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

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.

Keywords

Phosphors, Photoluminescence, Activation energy, Shrinkage, Energy conservation, Light emitting diodes

Citation

Huang, W.-Y., Yoshimura, F., Ueda, K., Pang, W. K., Su, B.-J., Jang, L.-Y., Chiang, C. Y., Zhou, W., Duy, N. H., & Liu, R.-S. (2014). Domination of Second-Sphere Shrinkage Effect To Improve Photoluminescence of Red Nitride Phosphors. Inorganic Chemistry, 53(24), 12822-12831. doi:10.1021/ic5017752