Journal
MATERIALS RESEARCH BULLETIN
Volume 47, Issue 12, Pages 4071-4075Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2012.08.057
Keywords
Optical materials; Chemical synthesis; Electron microscopy; Luminescence
Categories
Funding
- National High-Tech R&D Program of China (863 program)
- National Natural Science Foundation of China [51002043, 51172086, 61076040]
- Science Foundation for Excellent Young Scholars of the Ministry of Education of China [20090111120001]
- Postdoctoral Science Foundation of China [20090450802]
- Hefei University of Technology [XS11121]
- National Science Council of Taiwan [NSC 97-2113-M-002-012-MY3, NSC 100-2120-M-002-008]
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New phosphors are desired to overcoming the flickering luminescence of alternating current light-emitting diodes (AC-LEDs) by compensating dark duration with appropriately persistent luminescence. Here, the phosphor of SrAl2O4:Eu2+,Ce3+,Li+ was developed for this application. The phosphor was synthesized with solid-state reaction method by using H3BO3 as flux. The XRD patterns show that the impurity phase of Sr4Al14O25 which always formed together with SrAl2O4 during reaction was suppressed by using Ce. The charger defects caused by the non-equivalent substitution of Sr2+ with Ce3+ were compensated with Li+. Thus, the luminescence intensity of SrAl2O4:Eu2+ was enhanced significantly by co-doping Ce3+ and Li+ The fluorescence lifetime of the phosphor is about 36.5 ms. The energy dispersive spectra (EDS) assisted with scanning electron microscope (SEM) pictures reveal that Ce ions mainly distribute along grain boundary. (C) 2012 Elsevier Ltd. All rights reserved.
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