Room-temperature synthesis and warm-white LED applications of Mn4+ ion doped fluoroaluminate red phosphor Na3AlF6:Mn4+. Issue 13 (16th March 2016)

• Record Type: Journal Article
• Authors: Song, E. H.; Wang, J. Q.; Ye, S.; Jiang, X. F.; Peng, M. Y.; Zhang, Q. Y.
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 13(2016)
• Page Start: 2480
• Page End: 2487
• Publication Date: 2016-03-16
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6tc00502k
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : An intense red fluoroaluminate phosphor, cryolite Na3 AlF6 :Mn 4+, with high color purity and good thermal stability has been designed and synthesized via a facile two-step method at room temperature. Abstract : A novel red fluoroaluminate phosphor, cryolite Na3 AlF6 :Mn 4+, 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, Na3 AlF6 :1.58%Mn 4+, 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:Ce 3+ and red phosphor Na3 AlF6 :Mn 4+ .