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Issue 36, 2017
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Room-temperature synthesis and optimized photoluminescence of a novel red phosphor NaKSnF6:Mn4+ for application in warm WLEDs

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Abstract

A kind of red-emitting phosphor NaKSnF6:Mn4+ (NKSF:Mn) has been obtained from NaF and KF with a certain molecular ratio in HF solution at room temperature. The phosphor NKSF:Mn exhibits superior optical properties including high color purity with narrow-band emissions as well as better chromaticity coordinates compared to the red phosphors Na2SnF6:Mn4+ (NSF:Mn) and K2SnF6·H2O:Mn4+ (KSFH:Mn). The composition and structure of NKSF:Mn have been identified by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and transmission electron microscopy (TEM). The formation mechanism of NKSF:Mn is discussed and the morphology, thermal stability, and optical properties of NKSF:Mn have been investigated. The luminescence intensity of NKSF:Mn has been improved by optimizing synthetic parameters. A white light-emitting diode (WLED) fabricated using a blue GaN chip, a yellow YAG:Ce phosphor, and the as-prepared red phosphor NKSF:Mn exhibits superior warm white light with a color rendering index (CRI) of 90.3 at a correlated color temperature (CCT) of 3746 K.

Graphical abstract: Room-temperature synthesis and optimized photoluminescence of a novel red phosphor NaKSnF6:Mn4+ for application in warm WLEDs

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Publication details

The article was received on 05 Jul 2017, accepted on 07 Aug 2017 and first published on 08 Aug 2017


Article type: Paper
DOI: 10.1039/C7TC02996A
Citation: J. Mater. Chem. C, 2017,5, 9255-9263
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    Room-temperature synthesis and optimized photoluminescence of a novel red phosphor NaKSnF6:Mn4+ for application in warm WLEDs

    L. Xi, Y. Pan, M. Zhu, H. Lian and J. Lin, J. Mater. Chem. C, 2017, 5, 9255
    DOI: 10.1039/C7TC02996A

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