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27. ChemInform Abstract: Synthesis and Optical Performance of a New Red-Emitting ZnTiF6·6H2O:Mn4+Phosphor for Warm White-Light-Emitting Diodes

Author

Zhenguo Ji, Leifeng Chen, Chen Daqin, Hua Yu, Xin Wang, Weidong Xiang, and Jiasong Zhong

Subjects
Materials science, business.industry, Phosphor, General Medicine, Color temperature, Color rendering index, Optics, White light, Optoelectronics, Quantum efficiency, business, Excitation, Diode, Blue light
Abstract

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 ZnTiF6·6H2O:Mn4+ red-emitting phosphor as well as its optical performance in detail. Particularly, the as-prepared yellowish ZnTiF6·6H2O:Mn4+ powders exhibit an intense narrow-band Mn4+ 2Eg → 4A2g red emission with internal quantum efficiency of 26.4% upon the excitation of blue light corresponding to 4A2g → 4T2g 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 ZnTiF6·6H2O:Mn4+ red phosphor with commercial YAG:Ce3+ yellow phosphor on the blue-InGaN chip.

Published
2016

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