Photoluminescence properties of Pr3+ ion-doped YInGe2O7 phosphor under an ultraviolet irradiation |
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| Authors: | Lay-Gaik Teoh Mu-Tsun Tsai You-Chia Chang Yee-Shin Chang |
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| Affiliation: | 1. Department of Mechanical Engineering, National Pingtung University of Science and Technology, Neipu, Pingtung 912, Taiwan;2. Department of Materials Science and Engineering, National Formosa University, Huwei, Yunlin 632, Taiwan;3. Department of Electronic Engineering, National Formosa University, Huwei, Yunlin 632, Taiwan |
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| Abstract: | Pr3+ ion-doped YinGe2O7 phosphors are synthesized by a vibrating milled solid state reaction. There is a red shift for the excitation peak for the charge transfer transition between In3+ and O2- ion because the numbers of oxygen vacancies change the structure, which leads to a change in the crystal field. The results indicate that the emission spectra for the YinGe2O7:Pr samples under an excitation of 263 nm exhibit two dominant peaks at 486 and 604 nm, which are respectively assigned to the 3P0→3H4 and 1D2→3H4 transitions. The chromaticity coordinate for (Y1?xPrx)InGe2O7 phosphors varies with the Pr3+ doping concentration, from white, to greenish, to blueish. This has a potential application as a white light emitting phosphor for ultraviolet light-emitting diodes. |
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| Keywords: | Photoluminescence Phosphor Optical properties Praseodymium |
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