Ambient and high pressure spectroscopy of Ce3+ doped yttrium gallium garnet

作者：Wittlin, A.^*; Przybylinska, H.; Berkowski, M.; Kaminska, A.; Nowakowski, P.; Sybilski, P.; Ma, Chong-Geng; Brik, M. G.; Suchocki, A.

来源：Optical Materials Express, 2015, 5(8): 1868-1880.

DOI：10.1364/OME.5.001868

• LUMINESCENCE
• DEFECTS
• YAG
• STOICHIOMETRY
• SCINTILLATORS
• CRYSTALS
• LINES
• SHAPE

Low temperature infrared absorption in the region of intra-shell 4f-4f transitions of Ce3+ ions in bulk yttrium gallium garnet crystals reveals existence of different Ce3+ centers. In addition to the major center, related to Ce substituting yttrium, at least two other centers exist, most probably attributed to the rare-earth antisites, i.e. rare-earth ions at the Ga crystallographic positions. Temperature dependence of the visible absorption related to the 4f-5d transitions shows influence of thermal population of the second higher-lying level of the F-2(5/2) ground state, located 159 cm(-1) above the lowest level. 5d -> 4f luminescence of Ce3+ is observed at elevated pressure and shows signatures of pressure-induced crossing of the lowest 5d state of Ce3+ with the conduction band states.

• 出版日期2015-8-1
• 单位重庆邮电大学