Color centers in gamma-irradiated YAP crystals grown by the Czochralski method

✍ Scribed by Dong, Yongjun ;Xu, Jun ;Zhou, Guoqing ;Zhao, Guangjun ;Su, Liangbi ;Xu, Xiaodong ;Li, Hongjun ;Si, JiLiang

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 187 KB
• Volume: 204
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200622098

✦ Synopsis

Abstract

Color centers in undoped YAP crystals induced by gamma‐irradiation were investigated by means of additional absorption spectra and thermal treatments. Color centers related to the 265 and 311 nm absorption bands were caused by Fe impurity ions and the charge state recharge of the Fe^3+^ and Fe^2+^ ions occurred during the gamma‐irradiation process. Gamma‐irradiation and air annealing affect the 400 nm AA (additional absorption) band intensity in an opposite way and (V~c~^–^–F^+^) defects should be responsible for this band. Further air and hydrogen annealing of un‐irradiated YAP shows that color centers at 193 nm may be associated with V~c~ defects. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)