Method for preparing white fluorescent quantum dot composite particles by microfluid method

Abstract

The invention relates to a quantum dot composite particle material capable of emitting white fluorescence and a preparation method thereof. Fluid which contains red, green and blue three-color quantum dots and a polymerizable component which are mixed according to a ratio are injected into a channel of a microfluid device; the fluid is gathered into a water phase solution which contains a surfactant and a photoinitiator at an opening of the channel, so that liquid drops are formed and are suspended in the water phase; the polymerizable components in the liquid drops are irradiated by ultraviolet to realize photopolymerization under the action of the photoinitiator; the quantum dot composite particle capable of emitting the white fluorescence can be obtained by polymerization curing. The quantum dot composite particle material prepared by the preparation method disclosed by the invention has a controllable particle size and a uniform size and is high in quantum efficiency; the stability of quantum dots are high in stability; meanwhile, the preparation method is simple and is favorable for batch production.

Description

technical field [0001] The invention relates to the manufacturing field of quantum dot backlight source technology, in particular to a preparation method of a quantum dot particle material capable of emitting white fluorescence. Background technique [0002] As the performance of monochromatic OLEDs gradually matures, white organic light-emitting diodes (WOLED), as a new type of solid-state light source, has shown good application prospects in lighting and flat panel display backlight, and has attracted more and more people. more and more attention. The efficiency and performance of WOLEDs have been rapidly improved. But for WOLED light-emitting materials, the presence of impurities can lead to the quenching of excitons and the increase of device resistance, resulting in low light-emitting efficiency and short lifetime. The purification of organic materials occupies a considerable proportion in WOLED cost control. The preparation process is a vacuum evaporation process, t...

AI Technical Summary

Problems solved by technology

This method finally confines RGB three-color quantum dots in a spherical space. The preparation method is simple and easy to produce in batches, which solves the problems of poor stability and low quantum efficiency of quantum dot materials; at the same time, individual RGB composite particles can be As a white light emitting source, the light emitted by the combined white light emitting layer is uniform, and the preparation process of WOLED devices is simplified.

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