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Issue 15, 2018
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Room-temperature synthesis, controllable morphology and optical characteristics of narrow-band red phosphor K2LiGaF6:Mn4+

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Abstract

A series of red phosphors based on the substitution of Mn4+ for Ga3+ in the lattice of K2LiGaF6 were synthesized via a co-precipitation method. Their structure, morphology and composition were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometry (EDS) in detail. The luminescence properties of the K2LiGaF6:Mn4+ samples were systematically evaluated by photoluminescence (PL) spectroscopy. The excitation spectrum consists of two broad bands from 300 to 550 nm. The obtained K2LiGaF6:Mn4+ can exhibit red light peaking at 636 nm for the 2Eg4A2g transition of Mn4+ ions under 470 nm excitation. A low concentration quenching phenomenon occurs in K2LiGaF6:Mn4+ and the optimal doping concentration is about 4%. The critical distance was calculated to be 9.107 Å. The changes of the emission intensity and morphology of K2LiGaF6:Mn4+ based on different lithium sources and surfactants were investigated in detail. White light-emitting diodes (WLEDs) fabricated from the red K2LiGaF6:Mn4+ phosphor exhibit good performance with a colour rendering index of 79.6, a low colour temperature of 4378 K and a luminous efficiency of 109.91 lm W−1. Therefore, the K2LiGaF6:Mn4+ red phosphors can be used as good candidates for WLEDs.

Graphical abstract: Room-temperature synthesis, controllable morphology and optical characteristics of narrow-band red phosphor K2LiGaF6:Mn4+

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Publication details

The article was received on 06 Feb 2018, accepted on 12 Mar 2018 and first published on 12 Mar 2018


Article type: Paper
DOI: 10.1039/C8CE00197A
Citation: CrystEngComm, 2018,20, 2183-2192
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    Room-temperature synthesis, controllable morphology and optical characteristics of narrow-band red phosphor K2LiGaF6:Mn4+

    H. Cheng, Y. Song, F. Hong, G. Liu, D. Li, Q. Ma, X. Dong, J. Wang and W. Yu, CrystEngComm, 2018, 20, 2183
    DOI: 10.1039/C8CE00197A

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