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A Green synthetic route to the highly efficient K2SiF6:Mn4+ narrow-band red phosphor for warm white light-emitting diodes

Abstract

Mn4+-doped K2SiF6 (KSF:Mn4+) is identified as a promising down-conversion narrow-band red phosphor used in warm-white light emitting diodes (wLEDs) or wide color gamut LED backlights, owing to their outstanding photoluminescence properties. However, the highly toxic and concentrated HF is essentially used as raw materials to synthesize KSF:Mn4+ phosphors, which leads to environmental and safety issues. Herein, we report a novel green synthetic route to prepare highly efficient KSF:Mn4+ red phosphors by using non-toxic NH4F/HCl instead of HF. The microstructure, photoluminescence properties and reaction mechanisms of the title phosphor were investigated and discussed. The KSF:Mn4+ phosphor (4.8% Mn) synthesized by this green route exhibits a spherical particle morphology and a fine particle size of 5.5 m. The internal and external quantum efficiencies of the phosphor are 92 and 44% under the 460 nm excitation, respectively. A warm wLED using KSF:Mn4+, YAG:Ce3+ and a blue LED chip is demonstrated to have the luminous efficacy of 137.2 lm W-1, correlated color temperature of 3585 K and color rendering index of Ra = 88.1, respectively. This indicates that the proposed green synthetic approach enables to prepare highly efficient KSF:Mn4+ phosphors that have the comparable ability with the commercial ones to produce warm wLEDs.

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Publication details

The article was received on 09 Jan 2018, accepted on 29 Jan 2018 and first published on 29 Jan 2018


Article type: Paper
DOI: 10.1039/C8TC00133B
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    A Green synthetic route to the highly efficient K2SiF6:Mn4+ narrow-band red phosphor for warm white light-emitting diodes

    Z. Hou, X. Tang, X. Luo, T. Zhou, L. Zhang and R. Xie, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC00133B

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