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Method for preparing perovskite quantum dots by low-temperature solution process

A low-temperature solution method, perovskite technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of complicated operation, increased experimental operation, and great impact on the precursor environment, and achieves simple operation, high development value, and high development value. The effect of high photoelectric conversion efficiency

Active Publication Date: 2016-07-06
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] Literature (ProtesescuL, YakuninS, BodnarchukMI, etal.NanoLett., 2015, 15(6), pp3692–3696) discloses a perovskite quantum dot synthesized by a high temperature method, but this high temperature synthesis method requires an inert gas environment Synthesized under the environment, and because the precursor used is greatly affected by the environment, it needs to be prepared under the protection of an inert gas, which adds difficulty to the experimental operation and the operation is more complicated

Method used

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  • Method for preparing perovskite quantum dots by low-temperature solution process
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Embodiment 1

[0027] Synthesis of CsPbBr by low temperature solution method described in this embodiment 3 The synthetic method of perovskite quantum dots specifically comprises the following steps:

[0028] 1) Add 80mL of toluene to the round bottom flask and place it in a heating mantle at 80°C. After keeping the temperature stable at 80°C, turn on the magnetic stirring at a stirring speed of 800r / min. The heating and stirring are carried out in the air without inertness Gas protection.

[0029] 2) the metal halide salt PbBr 2 and CsBr were completely dissolved in DMSO at a molar ratio of 1:1 to form a precursor solution.

[0030] 3) Then add 5-10 drops of oleic acid / oleylamine (volume ratio 10:1) mixture into the DMSO solution as a surfactant, and mix the solution evenly.

[0031] 4) Rapidly inject the prepared precursor mixture into toluene that is being heated and stirred at a volume ratio of 1:80, react for 5-10 seconds, and rapidly cool to room temperature with water.

[0032] 5)...

Embodiment 2

[0034] Similar to Example 1, the difference is that the temperature in step 1) of Example 1 is changed to 0° C., the heating device is changed to an ice bath, and other conditions remain the same.

Embodiment 3

[0036] Similar to Example 1, the difference is that the temperature in step 1) of Example 1 is changed to 140° C., and other conditions remain the same.

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Abstract

The invention relates to a method for synthesizing high-luminescence-efficiency wide-color-range metal halide perovskite quantum dots by a low-temperature solution process. A solution injection process is utilized to synthesize the uniform-size high-dispersity metal halide perovskite quantum dots. The method comprises the following steps: keeping a reaction solvent at a certain temperature while stirring, quickly injecting a metal halide precursor salt into the reaction solvent, and finally, carrying out water cooling to room temperature, thereby obtaining the metal halide perovskite quantum dots with very high luminescence efficiency. The halogen doping ratio can be adjusted to obtain the color light with all wavelengths from infrared light to ultraviolet light, and thus, the perovskite quantum dots have wide luminescence range.

Description

technical field [0001] The invention relates to a solution preparation method for preparing metal halide perovskite quantum dots by a low-temperature solution method, and belongs to the field of preparation of new nanometer materials. Background technique [0002] As an ideal energy source, solar energy has been widely valued by people, but photovoltaic power generation has become the biggest obstacle to the utilization of solar energy due to its high price and low energy conversion rate of current photovoltaic materials. Halide perovskites (ABX) developed in recent years 3 ) materials have become a research hotspot due to their high energy conversion rate and excellent photovoltaic performance. The light conversion efficiency of perovskite materials can reach more than 20%. The exciton binding energy is small, and the exciton diffusion length is large, so it is a very potential photovoltaic material. Compared with the commonly used organic-inorganic hybrid perovskite, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66
CPCC09K11/665
Inventor 曾海波许蕾梦薛洁宋继中李建海董宇辉
Owner NANJING UNIV OF SCI & TECH
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