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CsPbI3 mixed-phase perovskite thin film and controllable preparation method thereof

A perovskite and thin film technology, which is applied in the field of CsPbI3 mixed-phase perovskite thin film and its controllable preparation, can solve difficult problems and achieve the effect of easy implementation, simple method and novel materials

Inactive Publication Date: 2020-11-06
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A single material with efficient and stable white light emission is ideal for illumination, but it is difficult to achieve photon emission covering the entire visible spectrum

Method used

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  • CsPbI3 mixed-phase perovskite thin film and controllable preparation method thereof
  • CsPbI3 mixed-phase perovskite thin film and controllable preparation method thereof
  • CsPbI3 mixed-phase perovskite thin film and controllable preparation method thereof

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Experimental program
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Embodiment 1

[0030] A kind of controllable preparation CsPbI described in this embodiment 3 The method for the mixed-phase perovskite thin film specifically comprises the following steps:

[0031] 1) Add 15 mL of octadecene, 2 ml of oleylamine, 1 ml of oleic acid and 0.5 mmol of lead iodide into a three-necked flask, and place it in a heating mantle at 180°C, vacuumize the device and maintain an argon atmosphere to keep the temperature stable After 180° C., turn on the magnetic stirring at a stirring speed of 800 r / min.

[0032] 2) Cesium stearate and oleic acid were completely dissolved in octadecene at a molar ratio of 1:1.1 to form a precursor solution.

[0033] 3) Rapidly inject the prepared precursor mixture into the heating and stirring reaction solvent at a volume ratio of 1:15, react for 5-10 seconds, and quickly cool to room temperature with water.

[0034] 4) Wash the reaction product obtained above by adding a mixed solution of isopropanol and ethyl acetate, and centrifuge it,...

Embodiment 2

[0039] Similar to Example 1, the difference is that the mixed solution of Virahol and ethyl acetate in step 4 of Example 1 is changed to the mixed solution of Virahol and butyl acetate, and other conditions remain the same, and the CsPbI based 3 Materials for mixed-phase perovskite thin films.

Embodiment 3

[0041] Similar to Example 1, the difference is that the n-octane in step 4) of Example 1 is changed to n-hexane, and other conditions remain the same, and the CsPbI-based 3 Materials for mixed-phase perovskite thin films.

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Abstract

The invention relates to a CsPbI3 mixed-phase perovskite thin film and a controllable preparation method thereof. The controllable preparation method comprises the following operation steps that 1, adding octadecene, oleylamine, oleic acid and lead iodide into a three-neck flask, heating and stirring at the temperature of 140-180 DEG C under the vacuum condition to serve as a reaction solvent; 2,dissolving cesium stearate and oleic acid in octadecene to form a precursor solution; and 3, rapidly injecting the precursor solution into a reaction solvent, rapidly cooling with water, and then centrifugally purifying to obtain the perovskite CsPbI3 quantum dot; and 4, spin-coating a dispersion liquid of the CsPbI3 quantum dots on the surface of a clean glass sheet, and carrying out heat treatment in an atmospheric environment to obtain the CsPbI3 mixed-phase perovskite thin film. The CsPbI3 mixed-phase perovskite thin film is prepared by the method disclosed by the invention. According to the invention, CsPbI3 is used for obtaining a monomer to emit white light, and the material is novel; based on a full-inorganic perovskite material, the perovskite material is more stable than a traditional perovskite material; phase regulation of CsPbI3 is achieved through the temperature and time of heat treatment, and the method is simple and easy to implement.

Description

technical field [0001] The present invention relates to a kind of CsPbI 3 The mixed-phase perovskite film and its controllable preparation method belong to the technical field of new nanometer materials. Background technique [0002] Electrowhite light is a luminous phenomenon that simulates natural light, and has become a common and important means of daily lighting in people's daily lives, such as backlights in LCD displays or indoor / street lighting. Generally speaking, commercialized electroluminescent white light is mainly realized by covering the blue light chip with yellow phosphor, but its color rendering index is low and the luminous efficiency is low. There are two main ways to achieve white light, one is the mixing of the three primary colors of red, green and blue, and the other is direct single emission of white light. [0003] At present, the external quantum efficiency of red and green perovskite light-emitting diodes exceeds 20%, and the efficiency of blue l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/16C01G21/00C09K11/66
CPCC01G21/16C01G21/006C09K11/665C01P2004/03C01P2002/72C01P2004/62Y02B20/00
Inventor 陈嘉伟曾海波李晓明宋继中魏昌庭
Owner NANJING UNIV OF SCI & TECH
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