Domination of Second-Sphere Shrinkage Effect To Improve Photoluminescence of Red Nitride Phosphors
Journal
Inorganic Chemistry
Journal Volume
53
Journal Issue
24
Pages
12822-12831
Date Issued
2014
Author(s)
Huang, Wan-Yu
Yoshirnura, Fumitaka
Ueda, Kyota
Pang, Wei Kong
Su, Bing-Jian
Jang, Ling-Yun
Chiang, Chang-Yang
Zhou, Wuzong
Nguyen Hoang, Duy
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.
SDGs
Type
journal article