Abstract
In addition to the V3+ features earlier identified, photoluminescence (PL) excitation and sensitization spectra support the assignment of infrared PL bands to internal transitions of V+ and V2+ in vanadium-doped CdTe. The measured decay time constants of the PL bands conform to the electric-dipole selection rules. Crystal-field calculations applying a Tanabe-Sugano scheme support the assignment of excited states. In addition to the charge-conserving transitions of vanadium ions in their various oxidation states, charge-transfer transitions are present in the spectra. A comparative analysis of intrinsic defect levels reveals that they are not involved in the experimental spectra. From the excitation and sensitization spectra, the positions of the V2+/V3+ donor (ECB-7550 cm-1) and V2+/V+ acceptor (ECB-4800 cm-1) levels in CdTe are determined.
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