Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 139, Issue 1, Pages 314-318Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2013.01.042
Keywords
Optical materials; Sintering; Photoluminescence spectroscopy; Luminescence
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Funding
- National Natural Science Foundation of China [11204113]
- Foundation of Application Research of Yunnan Province [2011FB022]
- Chinese Specialized Research Fund for the Doctoral Program of Higher Education [20115314120001]
- Postdoctoral Science Foundation of China [2011M501424]
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A series of single-phased CaAl2Si2O8: Eu, Tb phosphors have been synthesized at 1400 degrees C via a solid state reaction. The emission bands of Eu2+ and Eu3+ were observed in the air-sintered CaAl2Si2O8: Eu phosphor due to the self-reduction effect. Tb3+ ions that typically generated green emission were added in CaAl2Si2O8: Eu phosphor for contributing for a wider-range tunable emission. Energy transfer from Eu2+ to Tb3+ and the modulation of valence distribution of Eu2+/Eu3+ that contributes to the tunable color emitting were elucidated. More importantly, a white emission can be obtained by controlling the codoped contents of Li+ as well as suppressing the self-reduction degree of Eu. The white light emitting with the color coordinate (0.326, 0.261) was obtained, which indicates that CaAl2Si2O8: Eu, Tb is a promising tunable color phosphor for application in ultraviolet light emitting diodes (UV-LEDs). (C) 2013 Elsevier B.V. All rights reserved.
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