A method of obtaining formamidine lead bromide/pmma composite material by in-situ polymerization coating and its application

A technology of in situ polymerization, composite materials, applied in nanotechnology, luminescent materials, chemical instruments and methods for materials and surface science, etc., can solve the problem of quantum dot luminous efficiency decline, perovskite quantum dot agglomeration, limited commercial Chemical applications and other issues, to achieve the effects of excellent light transmittance and stability, excellent stability, and excellent mechanical properties

Active Publication Date: 2021-07-23
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The perovskite quantum dots prepared in this way often agglomerate, resulting in a decrease in the luminous efficiency of the quantum dots, and the spin-coating method limits its commercial application.
On the other hand, the current work is almost all devoted to CsPbBr quantum dots. However, the emission wavelength of CsPbBr QDs is usually at 515nm, although its wavelength can be shifted to the "greenest" band by changing its halogen content, but This will greatly reduce its luminous efficiency

Method used

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  • A method of obtaining formamidine lead bromide/pmma composite material by in-situ polymerization coating and its application
  • A method of obtaining formamidine lead bromide/pmma composite material by in-situ polymerization coating and its application
  • A method of obtaining formamidine lead bromide/pmma composite material by in-situ polymerization coating and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Synthesis and purification of formamidine lead bromine perovskite quantum dots

[0038] 1a. Synthesis of oleylamine bromide precursor

[0039] Use oleylamine and hydrobromic acid as raw materials, absolute ethanol as the reaction solvent, react in an ice bath under the protection of an inert gas for 8-12 hours, vacuum dry, wash with anhydrous ether and filter, vacuum dry, and grind to obtain oleylamine Bromine white powder. The volume ratio of oleylamine, hydrobromic acid and absolute ethanol is 5:4:10-100.

[0040] 1b. Synthesis of formamidine lead bromine quantum dots

[0041] Using oleic acid as a ligand, dissolve formamidine acetate and lead acetate in octadecene, heat the mixed solution to 50-80°C and vacuumize for 30 minutes; add the oleylamine bromide obtained in step 1a to toluene, heat to dissolve, and then Under nitrogen protection at 130°C, the toluene solution of oleylamine bromide was added to the reaction system of 1b. After reacting for 10 s...

Embodiment 2

[0045] Embodiment 2: preparation of formamidine lead bromine quantum dots and PMMA composite material

[0046] 2a. Preparation of mixed solution of formamidine lead bromine quantum dots and MMA

[0047] Take 40mg of the quantum dot powder in step 1c, put it into a glass container, add 10mL of MMA solution, make it fully contact and mix evenly through processes such as ultrasound and stirring, and seal it with a parafilm.

[0048] 2b. Illumination polymerization reaction of formamidine lead bromine quantum dots and MMA

[0049] The mixed solution in step 2a is placed under white light for light reaction, stirring continuously during the reaction, and the reaction is completed after 9-12 hours of reaction, and the solution becomes viscous.

Embodiment 3

[0050] Embodiment 3: preparation of formamidine lead bromine quantum dots / PMMA composite film

[0051] Pour the reacted solution in step 2b onto a smooth copper foil (the copper foil is fixed on the glass substrate), and use a spatula to evenly cover the reaction product on the copper foil, while the thickness of the film is controlled to 400um by the spatula. Place the glass substrate uniformly covered with the reaction product on a 60 °C heating plate to remove excess MMA monomer. After 2 minutes, take out the glass substrate, and use a cutting tool to cut out a green quantum dot composite film of an appropriate size.

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Abstract

The invention discloses a method for obtaining formamidine lead bromide / PMMA composite material by in-situ polymerization coating and its application. Firstly, high-quality formamidine lead bromide quantum dots are synthesized by a thermal injection process, and acetonitrile and toluene are used to Purify the quantum dots; secondly, mix the quantum dots and MMA solution in a certain proportion, react for a period of time under light conditions and polymerize to obtain a fluid product with a certain viscosity; finally, prepare a uniform green fluorescent film by scraping film method. The formamidine lead bromide / PMMA composite material of the invention can be used to construct white light LEDs. The invention can prepare formamidine lead-bromine quantum dot composite film material resistant to water and oxygen, and can obtain high-efficiency white light LED devices.

Description

technical field [0001] The invention relates to a method for compounding formamidine lead halide perovskite quantum dots with polymer monomers to prepare a uniform film, and using the quantum dot / polymer composite product as a luminescent material to construct an efficient white LED device Background technique [0002] Under the premise that the International Telecommunication Union proposed the new ultra-high-definition display standard Rec. Look for other luminescent materials (wavelength 525nm-535nm, half maximum width less than 25nm) to replace. Perovskite quantum dots have received extensive attention since they were reported by Kovaleno in 2015 due to their excellent properties such as high quantum yield, narrow half-peak width, strong light absorption ability, and tunable emission wavelength, and their luminescent properties have been continuously improved. and applied to optical devices. [0003] However, due to its ionic crystal properties, perovskite quantum dots...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/14C08F2/44C08F2/48C08K5/29C08J5/18C09D133/12C09D5/22C07C257/12C09K11/02C09K11/06B82Y20/00B82Y30/00B82Y40/00C08L33/12
CPCB82Y20/00B82Y30/00B82Y40/00C07C257/12C08F2/44C08F2/48C08F120/14C08J5/18C08J2333/12C08K5/29C09D5/22C09D133/12C09K11/025C09K11/06Y02B20/00
Inventor 蒋阳程敏杨苏鹏朱汉文李鹏程仲洪海
Owner HEFEI UNIV OF TECH
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