Journal
JOURNAL OF LUMINESCENCE
Volume 137, Issue -, Pages 173-179Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2012.12.053
Keywords
CaAlSiN3; Crystal structure; Luminescence; Blue shift
Categories
Funding
- National Natural Science Foundation of China [90922027, 51272027]
- Ph.D. Programs Foundation of Education Ministry of China [20100006110011]
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A series of phosphors, Eu-doped Ca(Al/Si)(2)N-2(N1-xOx), derivatives of CaAlSiN3, were synthesized by alloy-nitridation method. We demonstrated that their emission peaks can be tuned from 650 nm to 610 nm by oxygen preferential substitutions of nitrogen located at one of two crystallographic sites. Two luminesent centers corresponding to two types of Eu2+-coordination modes, i.e. (EuN2N3II)-N-I and (EuN2N2O)-N-I-O-II, were identified and accounted for the emission band structures, emission band shifts with oxygen/nitrogen substitutions, and the dependence of peak position and integrated emission intensity on temperature. As a typical example, Ca(Al/Si)(2)N-2(N0.80O0.20):0.02Eu showed intense orange-red emission peaking at 622 nm and kept the feature of excellent chemical stabilities, which would have potential applications in fabricating the white light-emitting diode. The excellent luminescent properties of these materials, such as wavelength-tunable red emission and excellent chemical stabilities, make them practical for use in typical LED package. (C) 2013 Elsevier B.V. All rights reserved.
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