cugas-zns core-shell quantum dot material and preparation method thereof

Abstract

The invention discloses a CuGaS-ZnS core-shell structure quantum-dot material and a preparation method thereof. The material is prepared from a copper-gallium-sulfur quantum-dot core and a zinc sulfide shell, wherein the zinc sulfide shell externally wraps the copper-gallium-sulfur quantum-dot core; a chemical molecular formula of the core is CuxGa1.33-0.33xS2; the diameter of the core is 2nm to 10nm; the shell thickness of the zinc sulfide shell is 0.3nm to 3nm. The method comprises the following steps of firstly mixing a copper source, a gallium source and a sulfur source, then putting in an inert atmosphere, heating, carrying out heat preservation, raising a temperature, reacting to obtain a CuGaS quantum-dot reaction solution, afterwards, injecting a zinc precursor solution into the CuGaS quantum-dot reaction solution, carrying out the heat preservation, then adding n-hexane and ethanol into an obtained mixture, agitating to obtain a turbid solution, and carrying out solid-liquid separation treatment on the turbid solution, so that a target product is prepared. A stimulated emission spectrum of the CuGaS-ZnS quantum-dot material reaches the wide wavelength range of 520nm to 620nm; further, the position of a light emission peak of an output spectrum is adjustable; the quantum efficiency of a quantum dot of yellow-green light at a position, which is 550nm of the light emission peak, is up to 75 percent; the CuGaS-ZnS quantum-dot material is enabled to be extremely easily, widely and commercially applied to the fields of photoluminescent devices and electroluminescent devices.

Description

technical field [0001] The invention relates to a quantum dot material and a preparation method thereof, in particular to a CuGaS-ZnS core-shell structure quantum dot material and a preparation method thereof. Background technique [0002] Quantum dots, also known as "nanocrystals", are quasi-zero-dimensional materials. Due to their special physicochemical properties, quantum dots are considered to be an excellent material for photoelectric sensing, luminescence, photoelectric conversion, and biological probes. [0003] Recently, people have made unremitting efforts to obtain solid-state light-emitting devices that emit white light, such as the title "Synthesis of highly white-fluorescent Cu–Ga–S quantum dots for solid-state lighting devices", Chem.Commun., 2016, 52, 709 (Synthesis of high-brightness white copper gallium sulfur quantum dots and preparation of solid-state light-emitting devices, "Chemical Communications" 2016, Vol. 52, p. 709). The solid-state light-emittin...

AI Technical Summary

Problems solved by technology

Although this product can realize the emission of white light, there are deficiencies in both the product and its preparation method. First, the white light emitted by the product is mainly composed of two indigo, 470nm and green, 567nm wavelengths. , and the luminescence peak of 470nm is stronger than that of 567nm, the two luminescence peaks appear at the same time and the positions cannot be adjusted; secondly, the preparation method cannot obtain products that emit white light in a wider range of wavelengths

Images