White Light Emission from ZnS:Mn Thin Films Deposited on GaN Substrates by Pulsed Laser Deposition

Abstract

ZnS:Mn thin films are grown on GaN substrates by pulsed laser deposition. The structure, morphology and optical properties are investigated by x-ray diffraction, scanning electron microscopy and photoluminescence (PL). The obtained ZnS:Mn thin films are grown in preferred orientation along 𝛽-ZnS (111) direction corresponding to crystalline structure of cubic phase. The deposition temperature has an obvious effect on the structure, surface morphology and optical properties of ZnS:Mn thin films. PL measurements show that there are two emission bands located at 440 nm and 595 nm when the films are deposited at temperatures from 100 ∘ C to 500 ∘ C. The relative integrated intensity of the blue emission and orange-red emission is determined by the deposition conditions. At the proper deposition temperature of 300 ∘ C, the color coordinate is closest to (0.33, 0.33). The ZnS:Mn films on GaN substrates can exhibit white light emission.

Growth and aggregation of Cu nanocrystals on ionic liquid surfaces*

“…[7][8][9][10] In theoretical research, a number of studies about the nucleation and aggregation of atoms and molecules on liquid surfaces have been performed so far and several interesting results have been obtained. [4,11,12] In order to fabricate various nanostructures, several growth methods can be adopted, such as sputter deposition, [13] thermal evaporation, [4] chemical etching, [9,14,15] laser ablation method, [16,17] inverse micelle method, [18] cold-wall physical vapor deposition (CWPVD), [19] etc. In most cases, the addition of stabilizing agents or catalysis is generally needed for preparing the nanostructures in different solutions.…”