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Issue 3, 2018
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Designed synthesis, morphology evolution and enhanced photoluminescence of a highly efficient red dodec-fluoride phosphor, Li3Na3Ga2F12:Mn4+, for warm WLEDs

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Abstract

Red phosphors of the Mn4+ doped dodec-fluoride Li3Na3Ga2F12:Mn4+ (LNGF:Mn) with various morphologies have been synthesized from K2MnF6, LiF, NaF and Ga2O3 in HF at room temperature with excess LiF and NaF relative to the stoichiometric composition of LNGF:Mn. The formation mechanism of the red phosphor LNGF:Mn has been discussed based on detailed experimental results compared with that of the identified phosphor Li3Na3Al2F12:Mn4+ (LNAF:Mn). The optical properties of LNGF:Mn have been systematically investigated and compared with those of red phosphors Li3GaF6:Mn4+ (LGF:Mn), Na3GaF6:Mn4+ (NGF:Mn) and LNAF:Mn in detail. It is observed that the as-obtained phosphor LNGF:Mn exhibits superior properties in chromaticity coordinates as well as a high luminescence efficiency with a strong potential to enhance the performance of solid-state lighting. The HF-concentration-dependent morphologies of the phosphor LNGF:Mn have been investigated by scanning electron microscopy (SEM). The luminescence of the phosphor LNGF:Mn has been enhanced by optimizing the synthetic parameters, such as the concentrations of HF and K2MnF6. The white light-emitting diode (WLED) encapsulated with the as-obtained red phosphor LNGF:Mn and a commercial yellow one, Y3Al5O12:Ce3+ (YAG:Ce), on a GaN chip produces a warm white light with a color rendering index (CRI) of 91.32 at a correlated color temperature (CCT) of 3986.08 K.

Graphical abstract: Designed synthesis, morphology evolution and enhanced photoluminescence of a highly efficient red dodec-fluoride phosphor, Li3Na3Ga2F12:Mn4+, for warm WLEDs

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Publication details

The article was received on 26 Oct 2017, accepted on 06 Dec 2017 and first published on 07 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC04878E
Citation: J. Mater. Chem. C, 2018,6, 491-499
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    Designed synthesis, morphology evolution and enhanced photoluminescence of a highly efficient red dodec-fluoride phosphor, Li3Na3Ga2F12:Mn4+, for warm WLEDs

    M. Zhu, Y. Pan, Y. Huang, H. Lian and J. Lin, J. Mater. Chem. C, 2018, 6, 491
    DOI: 10.1039/C7TC04878E

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