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Spectroscopic characterization of Ti-doped α-ZnAl2S4 spinel-type single crystals
Sergiu Anghel1, Georges Boulon, Alain Brenier
1Institute of Applied Physics, Academiei Street 5, Chisinau MD-2028, Republic of Moldova. anggell@gmail.com
Abstract:
The spectroscopic characteristics of the α-ZnAl(2)S(4) wide bandgap semiconductor doped with Ti ions are investigated. It is shown, that the ZnAl(2)S(4):Ti spinel-type crystals exhibit luminescence in the IR spectral range 0.8-1.4 µm. The observed spectroscopic characteristics are assigned to the emission bands arising from the ligand -Ti(4+) charge transfer for octahedral sites of titanium that is in agreement with the experimental evidence for the absence of the EPR signal from Ti ions. A qualitative explanation of the experimental data is given.
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