Sun Qi, Wang Shaoying, Devakumar Balaji, Sun Liangling, Liang Jia, Huang Xiaoyong
College of Physics and Optoelectronics, Taiyuan University of Technology Taiyuan 030024 P. R. China
RSC Adv. 2019 Jan 24;9(6):3303-3310. doi: 10.1039/c8ra09928f. eCollection 2019 Jan 22.
In the present work, novel high-efficiency Mn-activated BaLaMgSbO (BLMS) far-red-emitting phosphors used for plant growth LEDs were successfully synthesized a solid-state reaction method. X-ray diffraction (XRD), photoluminescence (PL), temperature-dependent PL, CIE color coordinates, and lifetimes as well as internal quantum efficiency (IQE) were used to characterize the phosphor samples. The excitation spectrum of the as-obtained BLMS:Mn phosphors presented two wide bands covering 250-550 nm and the emission spectrum exhibited a far-red emission band in the range of 650-800 nm peaked at 700 nm. Concentration-dependent PL properties of BLMS:Mn phosphors were studied. The optimal doping concentration of Mn ions was 0.6 mol%, and the concentration quenching mechanism was determined to be the nonradiative energy transfer among the nearest-neighbor Mn activators. Impressively, the BLMS:0.6%Mn sample showed an outstanding IQE of 83%. In addition, luminescence thermal quenching characteristics were also analyzed. Furthermore, the PL spectrum of BLMS:0.6%Mn sample was compared with the absorption spectrum of phytochrome P. Finally, after combining BLMS:0.6%Mn phosphors with a 365 nm near-UV LED chip, a far-red light-emitting diode (LED) device was successfully achieved to demonstrate its possible applications in plant growth LEDs.
在本工作中，采用固态反应法成功合成了用于植物生长LED的新型高效Mn激活的BaLaMgSbO（BLMS）远红光发射荧光粉。利用X射线衍射（XRD）、光致发光（PL）、变温PL、CIE色坐标、寿命以及内量子效率（IQE）对荧光粉样品进行了表征。所制备的BLMS:Mn荧光粉的激发光谱呈现出覆盖250 - 550 nm的两个宽带，发射光谱在650 - 800 nm范围内呈现出一个远红光发射带，峰值位于700 nm。研究了BLMS:Mn荧光粉浓度依赖的PL性质。Mn离子的最佳掺杂浓度为0.6 mol%，确定浓度猝灭机制为最近邻Mn激活剂之间的非辐射能量转移。令人印象深刻的是，BLMS:0.6%Mn样品表现出83%的出色IQE。此外，还分析了发光热猝灭特性。此外，将BLMS:0.6%Mn样品的PL光谱与植物色素P 的吸收光谱进行了比较。最后，将BLMS:0.6%Mn荧光粉与365 nm近紫外LED芯片结合后，成功制备出远红光发光二极管（LED）器件，以展示其在植物生长LED中的潜在应用。
