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Method for constructing high-stability perovskite quantum dot illuminant through in-situ polymerization

A technology of quantum dot luminescence and in-situ polymerization, applied in luminescent materials, chemical instruments and methods, nano-optics, etc., can solve the problems of difficulty in making large volumes and high preparation costs

Pending Publication Date: 2021-09-14
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Inorganic scintillators are mostly inorganic salt crystals mixed with activators. This kind of scintillator is expensive to prepare and is mostly used in high-precision detection and high-energy detection; organic scintillators are mainly organic crystals such as anthracene, stilbene, and naphthalene. High fluorescence efficiency, but it is not easy to make a large volume, which also limits its application

Method used

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  • Method for constructing high-stability perovskite quantum dot illuminant through in-situ polymerization
  • Method for constructing high-stability perovskite quantum dot illuminant through in-situ polymerization
  • Method for constructing high-stability perovskite quantum dot illuminant through in-situ polymerization

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Preparation of perovskite quantum dot A(Cs) precursor: Take 2.498g of cesium stearate and dissolve in 21.8763g of oleic acid and 30.02g of octadecene, stir in a glove box at 150°C until completely dissolved, weigh 1.5g for later use .

[0024] 2) 10g lauryl methacrylate (LMA), 4.05g oleic acid, 3.6595g oleylamine, 0.297g PbBr 2 and 0.225g PbCl 2 Add it into a 100mL flask and stir, vacuumize and heat at 120°C under the protection of argon, then rapidly raise the temperature to 180°C to obtain a Pb precursor, heat 1.5g of the Cs precursor solution to 180°C and inject it into the Pb precursor, react Immediately after 5S, ice bath was carried out to obtain the stock solution of quantum dots emitting purple light.

[0025] 3) 9.44g methyl methacrylate (MMA) and 0.05g dibenzoyl peroxide (BPO) were stirred at 85°C for 13 minutes. When a large number of bubbles appeared in the solution, immediately take out the water bath and lower the temperature to below 40°C to obtain a...

Embodiment 2

[0028] 1) Preparation of perovskite quantum dot Cs precursor: 2.498g of cesium stearate was dissolved in 21.8763g of oleic acid and 30.02g of octadecene, stirred in a glove box at 150°C until completely dissolved, and 1.5g was weighed for later use.

[0029] 2) 10g lauryl methacrylate (LMA), 4.05g oleic acid, 3.6595g oleylamine, 0.4455g PbBr 2 and 0.1125g PbCl 2 Add it into a 100mL flask and stir, evacuate and heat at 120°C under the protection of argon, and then rapidly raise the temperature to 190°C to obtain a Pb precursor. Heat 1.5g of the Cs precursor solution to 180°C and inject it into the Pb precursor. Immediately after 5S, ice bath was carried out to obtain the stock solution of quantum dots emitting blue light.

[0030] 3) 9.44g methyl methacrylate (MMA) and 0.05g dibenzoyl peroxide (BPO) were stirred at 85°C for 13 minutes. When a large number of bubbles appeared in the solution, immediately take out the water bath and lower the temperature to below 40°C to obtain ...

Embodiment 3

[0033] 1) Preparation of Cs precursor: 2.498g of cesium stearate was dissolved in 21.8763g of oleic acid and 30.02g of octadecene, stirred in a glove box at 150°C until completely dissolved, and 1.8g was weighed for later use.

[0034] 2) 10g lauryl methacrylate (LMA), 4.05g oleic acid, 3.6595g oleylamine, 0.594g PbBr 2 Add it into a 100mL flask and stir, vacuumize and heat at 120°C under the protection of argon, then rapidly raise the temperature to 180°C to obtain a Pb precursor, heat 1.8g of the Cs precursor solution to 180°C and inject it into the Pb precursor, react Immediately after 5S, ice bath was carried out to obtain the stock solution of quantum dots emitting green light.

[0035] 3) 9.44g methyl methacrylate (MMA) and 0.05g dibenzoyl peroxide (BPO) were stirred at 85°C for 13 minutes. When a large number of bubbles appeared in the solution, immediately take out the water bath and lower the temperature to below 40°C to obtain a polymer polymer prepolymerization sys...

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Abstract

The invention discloses a method for constructing a high-stability perovskite quantum dot illuminant through in-situ polymerization, which comprises the steps of preparing a perovskite quantum dot stock solution by using a thermal injection method, and polymerizing quantum dots to prepare a photoluminescence block by using a high-molecular polymerization method, so that the stability of the quantum dots in air and water can be effectively improved, and the photoluminescence property of the prepared luminescent block is almost not reduced after the prepared luminescent block is stored in air for several months. Meanwhile, the perovskite quantum dots with different colors prepared from different raw materials can be effectively polymerized with polymer monomers in situ, so that the photoluminescence block with almost the whole visible light range from purple to near infrared is obtained.

Description

technical field [0001] The invention belongs to the field of quantum dot photoluminescence, and relates to a method for in-situ polymerization to construct a highly stable perovskite quantum dot luminescent body. Background technique [0002] Perovskite quantum dots prepared by traditional perovskite quantum dot preparation methods often cannot be stored in the air environment for a long time due to their poor stability, which severely limits the application of the prepared quantum dots. The perovskite quantum dots prepared by the hot injection method have the characteristics of high photoluminescence efficiency, uniform particle size, and good dispersion, but their stability is still poor, they cannot exist stably in water, and they will quickly fail in air. . Therefore, there is an urgent need for a method to stably preserve perovskite quantum dots so that they can exist stably in both water and air. [0003] Scintillators are important materials in modern science and te...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/66C08F292/00C08F220/18C08F220/14B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/025C09K11/665C08F292/00B82Y20/00B82Y30/00B82Y40/00C08F220/1812C08F220/14
Inventor 宋继中杨林翔王田田李金航李贤胜张百松赵永丽
Owner NANJING UNIV OF SCI & TECH
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