A series of Y2Mo4O15:Pr3+, Tb3+ red-emitting phosphors is synthesized via a solid-state reaction. The X-ray diffraction results indicate that the patterns of Y2Mo4O15:Pr3+, Tb3+ samples match well with the standard Y2Mo4O15 monoclinic structure. Under blue excitation at 453 nm, the Y2Mo4O15:Pr3+ phosphors show a red emission peaked at 614 nm, corresponding to the characteristic 1D2 → 3H4 electronic transition of Pr3+. Under near-ultraviolet excitation at 375 nm, the Y2Mo4O15:Tb3+ phosphor results in a double emission at 552 nm and 490 nm, which corresponding to the 5D4 → 7F5 and 5D4 → 7F6 electronic transitions of Tb3+. Furthermore, the luminescence properties of Y2Mo4O15:Pr3+ phosphor, especially luminescence intensity, was observably improved by the Tb3+ co-doping, which due to the emission peak of Tb3+ matches well with the excitation peak of Pr3+ at 490 nm and the resulted energy transfer between Tb3+ and Pr3+. The chromaticity coordinates of Y2Mo4O15:Pr3+, Tb3+ phosphors are all located in the red region. The results indicate that the prepared Y2Mo4O15:Pr3+, Tb3+ red phosphors are suitable for the applications of blue-excited warm white light-emitting diodes.
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This work was financially supported by the National Natural Science Foundation of China (Grant No. 51602032, 41673109), the Research Project of Science & Technology Department of Sichuan Province (No. 2017SZ0185) and the Project of Chengdu University of Technology Innovation Team (Grant No. 10912-KYTD201506).
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Yan, G., Zhang, W., Huang, Y. et al. Luminescence enhancement for Y2Mo4O15:Pr3+ red-emitting phosphors by Tb3+ co-doping. J Mater Sci: Mater Electron 30, 14589–14599 (2019). https://doi.org/10.1007/s10854-019-01831-x