Quantum dot/polymer microsphere composite material, preparation method and application

Abstract

The invention relates to a quantum dot/polymer microsphere composite material. The material is characterized by comprising quantum dots and polymer microspheres, the polymer microspheres physically encapsulate the quantum dots, and the quantum dots are dispersed inside balls of the polymer microspheres. The invention also provides a preparation method and application of the quantum dot/polymer microsphere composite material. The material achieves the physical encapsulation protection of the quantum dots by the polymer microspheres, ensures the stability of the long-term use of the quantum dotsand the stability of the optical performance of a quantum dot backlight diaphragm as a whole, avoids the reduction or structural damage of the performance of the quantum dots caused by chemical changes, and ensures that the quantum dot luminescence efficiency and fluorescence efficiency of the quantum dot/polymer microsphere composite material are not affected.

Description

technical field [0001] The invention relates to the technical field of composite materials and their preparation, in particular to a quantum dot / polymer microsphere composite material, a preparation method and an application. Background technique [0002] Quantum dots are nanocrystals with a zero-dimensional structure composed of a small number of atoms. The general size does not exceed 10 nanometers. Due to the unique chemical and physical properties brought about by its ultra-small size, the nanomaterial has obtained extremely Big attention. For example, when quantum dots are excited by light or electricity of a specific energy, they will emit fluorescence at a certain frequency, and the wavelength of the fluorescence can be adjusted by changing its elemental composition and particle size. As a luminescent material, quantum dots have the characteristics of high fluorescence efficiency, narrow half-peak width, and wide color gamut. Due to such unique photoelectric propert...

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Problems solved by technology

The first method is to coordinate polymerizable monomers with quantum dots, and polymerize them on the surface of quantum dots to form a composite material coated with polymers on quantum dots, such as PCT patent application publication number WO2015184329A1, this method Although the degree of coating is relatively high, the chemical environment in the preparation process is complex, and it is necessary to synergistically introduce initiators, monomers, catalysts, and temperature rises around the quantum dots, which will cause a decrease in quantum fluorescence efficiency; another method is to contain polymers. The precursor of quantum dots is added to the solution of the carrier, and the polymer is used as a ligand, and then the quantum dots are synthesized to realize the coating of the quantum dots by the polymer

In order to adapt to the synthesis of quantum dots, this method has high requirements on the polymer carrier, and at the same time it is difficult to control the particle size of quantum dots, and it is difficult to achieve the optimal optical parameters.

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