期刊
OPTICAL MATERIALS
卷 18, 期 4, 页码 419-430出版社
ELSEVIER
DOI: 10.1016/S0925-3467(01)00182-3
关键词
terbium ions; phosphate glasses; irradiation; defects; optical absorption; electron spin resonance
The study of radiation-induced defect formation in glasses is of growing interest for applications in optics and photonics. The influence of Tb3+ ions on X-ray-induced defects has been examined in glasses with. different phosphate contents. The defects have been characterized by optical absorption and ESR spectroscopy. (Tb3+). ions are formed by X-ray irradiation. They exhibit a broad charge transfer band at 370 nm. The formation of (Tb3+)(+) hole centres suppresses the formation of intrinsic phosphate-related hole centres, absorbing in the visible region. PO3 defects absorbing in the ultraviolet region contribute mainly to the electron centres corresponding to the (Tb3+)(+) hole centres. Immediately after X-ray irradiation, 5-10% of the Tb3+ ions have been oxidized. The amount of (Tb3(+))(+) ions increases with increasing phosphate content. The stability of the (Tb3+)(+) ions at room temperature depends on glass composition and melting conditions. (C) 2002 Elsevier Science B.V. All rights reserved.
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