Issue 27, 2019

A thermally stable narrow-band green-emitting phosphor MgAl2O4:Mn2+ for wide color gamut backlight display application

Abstract

The discovery of stable narrow-band green emitting phosphor suitable for blue InGaN chip excitation is crucial to improve the color gamut of the phosphor converted backlighting device. However, it is a great challenge. Herein, a Mn2+ activated thermally stable narrow-band green emitting phosphor MgAl2O4:Mn2+ peaking at 525 nm with a full-width at half-maximum (FWHM) of 35 nm and a quantum efficiency of 45% upon 450 nm blue-light excitation is demonstrated. This phosphor does not exhibit thermal quenching even up to 300 °C (109.5%@300 °C of the integrated emission intensity at 23 °C) due to the high rigidity of the host MgAl2O4. Using the as-synthesized optimized phosphor Mg0.95Al2O4:0.05Mn2+ as the green light component, and a commercial phosphor K2SiF6:Mn4+ as the red one, an InGaN chip excited white LED device with a color gamut of 116% National Television System Committee (NTSC) standard is obtained. Furthermore, by applying the fabricated LED device for backlights in a liquid crystal display (LCD) TV, a more colorful frame can be realized compared to when commercial LED backlights are used, suggesting that the Mn2+ ion based green emitting phosphor has great potential for application as LCD backlights.

Graphical abstract: A thermally stable narrow-band green-emitting phosphor MgAl2O4:Mn2+ for wide color gamut backlight display application

Supplementary files

Article information

Article type
Paper
Submitted
20 4 2019
Accepted
15 5 2019
First published
16 5 2019

J. Mater. Chem. C, 2019,7, 8192-8198

A thermally stable narrow-band green-emitting phosphor MgAl2O4:Mn2+ for wide color gamut backlight display application

E. H. Song, Y. Y. Zhou, Y. Wei, X. X. Han, Z. R. Tao, R. L. Qiu, Z. G. Xia and Q. Y. Zhang, J. Mater. Chem. C, 2019, 7, 8192 DOI: 10.1039/C9TC02107H

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