Journal
JOURNAL OF LUMINESCENCE
Volume 131, Issue 12, Pages 2463-2467Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2011.05.064
Keywords
Phosphor; Luminescence; Crystallographic sites; Sr3Al2O6; Eu2+; LED
Categories
Funding
- Natural Science Foundation of China [50672136]
- Natural Science Foundation of Guangdong Province [9151027501000047]
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Eu2+-doped Sr3Al2O6 (Sr3-xEuxAl2O6) was synthesized by a solid-state reaction under either H-2 and N-2 atmosphere or CO atmosphere. When H-2 was used as the reducing agent, the phosphor exhibited green emission under near UV excitation, while CO was used as the reducing agent, the phosphor mainly showed red emission under blue light excitation. Both emissions belong to the d-f transition of Eu2+ ion. The relationship between the emission wavelengths and the occupation of Eu2+ at different crystallographic sites was studied. The preferential substitution of Eu2+ into different Sr2+ cites at different reaction periods and the substitution rates under different atmospheres were discussed. Finally, green-emitting and red-emitting LEDs were fabricated by coating the phosphor onto near UV- or blue-emitting InGaN chips. (C) 2011 Elsevier B.V. All rights reserved.
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