Issue 36, 2017

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

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

Supplementary files

Article information

Article type
Paper
Submitted
05 Qad 2017
Accepted
07 Leq 2017
First published
08 Leq 2017

J. Mater. Chem. C, 2017,5, 9255-9263

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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