Thermal stability and photoluminescence of Mn2+ activated green-emitting feldspar phosphor SrAl2Si2O8: Mn2+ for wide gamut w-LED backlight

• Published in: Optical materials Vol. 99; p. 109535
• Main Authors: Wang, Bo, Kong, Youchao, Chen, Zikun, Li, Xiaoshuang, Wang, Shuangpeng, Zeng, Qingguang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2020
• Subjects: Mn2; Narrow-band green emission; Phosphor; Photoluminescence; Mn2; Phosphor; Photoluminescence; Narrow-band green emission
• ISSN: 0925-3467; 1873-1252
• DOI: 10.1016/j.optmat.2019.109535

An oxide-based green emitting phosphor, SrAl2Si2O8: Mn2+ (SASO: Mn2+) deriving from the feldspar mineral model has been successfully synthesized by a facile solid-state reaction. Upon 450 nm blue-light excitation, brightness narrow-band green light peaking at 517 nm with a full-width at half-maximum (fwhm) of 26 nm can be obtained. Owing to the narrow band emission, the CIE chromaticity coordinates are (0.182, 0.745) and the color purity of SASO: Mn2+ is determined to be 78.3%. Meanwhile, the internal quantum efficiency (IQE) of the representative sample can reach up to 45.6% under 450 nm. In addition, the phosphor exhibits an extremely thermal stability, i.e., the integrated emission intensity at 420 K still remains 92% of the initial value. Furthermore, w-LED device fabricated from optimized phosphor SASO: Mn2+ (green), commercial phosphor KSF: Mn4+ (red) and blue LED chip can cover 120% National Television System Committee standard (NTSC) value. All these results suggest that the Mn2+ ion activated green emitting phosphor has great potential for wide gamut w-LEDs backlights. •A narrow-band green-emitting Mn2+ doped SrAl2Si2O8 phosphor was synthesized.•The phosphor has a broad excitation band, which can match well with blue chips.•The phosphor has excellent thermal and color stability, high color purity.