title: Domination of second-sphere shrinkage effect to improve photoluminescence of red nitride phosphors.
abstract: Red Ca0.99Al(1-4δ/3-x)Si(1+δ+x)N(3-x)C(x):Eu(2+)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 Ca0.99Al(1-4δ/3-x)Si(1+δ+x)N(3-x)C(x):Eu(2+)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 Si(4+) for large Al(3+) 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 (29)Si solid-state NMR techniques.
authors.affiliation: Department of Chemistry, National Taiwan University , Roosevelt Road, Sec. 4, Taipei 106, Taiwan.
authors.forename: Wan-Yu
authors.initials: WY
authors.lastname: Huang
authors.forename: Fumitaka
authors.initials: F
authors.lastname: Yoshimura
authors.forename: Kyota
authors.initials: K
authors.lastname: Ueda
authors.forename: Wei Kong
authors.initials: WK
authors.lastname: Pang
authors.forename: Bing-Jian
authors.initials: BJ
authors.lastname: Su
authors.forename: Ling-Yun
authors.initials: LY
authors.lastname: Jang
authors.forename: Chang-Yang
authors.initials: CY
authors.lastname: Chiang
authors.forename: Wuzong
authors.initials: W
authors.lastname: Zhou
authors.forename: Nguyen Hoang
authors.initials: NH
authors.lastname: Duy
authors.forename: Ru-Shi
authors.initials: RS
authors.lastname: Liu