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Dy3+ Doped Ca9Gd(PO4)7: a novel single-phase full-color emitting phosphor

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Abstract

A series of un-doped and Dy3+ doped Ca9Gd(PO4)7 phosphors were synthesized by traditional solid state reactions. X-ray diffraction analysis and scanning electronic microscope observation were carried out to examine the phase formation and morphology of prepared samples. Emission spectra under the excitation at 350 nm ultraviolet light turn out that main emission bands are located at 480, 570 and 659 nm, which can be assigned to the optical transitions 4F9/2 → 6H15/2, 4F9/2 → 6H13/2 and 4F9/2 → 6H11/2 of Dy3+, respectively. Comparison of emission spectra upon excitation of 273 nm between un-doped and Dy3+ doped Ca9Gd(PO4)7 samples proves that effective energy transfer from Gd3+ to Dy3+ takes place. The Commission International de I’Eclairage color coordinates (0.272, 0.322) located in white region was achieved. With the increasing doping concentration of Dy3+, concentration quenching is clearly observed and the optimum content of doped Dy3+ is 0.12. The mechanism of concentration quenching is experimentally ascertained to be electric dipole–dipole interactions. The study of quantum efficiency and thermal stability shows that our phosphors have higher quantum efficiency and better thermal stability. This work indicates that our phosphors have potential applications in white light-emitting diodes.

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Acknowledgements

This work is financially supported by the Science and Technology Program of Guangzhou, China (201707010324, 201607010345), Key Platforms and Research Projects of Department of Education of Guangdong Province (2016KTSCX031, 2016KTSCX034), National Natural Science Foundation of China (11674310, 11704078, 61704034), Pearl River S&T Nova Program of Guangzhou (201710010143) and Innovation and Entrepreneurship Training Programs (201611845030, 201611845141 and yj201611845348) for Chinese College Students.

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Authors and Affiliations

  1. Experimental Teaching Department, Guangdong University of Technology, Waihuan Xi Road, No.100, Guangzhou, 510006, People’s Republic of China

    Lurong Yang, Zhongfei Mu, Daoyun Zhu & Yu Zhao

  2. School of Physics & Optoelectronic Engineering, Guangdong University of Technology, Waihuan Xi Road, No.100, Guangzhou, 510006, People’s Republic of China

    Lurong Yang

  3. Basic Courses Department, Guangzhou Maritime University, Hongshan Three Road, No. 101, Guangzhou, 510725, People’s Republic of China

    Shaoan Zhang

  4. School of Materials and Energy, Guangdong University of Technology, Waihuan Xi Road, No.100, Guangzhou, 510006, People’s Republic of China

    Qiang Wang, Dongxiang Luo, Qingtian Zhang & Fugen Wu

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  1. Lurong Yang
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Correspondence to Zhongfei Mu.

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Yang, L., Mu, Z., Zhang, S. et al. Dy3+ Doped Ca9Gd(PO4)7: a novel single-phase full-color emitting phosphor. J Mater Sci: Mater Electron 29, 6548–6555 (2018). https://doi.org/10.1007/s10854-018-8638-7

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  • DOI: https://doi.org/10.1007/s10854-018-8638-7

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