Issue 11, 2017

The design and preparation of the thermally stable, Mn4+ ion activated, narrow band, red emitting fluoride Na3GaF6:Mn4+ for warm WLED applications

Abstract

Herein, a new red phosphor Na3GaF6:Mn4+ has been designed and synthesized by a facile two-step co-precipitation method at room temperature. Single crystal X-ray diffraction analysis reveals that the fluoride Na3GaF6 crystallizes in the P2(1)/n space group with a = 5.4760 Å, b = 5.6862 Å, c = 7.9009 Å, β = 90.309°, and z = 2. Upon blue or UV light excitation, the obtained phosphor Na3GaF6:Mn4+ emits intense and pure red fluorescence. The effects of raw materials, doping concentration and environmental temperature on its luminescence properties and crystal structure have been investigated and discussed in detail. Such a newly synthesized red phosphor shows excellent anti-thermal quenching behavior (∼118.8% of emission intensity at 150 °C relative to 25 °C) and good color stability upon blue light (∼467 nm) excitation. By using the Na3GaF6:Mn4+ phosphor as a red light component, a high-power stable warm white light-emitting diode (WLED, Ra = 81, CCT = 2966 K, luminous efficacy = 56.73 lm W−1) was fabricated, further evidencing the potential of the as-synthesized Na3GaF6:Mn4+ phosphor for white LED applications.

Graphical abstract: The design and preparation of the thermally stable, Mn4+ ion activated, narrow band, red emitting fluoride Na3GaF6:Mn4+ for warm WLED applications

Supplementary files

Article information

Article type
Paper
Submitted
02 Jan 2017
Accepted
13 Feb 2017
First published
14 Feb 2017

J. Mater. Chem. C, 2017,5, 2910-2918

The design and preparation of the thermally stable, Mn4+ ion activated, narrow band, red emitting fluoride Na3GaF6:Mn4+ for warm WLED applications

T. T. Deng, E. H. Song, J. Sun, L. Y. Wang, Y. Deng, S. Ye, J. Wang and Q. Y. Zhang, J. Mater. Chem. C, 2017, 5, 2910 DOI: 10.1039/C7TC00011A

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