Domination of second-sphere shrinkage effect to improve photoluminescence of red nitride phosphors

RIS ID

97209

Publication Details

Huang, W., Yoshimura, F., Ueda, K., Pang, W., Su, B., Jang, L., Chiang, C., Zhou, W., Duy, N. & Liu, R. (2014). Domination of second-sphere shrinkage effect to improve photoluminescence of red nitride phosphors. Inorganic Chemistry, 53 (24), 12822-12831.

Abstract

Red Ca0.99Al1-4δ/3-xSi1+δ+xN3-xCx:Eu2+ 0.01 (δ = 0.345; x = 0-0.2) nitride phosphors exhibit a blue-shifted emission with increased eye sensitivity function and excellent thermal stability. The variations in the photoluminescence in the Ca0.99Al1-4δ/3-xSi1+δ+xN3-xCx:Eu2+ 0.01 (δ = 0.345; x = 0-0.2) system are thoroughly investigated. The enhanced emission energy and the improved thermal stability with increasing x are dominated by the second-sphere shrinkage effect via the substitution of small Si4+ for large Al3+ with simultaneous charge compensation. Related proofs of the second-sphere shrinkage effect control for photoluminescence are confirmed via high-resolution neutron powder diffraction, EXAFS, and 29Si solid-state NMR techniques.

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Link to publisher version (DOI)

http://dx.doi.org/10.1021/ic5017752