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 language | English |
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Pages (from-to) | 12822-12831 |
Number of pages | 10 |
Journal | Inorganic Chemistry |
Volume | 53 |
Issue number | 24 |
Early online date | 19 Nov 2014 |
DOIs | |
Publication status | Published - 15 Dec 2014 |
Keywords
- Light-emitting-diodes
- Color rendering index
- Luminescence properties
- White leds
- Oxynitride
- Lattice
- SR