期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 41, 页码 16379-16384出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm11601k
关键词
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资金
- National Nature Science Foundation of China [10834006, 10904141, 10904140, 51172226]
- MOST of China [2010AA03A404]
- Scientific project of Jilin province [20090134, 20090524]
- CAS
We report luminescence properties of Ce3+ and Mn2+ co-activated Ca3Sc2Si3O12 (CSS) silicate garnets. It is observed that Mn2+ may not only occupy Ca2+ sites to generate a yellow emission (Mn2+(I)) at 574 nm but also Sc3+ sites to generate a red emission (Mn2+(II)) at 680 nm. Considerable Mn2+ substitution for Sc3+ can be performed through balancing their charge difference by introducing a trivalent rare earth ion, such as La3+ and Ce3+, to replace Ca2+. Meanwhile, remarkable energy transfer from the green emitting Ce3+ to both Mn2+(I) and Mn2+(II) can occur, making tunable color and white light emission available in CSS: Ce3+, Mn2+ upon blue excitation into Ce3+. White LEDs combined by CSS: Ce3+, Mn2+ phosphors and blue LED chips are fabricated. A CSS: 0.03Ce(3+), 0.2Mn(2+) phosphor with deficient red emission is enriched in red by increasing Ce3+ concentration to 0.1, which leads to increase of Mn2+(II) number in case of charge compensation by more Ce3+ ions. Consequently, the color rendering index of the white LEDs is improved from 64 to 76. The results of this work indicate that CSS: Ce3+, Mn2+ garnet could be a promising single phase phosphor for white LEDs.
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