ELECTRON-PARAMAGNETIC-RESONANCE AND AN OPTICAL INVESTIGATION OF PHOTOREFRACTIVE VANADIUM-DOPED CDTE

Electron paramagnetic resonance (EPR), photo-EPR, optical absorption, and photoluminescence measurements have been made on photorefractive v anadium-doped CdTe. This EPR observation of the V3+ ion in CdTe, along with the observed features assigned to V2+ in the optical-absorption spectrum, provide direct evidence for the substitutional incorporation of vanadium. Photo-EPR measurements were also conducted and provide d irect evidence for the optical activity of V3+ under sub-band-gap illu mination. A qualitative discussion linking these observations to photo ionization channels is presented.