 Cu 0.2 BrI 2 , the maximum fluorescence emission wavelength is 631nm, the material is cubic phase, and the particle size is 8-15nm.

[0068] Prepared as follows:

[0069] Dissolve 0.0341g of copper acetate in 1mL of oleic acid and heat to 90°C until the copper acetate is completely dissolved to obtain a dark green copper oleate precursor. Add 0.1682g of cesium carbonate, 8mL of octadecene, and 0.5mL of oleic acid into a 100mL flask, and heat to 120°C with nitrogen gas until the cesium carbonate is completely dissolved. 0.0230g PbBr 2 with 0.0578gPbI 2 , add 5mL octadecene, 0.2mL copper oleate precursor, 0.3mL oleic acid, 0.5mL oleylamine into a 100ml flask, heat to 120°C and vacuum dry for 1 hour, blow nitrogen, raise the temperature to 150°C, inject the pre- The prepared cesium oleate precursor was 0.4 mL, and immediately cooled to room temperature with...

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Abstract

The invention belongs to the technical field of preparation of optoelectronic materials and particularly relates to a copper-doped red-light perovskite quantum dot and a preparation method thereof. According to the method, a cesium salt or a formamidine salt, copper acetate, lead bromide and lead iodide are adopted as raw materials, organic acids and organic amine are adopted as ligands, and the stable and efficient copper-doped red-light perovskite quantum dot processable in solutions are rapidly synthesized through a thermal injection method. The stability of the red-light perovskite quantumdot is greatly improved through copper doping, and meanwhile, it is ensured that the high-fluorescence quantum efficiency of the quantum dot approaches 90%. According to the quantum dot, the absorption wavelength is increased along with the increase of the doping amount of copper, and a blue shift phenomenon of corresponding fluorescence emission wavelength of the quantum dot occurs. Obtained red-light perovskite quantum dot powder has high stability and can still be stored for more than 15 days under the condition that the air humidity is higher than 85%. The preparation method is simple andenvironmentally friendly, and the obtained red-light perovskite quantum dot can be applied to photoelectric devices such as light-emitting diodes, photoelectric detectors, laser devices and solar cells.

Description

technical field [0001] The invention belongs to the technical field of optoelectronic material preparation, and more specifically relates to a copper-doped red perovskite quantum dot and a preparation method thereof. Background technique [0002] Organic-inorganic metal halide perovskite quantum dots (APbX 3 : where A=Cs or CH (NH 2 ) 2 ; X=Cl, Br or I) because of its advantages such as simple synthesis process, wide color gamut, higher quantum yield, and narrow and adjustable emission spectrum, it is widely used in light-emitting diodes, lasers, photodetectors and solar energy Fields such as batteries have huge potential application value. [0003] Through the development in recent years, the green perovskite quantum dots CsPbBr 3 (The fluorescence emission wavelength is around 520nm) research has made great progress and the stability has also been greatly improved. And red perovskite quantum dots APbBr y I 3-y :( where A=Cs or CH(NH 2 ) 2 ; 0<y<1) (fluoresce...

Claims

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Application Information

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IPC IPC(8): C09K11/66C09K11/06B82Y20/00B82Y40/00
Inventor 屠国力张继斌
Owner HUAZHONG UNIV OF SCI & TECH
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