Crystal growth and luminescence characteristics of powder electroluminescent materials

The effect of Cu~+ on the luminescence characteristics of ZnS: Cu electroluminescent materials was studied. The effects of burning temperature and flux on the structure, particle size and luminescence characteristics of luminescent materials were discussed. The luminescence properties of powder electroluminescent materials were improved by phase change technology and doping of two activators. The study shows that the luminance of the materials increases with the increase of the doping amount of Cu+. When the doping concentration of Cu+ is 0.15%, the luminance of the materials reaches the maximum, but the luminance does not increase with the increase of the doping concentration of Cu+. At the same time with the aid of photoluminescence spectrum further study the ZnS: administered luminescence mechanism and luminescence properties of Cu and Cu + concentration less than 0.15%, the photoluminescence spectrum peak increases gradually with the increase of concentration of Cu +, when Cu + concentration was 0.15%, the photoluminescence spectrum peak is at its maximum, Cu + concentration is greater than 0.15%, the photoluminescence spectrum peak began to drop quickly. By changing the burning temperature and the burning atmosphere to change the size of the crystal particle size, with the increase of the roasting temperature, the average particle size of ZnS: Cu increases, and the average particle size of 5/ b-22 / b-m luminescent materials can be obtained between 800℃ and 1250℃, and the luminescent materials’ brightness also tends to increase. Although the addition of flux Br- and Cl- has little effect on the particle size of luminescent materials, Br- and C1- play the role of charge compensation and can increase the solubility of Cu+ in crystal. Green luminescent materials with cubic phase structure, good crystallization and high brightness were obtained by using crystal phase change technology. In this paper, Cu+ and Au+ activators were added into ZnS matrix materials to explore a method to improve the luminescence performance of powder electroluminescent materials by changing the doping ratio. In ZnS crystals, they entered ZnS lattice in the form of monovalent cation to form more luminescent centers. By adding Cu+ and Au+ activators of different concentrations into the matrix ZnS material, the luminance of the electroluminescent material was greatly improved without affecting the color of the material. The completion of this paper is of important economic and practical significance for improving the luminescence characteristics of green ac powder electroluminescent material ZnS: Cu, obtaining high-quality ZnS: Cu green luminescent material and broadening the application field of the material.

Keywords related document search: optical engineering; ZnS; administered Electroluminescence; Crystal growth; Phase change; Luminous spectrum; Flux; activator.