Journal
OPTICAL MATERIALS
Volume 32, Issue 9, Pages 913-919Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2010.01.023
Keywords
Upconversion luminescence; Eu3+ ion; Yb3+ ion; Energy transfer; Oxyfluoroborate glass; Rare earth; Glass ceramic; BaB4O7 crystal
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Funding
- Council of Scientific and Industrial Research, Government of INDIA
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The spectroscopic and structural properties of surface crystallized Eu3+ ions and Yb3+ ions co-doped oxyfluoroborate glass ceramics have been studied. Luminescence measurements reveal higher cross-sections in the ceramic, on excitation with 464 nm and 976 nm laser radiations. Studies with polarized light as well as SEM images confirm crystallization in the ceramic and the XRD studies show that alpha-BaB4O7 crystals are formed on the surface after annealing. These structural changes significantly alter the luminescence characteristics of Eu3+ and Yb3+ ions. A bright red emission from Eu3+ ions is observed under 976 nm excitation. The photophysics involved in this emission has been explained. (C) 2010 Elsevier B.V. All rights reserved.
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