Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 507, Issue 1, Pages 133-136Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.07.138
Keywords
Phosphor; SrWO4:Sm3+; Optical properties; White LEDs
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Funding
- National Natural Science Foundation of China [20771048, 20621091]
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A novel orange emissive phosphor, Sm3+-doped SrWO4, was synthesized by high temperature solid-state reaction in air atmosphere. The excitation spectra show that the phosphors can be efficiently excited by ultraviolet and near-ultraviolet light, the optimized concentration is 4 mol%. Three emission peaks locate at 562, 596 and 642 nm, corresponding to CIE chromaticity coordinates of (x = 0.54, y = 0.46), which indicates the orange light emitting. The decay curves are well fitted with triple-exponential decay models. The quantum yield of the Sr0.96Sm0.04WO4 phosphor is about 70.65% under excitation of 377 nm. Furthermore, the temperature-dependent luminescence indicates the phosphor exhibits a small thermal-quenching property. So the phosphor is able to be applied to UV-LED chip-based white light-emitting diodes. (C) 2010 Elsevier B.V. All rights reserved.
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