High-stability perovskite quantum dot composite material and preparation method thereof

A composite material and quantum dot technology, which is applied in the field of perovskite quantum dot composite material Al2O3/CsPbX3 and its preparation, can solve the lack of detailed research on the stability improvement mechanism of semi-bare QDs and hinder the charge transfer of perovskite QDs and other semiconductors , affect photoelectric applications and other issues, to achieve the effect of highlighting water stability and thermal stability, excellent stability, and excellent luminous performance

Active Publication Date: 2019-12-13
HUNAN NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these strategies are far from perfect, and the potential disadvantages include: limited stability improvement, sacrificial PLQY, insulating protective shell, which will hinder the charge transfer between perovskite QDs and other semiconductors, and ultimately affect their optoelectronic performance. application
However, there is a lack of detailed studies on the stability improvement mechanism of semi-bare QDs

Method used

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  • High-stability perovskite quantum dot composite material and preparation method thereof
  • High-stability perovskite quantum dot composite material and preparation method thereof
  • High-stability perovskite quantum dot composite material and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0025] Example 1: Preparation of Al 2 O 3 / CsPbCl 1.5 Br 1.5 Composite materials.

[0026] S1: 0.267g Cs 2 CO 3 , 10ml octadecene and 1ml oleic acid are placed in a 50ml three-necked flask. Under stirring at room temperature, pass 10 min N 2 Then the temperature was raised to 120°C and degassed under vacuum for about 1 hour until no bubbles were generated. Then, enter N again 2 , While heating to 150℃, wait for Cs 2 CO 3 After dissolving completely, cool to room temperature naturally. Since cesium oleate will precipitate out of octadecene at room temperature, it needs to be preheated to 100°C during use.

[0027] S2: Add 0.188 mmol PbCl 2 , 0.188 mmol PbBr 2 And 10 ml octadecene in a 50 ml three-necked flask. Under stirring at room temperature, pass 10 min N 2 Then the temperature was raised to 120°C and degassed under vacuum for about 1 hour until no bubbles were generated. Then, enter N again 2 , Inject 1 ml each of oleic acid and oleylamine. PbCl 2 And PbBr 2 After completel...

example 2

[0032] Example 2: Preparation of Al 2 O 3 / CsPbBr 3 Composite materials.

[0033] S1: 0.267g Cs 2 CO 3 , 10 ml octadecene and 1 ml oleic acid are placed in a 50 ml three-necked flask. Under stirring at room temperature, pass 10 min N 2 Then the temperature was raised to 120°C and degassed under vacuum for about 1 hour until no bubbles were generated. Then, enter N again 2 , While heating to 150℃, wait for Cs 2 CO 3 After dissolving completely, cool to room temperature naturally. Since cesium oleate will precipitate out of octadecene at room temperature, it needs to be preheated to 100°C during use.

[0034] S2: Add 0.376 mmol PbBr 2 And 10 ml octadecene in a 50 ml three-necked flask. Under stirring at room temperature, pass 10min N 2 Then the temperature was raised to 120°C and degassed under vacuum for about 1 hour until no bubbles were generated. Then, enter N again 2 , Inject 1 ml each of oleic acid and oleylamine. PbBr 2 After it is completely dissolved, the temperature is ...

example 3

[0039] Example 3: Preparation of Al 2 O 3 / CsPbBr 1.2 I 1.8 Composite materials.

[0040] S1: 0.267 g Cs 2 CO 3 , 10ml octadecene and 1ml oleic acid are placed in a 50ml three-necked flask. Under stirring at room temperature, pass 10 min N 2 Then the temperature was raised to 120°C and degassed under vacuum for about 1 hour until no bubbles were generated. Then, enter N again 2 , While heating to 150℃, wait for Cs 2 CO 3 After dissolving completely, cool to room temperature naturally. Since cesium oleate will precipitate out of octadecene at room temperature, it needs to be preheated to 100°C during use.

[0041] S2: Add 0.150 mmol PbBr 2 , 0.226 mmol PbI 2 And 10 ml octadecene in a 50 ml three-necked flask. Under stirring at room temperature, pass 10 min N 2 Then the temperature was raised to 120°C and degassed under vacuum for about 1 hour until no bubbles were generated. Then, enter N again 2 , Inject 1 ml each of oleic acid and oleylamine. PbBr 2 And PbI 2 After completely ...

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Abstract

The invention discloses a high-stability perovskite quantum dot composite material Al2O3/CsPbX3 (wherein X is selected from the group consisting of Cl, Br, I, Cl/Br and Br/I) and a preparation methodthereof. According to the invention, Al2O3 is used as a matrix; Al2O3 and a quantum dot raw material may be added into a reactor together before quantum dot synthesis, or Al2O3 may be added into a synthesized quantum dot solution system; stirring is performed at room temperature to enable quantum dots to be fully adsorbed on the surface of Al2O3, then a mixed solution is centrifugally separated, an obtained precipitate is washed with methyl acetate or ethyl acetate, and then centrifugation is carried out again; and finally, the precipitate is dried to obtain the Al2O3/CsPbX3 composite material. The method is simple to operate, has good market value and is easy to promote. After the Al2O3/CsPbBr3 composite material is soaked in distilled water for two months, the Al2O3/CsPbBr3 composite material still emits strong fluorescence under the excitation of ultraviolet light. In addition, the thermal stability of the Al2O3/CsPbX3 composite material is also obviously superior to the thermal stability of CsPbX3 quantum dots. Such results show that the stability of the perovskite quantum dots is obviously improved as the perovskite quantum dots are adsorbed on the surface of Al2O3.

Description

Technical field [0001] The invention relates to the field of materials science, and more specifically to a highly stable perovskite quantum dot composite material Al 2 O 3 / CsPbX 3 (X = Cl, Br, I, Cl / Br and Br / I) and its preparation methods. Background technique [0002] In recent years, among various optoelectronic materials, perovskite quantum dots have come to the fore with their excellent performance. Compared with organic-inorganic hybrid perovskite quantum dots, all-inorganic perovskite quantum dots (IPQDs) are more stable. IPQDs have attracted much attention because of their high light absorption coefficient, narrow emission spectrum, high photoluminescence quantum yield (PLQY), adjustable composition and size, adjustable emission spectrum, and photoluminescence and electroluminescence. These characteristics make it one of the most promising photoelectric materials, which are widely used in light-emitting diodes (LEDs), solar cells, photodetectors, lasers and other fields...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66C09K11/02B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/025C09K11/665
Inventor 周文理王恩胜廉世勋张瑞勤
Owner HUNAN NORMAL UNIVERSITY
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