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Double-perovskite Ca2AlNbO6: Mn4+ red phosphor for white light emitting diodes: synthesis, structure and luminescence properties

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Abstract

The red-emitting phosphors Ca2AlNbO6: xmol%Mn4+ (CAN: xmol%Mn4+) (0.1 ≤ x ≤ 0.9) were successfully synthesized via a conventional high temperature solid-state method at air atmosphere. A band was located at 320 nm in diffuse reflection spectra (DRS) because of the spin-allowed 4A2g → 4T1g transition of Mn4+. Moreover, there were two broad bands located at photoluminescence excitation (PLE) spectra due to the spin-allowed transitions of Mn4+ upon the excitation of 712 nm. And the phosphors exhibited the far-red emission bands centered at ~ 712 nm on account of the spin-forbidden 2Eg → 4A2g transition of Mn4+ under the excitation of 355 nm. And the optimum one was CAN: 0.3 mol%Mn4+ which yields the brightest red light due to the concentration quenching effect. Furthermore, it could be confirmed that the existence of nonradiative among Mn4+ ions because the lifetime of the phosphors was decreased as the concentration of Mn4+ in CAN increased from 0.1% to 0.9 mol%. The average lifetime of the phosphors was in the range of miscroscend. In addition, the CIE chromaticity coordinates of CAN: 0.3 mol%Mn4+ were (0.7319, y = 0.2618). Finally, a blue LED chip combined with YAG: Ce3+ yellow and CAN: 0.3 mol% Mn4+ red phosphors to fabricate a warm white light emitting-diode (WLED). And the CIE chromaticity coordinates, color rendering index (CRI) and the corrected color temperature (CCT) of the device were (0.3799, 0.3432), 74.2 and 3727 K, respectively.

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Acknowledgements

This work was supported by Foundation of Shanghai Institute of Technology (XTCX2018-6), Shanghai Municipal Education Commission (14YZ145), Natural Science Foundation of Shanghai (16ZR1435900), National Science Foundation for Young Scientists of China (61605116), and National Natural Science Foundation of China (51572175).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 201418, People’s Republic of China

    Kuankuan Luo, Yan Zhang, Jiayue Xu, Junping Yuan, Liwu Huang & Di Xiang

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  1. Kuankuan Luo
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  2. Yan Zhang
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  3. Jiayue Xu
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  4. Junping Yuan
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Correspondence to Yan Zhang.

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Luo, K., Zhang, Y., Xu, J. et al. Double-perovskite Ca2AlNbO6: Mn4+ red phosphor for white light emitting diodes: synthesis, structure and luminescence properties. J Mater Sci: Mater Electron 30, 9903–9909 (2019). https://doi.org/10.1007/s10854-019-01328-7

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