Issue 13, 2016

Room-temperature synthesis and warm-white LED applications of Mn4+ ion doped fluoroaluminate red phosphor Na3AlF6:Mn4+

Abstract

A novel red fluoroaluminate phosphor, cryolite Na3AlF6:Mn4+, has been designed and synthesized via a facile two-step method at room temperature. Under blue light excitation, it exhibits intense sharp line red fluorescence (∼630 nm) with high color purity. The crystal structure, morphology and doping concentration of the samples were characterized in detail using X-ray diffraction (XRD), scanning electron microscopy (SEM) and ICP-AES. The influence of synthesis conditions, raw materials and doping concentration on crystal structure and photoluminescence (or decay behavior) has been investigated carefully. The optimal composition, Na3AlF6:1.58%Mn4+, shows a bright red light and excellent thermal stability (∼99.93% of the emission intensity at 200 °C relative to 23 °C) upon ∼467 nm blue light excitation. A warm high-power white LED with a high color rendering index (Ra = 92.7 and R9 = 94) and low color temperature (CCT = 3903 K) was fabricated based on the blue InGaN chip, commercial yellow phosphor YAG:Ce3+ and red phosphor Na3AlF6:Mn4+.

Graphical abstract: Room-temperature synthesis and warm-white LED applications of Mn4+ ion doped fluoroaluminate red phosphor Na3AlF6:Mn4+

Article information

Article type
Paper
Submitted
02 Feb 2016
Accepted
03 Mar 2016
First published
04 Mar 2016

J. Mater. Chem. C, 2016,4, 2480-2487

Room-temperature synthesis and warm-white LED applications of Mn4+ ion doped fluoroaluminate red phosphor Na3AlF6:Mn4+

E. H. Song, J. Q. Wang, S. Ye, X. F. Jiang, M. Y. Peng and Q. Y. Zhang, J. Mater. Chem. C, 2016, 4, 2480 DOI: 10.1039/C6TC00502K

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