Green Edge Emission in CdS

Abstract

The green edge emission has been studied in cadmium sulfide microcrystallites which deviate from stoichiometry or are doped with NaCl. The spectrum of CdS:S is composed of a doublet structure of emission series; one series beginning at 5147Å is dominant at 77°K and the other beginning at 5178Å is dominant at 4.2°K. The fluorescence in CdS:Cd is complicated. At 77°K, the spectrum is composed of two series of lines, the first series beginning at 5179Å and the second at 5239Å, so that the line structure is rather obscure. At 4.2°K, only the third series beginning at 5178Å appears. CdS: NaCl has two series of lines at 77°K beginning at 5162Å and at 5223Å. At 4.2°K the 5162Å series disappears, while the 5223Å series shifts to the higher energy side by 0.014 eV. The correlations between these emission series of lines and native defects of impurities are discussed.