Photoluminescence characterization of Ce and Dy doped Li2CaGeO4 phosphors |
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Authors: | Meng Jian-Xin Yang Chuang-Tao |
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Affiliation: | a Institute of Nanochemistry, Jinan University, Guangzhou 510632, People’s Republic of China b Department of Chemistry, Jinan University, Guangzhou 510632, People’s Republic of China |
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Abstract: | Ce3+ and Dy3+ activated Li2CaGeO4 phosphors were prepared by a solid-state reaction method, and characterized by XRD (X-ray diffraction) and photoluminescence techniques. The characteristic emission bands of Dy3+ due to 4F9/2→6H15/2 (blue) and 4F9/2→6H13/2 (yellow) transitions were detected in the emission spectra of Li2CaGeO4:Dy3+. Ce3+ broad band emission was observed in Li2CaGeO4:Ce3+ phosphors at 372 and 400 nm due to 5d→4f transition when excited at 353 nm. Co-doping of Ce3+ enhanced the luminescence of Dy3+ significantly and concentration quenching occurs when Dy3+ is beyond 0.04 mol%. White-light with different hues can be realized by tuning Dy3+ concentration in the phosphors. |
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Keywords: | Li2CaGeO4:Ce3+,Dy3+ Photoluminescence White light-emitting diodes |
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