期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 356, 期 4-5, 页码 236-243出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2009.11.010
关键词
Optical properties; Luminescence; Optical spectroscopy; Oxide glasses; Rare-earths in glasses
资金
- Pukyong National University
- Korea government (Ministry of Education, Science and Technology MEST) [2009-0078682]
- Ministerio de Educacion y Ciencia (Spain) [MAT2007-65990-C03-02, PCI2006-A7-0638]
- EU
- National Research Foundation of Korea [핵06B2812, 2009-0078682] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Dysprosium-doped oxyfluoride glasses and nanocrystalline glass-ceramics have been synthesized and studied by X-ray diffraction, transmission electron microscope, optical spectroscopy and time-resolved decay curves measurements. From the absorption spectra, Judd-Ofelt intensity parameters have been obtained and are used to predict radiative properties for the excited states of Dy3+ ions. From the visible emission spectra, yellow to blue intensity ratios have been calculated and their relative variations have been discussed based on the concentration of Dy3+ ions and the heat treatment conditions used to prepare the glass-ceramics. Luminescence decay curves of the F-4(9/2) emitting level are found to be single exponential for 0.01 mol% Dy3+-doped glass and non-exponential for the remaining samples. The nature of energy transfer processes between Dy3+ ions, responsible for the non-exponential behavior of the decay curves, has been analyzed in the frame work of the Inokuti-Hirayama model. Lifetimes of the F-4(9/2) level are found to decrease with the concentration of Dy3+ ions as well as with the time of heat treatment. (C) 2009 Elsevier B.V. All rights reserved.
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