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An efficient rare-earth free red-emitting Ca2YSbO6:Mn4+,M(M=Li+, Na+, K+, Mg2+) phosphors for white light-emitting diodes

Abstract

Owing to its low-cost and satisfactory luminescent performance applied in warm white light-emitting diodes (w-LEDs), the non-rare-earth Mn4+-activated red phosphor has become a promising competitor of commercial rare-earth doped one. In this study, a series of novel red-emitting phosphors Ca2YSbO6:Mn4+ have been developed successfully by a conventional solid-state reaction. The structural and luminescent properties of these phosphors are systematically investigated. The prepared Ca2YSbO6:Mn4+ product exhibits a broad excitation band ranging from 250 to 600 nm and an abnormal intense deep-red emission centered at 680 nm with a full width at half maximum (FWHM) of ~46 nm. The optimal Mn4+ doping concentration is about 0.03 mol%, and the concentration quenching mechanism is determined to be a dipole-dipole interaction. Impressively, the Ca2YSbO6:0.03%Mn4+ shows an outstanding quantum efficiency of 62.6% and an excellent thermal stability. In addition, the effect of Li+, Mg2+, Na+ and K+ dopants on the luminescent properties of Mn4+-doped Ca2YSbO6 phosphors is elucidated. Furthermore, by employing the as-prepared Ca2YSbO6: Mn4+ as a red component, a warm w-LED with high color rendering index (Ra = 87.5) and low correlated color temperature (CCT=3255 K) can be acquired. It is believed that the present phosphor has potential application as a supplement of the red component for warm w-LEDs.

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Publication details

The article was received on 15 Mar 2018, accepted on 11 Apr 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C8DT00992A
Citation: Dalton Trans., 2018, Accepted Manuscript
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    An efficient rare-earth free red-emitting Ca2YSbO6:Mn4+,M(M=Li+, Na+, K+, Mg2+) phosphors for white light-emitting diodes

    J. Zhong, D. Chen, X. Chen, K. Wang, X. Li, Y. Zhu and Z. Ji, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT00992A

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