Method for preparing full-inorganic perovskite quantum dots with high fluorescence quantum yield

A technology of fluorescence quantum yield and inorganic calcium, which is applied in the field of preparation of perovskite quantum dots, can solve the problems of inability to meet the application of optoelectronic functional materials, and achieve the effects of simple preparation method, good stability and high performance

Inactive Publication Date: 2019-05-21
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, there is a lot of room for improvement in the performance of halogen perovskite quantum dot materials. CsPbX prepared by traditional thermal injection method 3 Perovskite quantum dots, especially CsPbCl 3 and CsPbI 3 Due to the low PLQY, it is still far from satisfying the application in optoelectronic functional materials

Method used

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  • Method for preparing full-inorganic perovskite quantum dots with high fluorescence quantum yield
  • Method for preparing full-inorganic perovskite quantum dots with high fluorescence quantum yield
  • Method for preparing full-inorganic perovskite quantum dots with high fluorescence quantum yield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: use KBr solution to CsPbBr 3 The preparation method for post-processing is as follows:

[0018] (1) Add 5 mL of octadecene (ODE), 313 μL of oleic acid (OA), 0.101 g of cesium carbonate (CsCO 3 ), heated to 120°C and vacuumed for 30min, N 2 Stir at 150°C under atmosphere until the solution becomes clear;

[0019] (2) In a 25mL three-necked flask, add 20mL of octadecene (ODE), 2mL of oleylamine (OAm), 2mL of oleic acid (OA), 0.276g of lead bromide (PbBr 2 ), heated to 120°C, vacuumed for 30 minutes, and then passed nitrogen for 10 minutes, repeated three times, and the temperature was raised to 160°C when passing nitrogen for the last time;

[0020] (3) Take 1.6 mL of Cs-oil in step (1), quickly inject it into the system of step (2), react for 5 seconds, and immediately put it into an ice-water bath;

[0021] (4) Take 5mL of the solution after the reaction in step (3), centrifuge at 11000r / min for 5min, discard the supernatant, add 5mL of n-hexane, centr...

Embodiment 2

[0024] Example 2: Using CdBr 2 solution to CsPbBr 3 The preparation method for post-processing is as follows:

[0025] (1) Add 5 mL of octadecene (ODE), 313 μL of oleic acid (OA), 0.101 g of cesium carbonate (CsCO 3 ), heated to 120°C and vacuumed for 30 minutes, stirred at 150°C under a helium atmosphere until the solution became clear;

[0026] (2) In a 25mL three-necked flask, add 20mL of octadecene (ODE), 2mL of oleylamine (OAm), 2mL of oleic acid (OA), 0.276g of lead bromide (PbBr 2 ), heated to 120°C, vacuumed for 30 minutes, and then passed nitrogen for 10 minutes, repeated three times, and the temperature was raised to 160°C when passing nitrogen for the last time;

[0027] (3) Take 1.6 mL of Cs-oil in step (1), quickly inject it into the system of step (2), react for 5 seconds, and immediately put it into an ice-water bath;

[0028] (4) Take 5mL of the solution after the reaction in step (3), centrifuge at 11000r / min for 5min, discard the supernatant, add 5mL of n...

Embodiment 3

[0031] Embodiment 3: use the cadmium bromide solution of different concentrations to CsPbBr 3 The preparation method for post-processing is as follows:

[0032] (1) Add 5 mL of octadecene (ODE), 313 μL of oleic acid (OA), 0.101 g of cesium carbonate (CsCO 3 ), heated to 120°C and vacuumed for 30min, N 2 Stir at 150°C under atmosphere until the solution becomes clear;

[0033] (2) In a 25mL three-necked flask, add 20mL of octadecene (ODE), 2mL of oleylamine (OAm), 2mL of oleic acid (OA), 0.276g of lead bromide (PbBr 2 ), heated to 120°C, vacuumed for 30 minutes, and then passed nitrogen for 10 minutes, repeated three times, and the temperature was raised to 160°C when passing nitrogen for the last time;

[0034] (3) Take 1.6 mL of Cs-oil in step (1), quickly inject it into the system of step (2), react for 5 seconds, and immediately put it into an ice-water bath;

[0035] (4) Take 5mL of the solution after the reaction in step (3), centrifuge at 11000r / min for 5min, discard...

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Abstract

The invention discloses a method for preparing full-inorganic perovskite quantum dots with high fluorescence quantum yield. The method comprises the following steps of mixing octadecene, oleic acid and cesium carbonate, heating the mixture, performing vacuumizing, stirring the mixture in an inert gas atmosphere until the solution becomes clear, and then obtaining a solution A; mixing octadecene, oleylamine, oleic acid and lead bromide, heating the mixture, performing vacuumizing, repeatedly introducing inert gas, and raising the temperature to 160 DEG C during the last introduction of the inert gas to obtain a solution B; quickly injecting the solution A into the solution B, and immediately putting the mixed solution into an ice water bath after reaction is finished to prepare a solution C; centrifuging the solution C, decanting a supernatant, adding n-hexane, conducting centrifuging again, maintaining a supernatant, and adding n-hexane; adding deionized water into a mixture of a metalhalogen salt and oleamine to completely dissolve the mixture into a metal halogen salt solution, adding a cesium lead bromide perovskite quantum dot solution dispersed in n-hexane, stirring the mixture, and performing standing; obtaining an upper-layer solution and then completing the whole preparation process. The fluorescent quantum yield of the all-inorganic perovskite quantum dots prepared bythe method can reach 97.7% at most.

Description

technical field [0001] The invention relates to a method for preparing perovskite quantum dots, in particular to a method for preparing all-inorganic perovskite quantum dots with high fluorescence quantum yield. Background technique [0002] Halogen perovskite quantum dot materials have high fluorescence quantum efficiency, adjustable fluorescence wavelength, covering the entire visible light band, and narrow line width. In recent years, they have become one of the research hotspots in the field of semiconductor light-emitting, and are expected to be applied to the new generation of quantum dot display and lighting. in technology. However, there is a lot of room for improvement in the performance of halogen perovskite quantum dot materials. CsPbX prepared by traditional thermal injection method 3 Perovskite quantum dots, especially CsPbCl 3 and CsPbI 3 Due to the low PLQY, it is still far from satisfying the application in optoelectronic functional materials. Contents o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66C09K11/06B82Y20/00B82Y30/00B82Y40/00
Inventor 吕文珍陈润锋洪俊贤
Owner NANJING UNIV OF POSTS & TELECOMM
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