Browsing by Author "Zhou, WZ"

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    Domination of second-sphere shrinkage effect to improve photoluminescence of red nitride phosphors
    (ACS Publications, 2014-11-14) Huang, WY; Yoshimura, F; Ueda, K; Pang, WK; Su, BJ; Jang, LJ; Chiang, CY; Zhou, WZ; Duy, NH; Liu, RS
    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. © 2014, American Chemical Society.