Optical and photoelectrical studies of charge-transfer processes in YAlO{sub 3}:Ti crystals
- A. F. Ioffe Physicotechnical Institute, Academy of Sciences of Russia, 194021, St. Petersburg (Russia)
- Institut fuer Laser-Physik, Universitat Hamburg, Jungiusstrasse 9a, D-20355 Hamburg (Germany)
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544 (United States)
The donor and acceptor charge-transfer transitions in YAlO{sub 3}:Ti{sup 3+}/Ti{sup 4+} were investigated through absorption, emission, excitation, one-photon and two-photon photoconductivities, excited-state absorption, and thermoluminescence. The results are contrasted to similar studies previously made on Al{sub 2}O{sub 3}:Ti{sup 3+}/Ti{sup 4+}. The dominant Ti{sup 3+} population has a photoionization threshold at 37000 cm{sup {minus}1}. The lowest energy Ti{sup 4+} charge-transfer transition has its zero-phonon energy near to 33900 cm{sup {minus}1}. The sum of these two quantities agrees with the reported band-gap energy of YAlO{sub 3}. The position of the Ti{sup 3+}/Ti{sup 4+} level in the band gap of YAlO{sub 3} is determined by these measurements. Stimulated emission from the {sup 2}{ital E} state of Ti{sup 3+} is limited by photoionization from this state. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 383240
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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