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Enhanced luminescence of Mn4+-activated CaAl12O19 red phosphors by synergetic manipulation of the flux effect and charge compensation for warm WLEDs application

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Abstract

Mn4+-activated phosphors have become a hotspot in the development of inorganic red phosphors due to the fascinating photoluminescent properties. Herein, the synergetic manipulation of the flux effect and charge compensation was employed to improve the performance of Mn4+-activated CaAl12O19 red phosphors. The crystallinity was improved by appropriate Zn2+-doping, while nonradiative transition between Mn4+ ions is reduced by charge compensation of the formation of Mn4+–Mg2+ pairs with Mg2+ dopants. Thus, the emission of Mn4+-activated CaAl12O19 red phosphors has been remarkably enhanced. The low probability of nonradiative transition between Mn4+ ions was demonstrated by the thermal stability analysis. To depict the luminescent process, the crystal-field strength (Dq), and Racah parameters (B and C) were calculated to determine the sequence of the energy levels. Meanwhile, the warm WLEDs with high CRI and low CCT were obtained using the prepared phosphors as red-emitting composition. Our results clearly suggested that the synergetic strategy by combining the flux effect and charge compensation is an effective method to enhance the luminescence of CaAl12O19:Mn4+, and CaAl12O19:Mn4+/Zn2+/Mg2+ red-emitting phosphors, which have potential application value in warm WLEDs.

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Acknowledgements

This work was financially supported by the Natural Science Foundation of Guangxi (No. AD19245046, AD19245028, AA21077012, 2020GXNSFBA297064, 2018GXNSFBA138007, 2018GXNSFBA281073, 2018GXNSFAA294021), the National Natural Science Foundation of China (Grant No. 11664003).

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    1. School of Physics Science and Technology, Guangxi Normal University, Guilin, 541004, People’s Republic of China

      Youyi He, Jun Liu, Yalei Gao, Fengzhen Lv, Fuchi Liu & Lizhen Long

    2. School of Electronics and Information Technology, Guangdong Ocean University, Zhanjiang, 524088, People’s Republic of China

      Lijuan Yan

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    He, Y., Liu, J., Gao, Y. et al. Enhanced luminescence of Mn4+-activated CaAl12O19 red phosphors by synergetic manipulation of the flux effect and charge compensation for warm WLEDs application. J Mater Sci: Mater Electron 32, 27513–27523 (2021). https://doi.org/10.1007/s10854-021-07126-4

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