期刊
JOURNAL OF LUMINESCENCE
卷 236, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2021.118101
关键词
Mn2+ green emission; Color purity; Substitution; Wide color gamut
类别
资金
- Science and Technology Plan of Guangdong Province [2020A0505100055]
- Guangzhou Science and Technology Plan [202002030325]
- Science and Technology Program of Guangzhou [201905001]
- National Natural Science Foundation of China (NSFC)-Guangdong Joint funding support [U1801256]
- South China Normal University [201972, 8S0347, 18KJ11]
A novel rare-earth-free narrow-band green-emitting phosphor has been developed, with improved luminescence performance achieved through simple compositional adjustments. This phosphor, combined with a red-emitting phosphor as light converters, has enabled the production of warm white light with a wide color gamut of 105% NTSC and a good color-rendering index of 90.6.
A variety of optoelectronic devices such as photovoltaics and light-emitting diodes need stable performance of phosphors and the most important factor in liquid-crystal display (LCD) backlights will be the color purity. Here, a novel rare-earth-free narrow-band green-emitting phosphor based on the substitution of Mg2+ for Zn2+ in the lattice of Zn3.98-xMgxB6O13:0.02Mn(2+) has been assembled via a solid-state reaction method. According to XRD and Rietveld refinement results, Zn3.98-xMgxB6O13:0.02Mn(2+) can achieve perfect solid solution phases at 0 <= x <= 0.2 in terms of the same cubic structure of Zn4B6O13 with space group I-43m (217). Under the excitation at 450 nm in blue region, Zn3.98-xMgxB6O13:0.02Mn(2+) phosphors possess the green emission band at lambda(max) similar to 542 nm and its full-width at half-maximum (FWHM) has been found to be only 39 nm. In addition, the emission intensity can be enhanced by increasing Mg content (x) from 0 to 0.1. It has to be mentioned that the thermal stability for the composition-optimized x = 0.1 sample is superior to that of the unsubstituted sample (x = 0). The underlying mechanism for this luminescence improvement has been verified. By virtue of assembling a green-emitting Zn3.98-xMgxB6O13:0.02Mn(2+) phosphor and a commercial red-emitting K2SiF6:Mn4+ phosphor as light converters, a warm white light has been achieved based on InGaN-based blue-LED (450 nm) and such device gives rise to wide color gamut of 105% National Television System Committee (NTSC) and good color-rendering index Ra of 90.6 at a correlated color temperature of 3683 K. Our results pave a new way in developing Mn2+-activated thermally stable narrow-band green-emitting phosphors with improving luminescence performance by simple compositional adjustments.
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