In this study, we investigated the microstructural and luminescence characteristics of high-linearity ZnS:Cu 2+ ,Cl − phosphor. Through conducting the method of high-temperature solid state reaction, we prepared the ZnS phosphors characterizing with two different doping concentrations of Cu 2+ ions. The prepared two kinds of ZnS phosphors exhibit two coexisting forms of cubic phase and hexagonal phase, to which the concentration of Cu 2+ imposes no influence on the microstructure of the phosphor. The average particle size is 2.68 ± 0.5 μm and the emission wavelength locating at approximate 460 nm attribute to the zinc vacancy. As the concentration of the Cu 2+ ions increases, the energy bandgap, the fluorescence lifetime and the luminescence intensity decrease, causing noticeable concentration quenching. In addition, the linear correlation between the emission intensity and the current of the prepared phosphors is stronger than that of commercial ones. The prepared ZnS:Cu 2+ ,Cl − phosphor with high linearity and short fluorescence lifetime has great potential to be applied in practical applications in the field of high-energy physics and astrophysical exploration.
The ability to control dopants and defects, as well as the core/shell structures, of quantum dots (QDs) is an essential nanotechnology to modify and optimize their photoluminescence properties. Herein, the optimized ZnS:Mn2+/ZnS/ZnS:Cu2+/ZnS core/multishell QDs have been prepared, and their luminescence properties depending on the ratios of the starting materials and the injection temperature of an extra sulfur source were discussed; finally the white light can be possibly obtained by mixing the blue light (emission peak at 450 nm originating from Cu2+ dopants or emission peaks at 405 and 430 nm corresponding to a defect emission center) and orange light (emission peak at 585 nm from Mn2+ dopants). As a controlled synthesis comparison, the optimum core/shell structures and key synthesis parameters have been determined, and the quantum yield (QY) of the as-obtained ZnS:Mn2+/ZnS/ZnS:Cu2+/ZnS core/multishell white light emitting QDs without defect emission was determined to be 38%. The practical white light device prototype has been also fabricated and the CIE color coordinate of (0.32, 0.34) with a warm white light has been realized upon the excitation of the commercial 370 nm UV LED chip, which demonstrated potential application for micro/nano optical functional devices.
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