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

Wan-Yu Huang, Fumitaka Yoshirnura, Kyota Ueda, Wei Kong Pang, Bing-Jian Su, Ling-Yun Jang, Chang-Yang Chiang, Wuzong Zhou, Nguyen Hoang Duy, Ru-Shi Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)12822-12831
Number of pages10
JournalInorganic Chemistry
Volume53
Issue number24
Early online date19 Nov 2014
DOIs
Publication statusPublished - 15 Dec 2014

Keywords

  • Light-emitting-diodes
  • Color rendering index
  • Luminescence properties
  • White leds
  • Oxynitride
  • Lattice
  • SR

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