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Design, preparation, and optimized luminescence of a dodec-fluoride phosphor Li3Na3Al2F12:Mn4+ for warm WLEDs application

Abstract

Mn4+-activated red phosphors have attracted considerable attention as promising red compensations in spectra of white light emitting diodes (WLEDs) to achieve warm white light with superior performance. Herein, a novel red phosphor based on Mn4+-doped dodec-fluoride Li3Na3Al2F12:Mn4+ (LNAF:Mn) with micro cubic morphology was obtained at room temperature. To elucidate the underlying relationship between crystal structure and photoluminescence of LNAF:Mn, a phosphor LiNa2AlF6:Mn4+ with similar composition has been prepared, and their morphology and optical properties were comparatively investigated. The emission of the red phosphor LNAF:Mn is blue shifted compared to LiNa2AlF6:Mn4+ suggesting that the chromaticity coordinates of LANF:Mn are closer to the ideal red point (0.67, 0.33). The luminescence properties of LNAF:Mn have been improved by optimizing synthetic conditions. This work exhibits a strategy to explore a novel Mn4+-doped fluoride except for the identified hexa-fluorides. Employing the as-prepared red LNAF:Mn as a red component, a high-performance WLED with a correlated color temperature (CCT) of 3874 K and a color rendering index (CRI) of 90.6 was obtained. This suggests the phosphor is a potential commercial red phosphor in warm WLEDs.

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Supplementary files

Publication details

The article was received on 21 Aug 2017, accepted on 13 Sep 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7TC03805D
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Design, preparation, and optimized luminescence of a dodec-fluoride phosphor Li3Na3Al2F12:Mn4+ for warm WLEDs application

    M. Zhu, Y. Pan, L. Xi, H. Lian and J. Lin, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03805D

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