Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 662, Issue -, Pages 232-239Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.12.075
Keywords
Photoluminescence; Red phosphor; White LED; Mn4+
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Funding
- Zhejiang Province Natural Science Foundation of China [LQ14E020006, LQ13E020003]
- Natural Science Foundation of Zhejiang for Distinguished Young Scholars [LR15E020001]
- 151 talent's projects in the second level of Zhejiang Province
- National Nature Science Foundation of China [21271170, 61372025, 51372172, 51502066, 51572065]
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Mn4+-activated fluoride compounds, emerging as highly efficient rare-earth-free red-emitting phosphors, have been regarded as excellent color converters for warm white-light-emitting diodes recently. In this paper, using a facile two-step co-precipitation approach, we report the synthesis and structure of a novel ZnTiF6 center dot 6H(2)O:Mn4+ red-emitting phosphor as well as its optical performance in detail. Particularly, the as-prepared yellowish ZnTiF6 center dot 6H(2)O:Mn4+ powders exhibit an intense narrow-band Mn4+ E-2(g) -> (4)A(2g) red emission with internal quantum efficiency of 26.4% upon the excitation of blue light corresponding to (4)A(2g) -> T-4(2g) transitions of Mn4+. As a consequence, the warm white-light-emitting diodes with tunable correlated color temperature and color rendering index can be easily realized by combining ZnTiF6 center dot 6H(2)O:Mn4+ red phosphor with commercial YAG:Ce3+ yellow phosphor on the blue-InGaN chip. (C) 2015 Elsevier B.V. All rights reserved.
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