Wang Shaoying, Sun Qi, Devakumar Balaji, Liang Jia, Sun Liangling, Huang Xiaoyong
College of Physics and Optoelectronics, Taiyuan University of Technology Taiyuan 030024 P. R. China
RSC Adv. 2019 Jan 25;9(6):3429-3435. doi: 10.1039/c8ra10158b. eCollection 2019 Jan 22.
In this paper, we report on highly efficient Mn-activated double perovskite LiMgSbO (LMS) red-emitting phosphors. These LMS:Mn phosphors can be efficiently excited over a broad wavelength band from 235 nm to 600 nm peaking at 344 nm and 469 nm, and exhibited an intense red emission band with a range from 600 nm to 800 nm centered around 651 nm. The optimal Mn doping concentration of LMS:Mn was 0.6 mol% and its internal quantum efficiency can reach as high as 83%. Besides, the thermal quenching effect on the optical property was also analyzed. Finally, a warm white light-emitting diode (WLED) lamp was fabricated by using a 454 nm InGaN blue LED chip combined with a blend of YAG:Ce yellow phosphors and the as-prepared LMS:0.6% Mn red phosphors, which showed bright white light with CIE chromaticity coordinates (0.4093, 0.3725), correlated color temperature (CCT = 3254 K), color rendering index (CRI = 81) and luminous efficacy (LE = 87 lm/W).
在本文中，我们报道了高效的锰激活双钙钛矿LiMgSbO（LMS）红色发光荧光粉。这些LMS:Mn荧光粉能在235nm至600nm的宽波长范围内被有效激发，在344nm和469nm处有峰值，并且呈现出一个以651nm为中心、范围从600nm至800nm的强烈红色发射带。LMS:Mn的最佳锰掺杂浓度为0.6mol%，其内部量子效率可高达83%。此外，还分析了热猝灭对光学性能的影响。最后，通过使用454nm的InGaN蓝色LED芯片与YAG:Ce黄色荧光粉和所制备的LMS:0.6%Mn红色荧光粉的混合物制成了一个暖白色发光二极管（WLED）灯，该灯发出的明亮白光的CIE色度坐标为(0.4093, 0.3725)，相关色温（CCT = 3254K），显色指数（CRI = 81），发光效率（LE = 87lm/W）。
