期刊
JOURNAL OF LUMINESCENCE
卷 130, 期 1, 页码 163-167出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2009.08.007
关键词
Europium; Nanoparticles; Photoluminescence; Silver; Tin; X-ray spectroscopy
类别
资金
- Alliance for Graduate Education
- Professoriate (AGEP) 2008-2009 Research Fellowship [0302696]
- UPR-M DoE-SR 2008 Research Scholarship
- Alfred P. Sloan Foundation
Europium-doped aluminophosphate glasses prepared by the melt-quenching technique have been studied by photoluminescence (PL) and X-ray photoelectron spectroscopy (XPS). The effects of silver and tin doping, and of further thermal processing on Eu3+ ions luminescence have been assessed. For the glass system containing only europium, Eu3+ PL observed under UV excitation is suggested to occur through energy transfer from the excited glass host. After silver and tin doping, an enhanced UV excited Eu3+ PL has been indicated to occur essentially due to radiative energy transfer from isolated Ag+ ions and/or two fold-coordinated Sn centers. Since thermal processing of the material leads to a quenching effect on Eu3+ PL and Ag nanoparticles (NPs) formation due to reduction of silver ions by tin, XPS was employed in order to investigate the possibility for Eu3+ -> Eu2+ reduction during HT as a potential source of the PL decrease. The data points towards Ag NPs as main responsible for the observed weakening of Eu3+ PL (C) 2009 Elsevier B.V. All rights reserved.
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