Cathodoluminescence of Cd4SiS6, Cd4SiSe6, and Si-doped CdS, CdSe, and CdTecrystals

CdS, CdSe, and CdTe single crystals were vapor-phase-doped with the corresp onding silicon chalcogenides under nearly equilibrium conditions. Cathodolu minescence studies revealed that the Si dopant produced new luminescence ce nters in the crystals. The cathodoluminescence spectra of Cd4SiS6 and Cd4Si Se6 crystals were measured. Metastable, sphalerite CdS < Si > and CdSe < Si > films were grown under highly nonequilibrium conditions. The maximum of edge emission in their spectra was redshifted as compared to the stable mat erials. The CdS < Si > and CdSe < Si > crystals were shown to be photosensi tive.