Acta Photonica Sinica, Volume. 44, Issue 7, 716001(2015)
Near Infrared Quantum Cutting in Pr3+, Yb3+ Co-doped CaWO4 Phosphors
Near-infrared quantum cutting CaWO4∶Pr3+, Yb3+ phosphors were prepared by the solid state reaction method. The effect of different concentrations of Yb3+ ions on the phase and luminescent properties of the samples was investigated by X-ray diffractometer, fluorescence spectrophotometer and luminescence lifetime decay curve. X-ray diffraction shows that all of samples are pure scheelite-typed CaWO4. Three near-infrared emission peaks located at 1001, 1030 and 1048 nm can be found in the emission spectra upon the excitation of 453-nm light, which correspond to 2F5/2→2F7/2 transition of Yb3+ and 1D2→3F4 transition of Pr3+, respectively. The luminescence lifetime decay curve of Pr3+(652 nm) with different Yb3+ concentrations is gradually shortened with the increase of Yb3+ ions concentration, which suggests energy transfer efficiency and quantum efficiency can be improved with the increase of Yb3+ ions concentration. The highest quantum efficiency can be calculated to be 166.9%. The material may be applied in the silicon solar cells to improve its photoelectric conversion efficiency.
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LI Yun-qing, CUI Cai-e, HUANG Ping, WANG Lei, TIAN Yue, JIA Hai-zhen. Near Infrared Quantum Cutting in Pr3+, Yb3+ Co-doped CaWO4 Phosphors[J]. Acta Photonica Sinica, 2015, 44(7): 716001
Received: Jan. 12, 2015
Accepted: --
Published Online: Aug. 25, 2015
The Author Email: Yun-qing LI (liyunqing140227@163.com)