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Composition Effects on Optical Properties of Tb 3+ ‐Doped Heavy Germanate Glasses
Author(s) -
Chen Guorong,
Yang Yunxia,
Zhao Donghui,
Xia Fang,
Baccaro Stefania,
Cecilia Angelica,
Nikl Martin
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00075.x
Subject(s) - radioluminescence , terbium , germanate , devitrification , doping , analytical chemistry (journal) , materials science , luminescence , ion , mineralogy , nuclear chemistry , chemistry , crystallization , optics , scintillation , physics , optoelectronics , organic chemistry , chromatography , detector
A group of terbium‐doped heavy germanate glasses were studied. Glass matrices contained GeO 2 , Gd 2 O 3 , BaO, and/or La 2 O 3 with the Tb 3+ doping concentration ranging from 1 to 5 mol%. The transmission and radioluminescence spectra were measured and their correlations with glass composition are discussed. It is found that the UV cut‐off edge of glass matrices is related to the content of the network modifier BaO as well as to the mixed rare earths effect, while the concentration of trapping sites existing in the glass network is essential to the radioluminescence properties of the glass. The latter is also associated with the content of the network modifier BaO that produces unsaturated nonbridging oxygens in the glass lattice. Another important mechanism influencing the luminescence process involves the enhanced energy transfer from Gd 3+ ions to Tb 3+ emission centers. A self‐sensitizing effect of Tb 3+ is observed in the Tb 3+ concentration range studied, which contributes to some extent to the enhanced Tb 3+ green emission. La 2 O 3 additions to the host glass play an active role of partitioning Tb 3+ in the glass matrix, thereby showing an enhanced blue emission because of the reduced cross‐relaxation probability between Tb 3+ cations.