1. Luminescence and energy transfer of Mn2+ co-doped SrSi2O2N2:Eu2+ green-emitting phosphors
- Author
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Song, Xiufeng, Fu, Renli, Agathopoulos, Simeon, He, Hong, Zhao, Xinran, and Zeng, Jun
- Subjects
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PHOSPHORS , *SPECTRUM analysis , *PHOTOLUMINESCENCE , *ENERGY transfer , *STRONTIUM compounds , *EMISSION spectroscopy , *LIGHT emitting diodes , *ABSORPTION spectra , *OPTICAL reflection - Abstract
Abstract: Eu2+ and Mn2+ co-doped SrSi2O2N2 green-phosphors, with promising luminescent properties (examined by their powder diffuse reflection, photoluminescence excitation and emission spectra) suitable for UV converted white LEDs, were produced by high temperature solid-state reaction method. The produced materials exhibited intense broad absorption bands at 220–500nm and a broad emission band centered at ca. 530nm, attributed to 4f–5d transitions of Eu2+. The emission intensity of Eu2+ ions was greatly enhanced by introducing Mn2+ ions into SrSi2O2N2:Eu2+ due to the energy transfer from Mn2+ to Eu2+. The energy transfer probability from Mn2+ to Eu2+ depends strongly on the Mn2+ concentration, which is maximized at a Mn2+ concentration of 3mol%. It drastically decreases for higher concentrations. The results indicated that SrSi2O2N2:Eu2+, Mn2+ is a promising green-emitting phosphor for white-light emitting diodes with near-UV LED chips. [Copyright &y& Elsevier]
- Published
- 2009
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