Ma Chenggang, Chen Hailiang, Luo Min, Duan Fuyun, Ding Yun, Han Yihang, Zheng Tianxiang, Yang Xun, Xiao Yu
College of Science, Nanjing Forestry University, Nanjing 210037, P. R. China.
Shandong INOV Polyurethane CO., Ltd, Zibo 255000, P. R. China.
Dalton Trans. 2024 Aug 27;53(34):14153-14162. doi: 10.1039/d4dt01843e.
At present, there are still challenges in developing highly efficient and thermally stable phosphors for ultraviolet/near ultraviolet-white light emitting diodes (UV/NUV-WLEDs). Herein, we use traditional high-temperature solid-state reactions to prepare blue-emitting phosphors LuBaBO:Ce (0.1% ≤ ≤ 3.0%) and LuBaSrBO:0.5%Ce (0% ≤ ≤ 20%), and green-emitting phosphors LuBaBO:0.5%Ce,Tb (0% ≤ ≤ 16%), abbreviated as LBB:Ce, LBB:0.5%Ce,Sr and LBB:0.5%Ce,Tb, respectively. Upon 340 nm excitation, LBB:Ce exhibits an asymmetric blue emission ranging from 360 nm to 480 nm. Furthermore, the emission intensity of LBB:0.5%Ce increased 4.8-fold without a spectral shift through the partial substitution of Sr for Ba. Through constructing the Ce → Tb energy transfer in the LBB structure, the temperature-dependent integral emission intensity at 483 K improved from only 25% to 68% of the intensity at 303 K due to the existence of fast energy transfer from Ce to Tb. The related results indicate that LBB:Ce, LBB:0.5%Ce,Sr and LBB:0.5%Ce,Tb phosphors can be used for UV/NUV-WLEDs.
目前，在开发用于紫外/近紫外白光发光二极管（UV/NUV-WLEDs）的高效且热稳定的荧光粉方面仍存在挑战。在此，我们采用传统高温固相反应制备了蓝色荧光粉LuBaBO:Ce（0.1%≤≤3.0%）和LuBaSrBO:0.5%Ce（0%≤≤20%），以及绿色荧光粉LuBaBO:0.5%Ce,Tb（0%≤≤16%），分别简称为LBB:Ce、LBB:0.5%Ce,Sr和LBB:0.5%Ce,Tb。在340nm激发下，LBB:Ce呈现出从360nm到480nm的不对称蓝色发射。此外，通过用Sr部分替代Ba，LBB:0.5%Ce的发射强度提高了4.8倍且光谱无位移。通过在LBB结构中构建Ce→Tb能量转移，由于存在从Ce到Tb的快速能量转移，在483K时与温度相关的积分发射强度从仅为303K时强度的25%提高到了68%。相关结果表明，LBB:Ce、LBB:0.5%Ce,Sr和LBB:0.5%Ce,Tb荧光粉可用于UV/NUV-WLEDs。
