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Tunable emission, energy transfer, and thermal stability of Ce3+-doped and Ce3+/Tb3+ Co-doped Ca9Sr(PO4)6Cl2 phosphors

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Abstract

Ce3+-doped and Ce3+/Tb3+ co-doped Ca9Sr(PO4)6Cl2 phosphors were synthesized successfully via a traditional high-temperature solid-state reaction. The crystal structure, photoluminescent properties including temperature-dependent luminescence, and energy transfer of the as-prepared phosphors were investigated. The as-prepared Ca9Sr(PO4)6Cl2:Ce3+ phosphors exhibit a broad excitation band ranging from 220 to 385 nm and blue light-emitting band centered at 431 nm, which originate from the 4f–5d transitions of Ce3+ ion. The luminescent intensities of Tb3+ ions were dramatically enhanced by the introduction of Ce3+ in the Ca9Sr(PO4)6Cl2:Tb3+ phosphors because of the efficient energy transfer from Ce3+ to Tb3+ ions, generating tunable blue-green emission colors. The mechanism of energy transfer between Ce3+ and Tb3+ ions was demonstrated to be an electric dipole–quadrupole interaction. Moreover, the energy transfer efficiency was evaluated up to 75 % based on the analysis of the emission spectra. The temperature-dependent photoluminescence indicates that the as-prepared Ce3+/Tb3+ co-doped Ca9Sr(PO4)6Cl2 phosphors have excellent thermal stability. Our results suggest that the Ce3+-doped and Ce3+/Tb3+ co-doped Ca9Sr(PO4)6Cl2 phosphors have potential application for n-UV pumped WLEDs.

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Acknowledgements

This work was partially supported by the National Natural Science Foundation of China (NSFC, 51302182), the National High Technology Research and Development Program (“863” Program) of China (2015AA016901), the Qualified Personnel Foundation of Taiyuan University of Technology (QPFT) (No: tyut-rc201361a), and the Program for the outstanding Innovative Teams of Higher Learning Institutions of Shanxi.

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  1. Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education, College of Physics and Optoelectronic Engineering, Taiyuan University of Technology, Taiyuan, 030024, People’s Republic of China

    Lijuan Feng, Yue Tian, Lei Wang, Cai’e Cui, Qiufeng Shi & Ping Huang

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  1. Lijuan Feng
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  2. Yue Tian
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Correspondence to Yue Tian or Ping Huang.

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Feng, L., Tian, Y., Wang, L. et al. Tunable emission, energy transfer, and thermal stability of Ce3+-doped and Ce3+/Tb3+ Co-doped Ca9Sr(PO4)6Cl2 phosphors. J Mater Sci 51, 2841–2849 (2016). https://doi.org/10.1007/s10853-015-9592-x

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