Ma Tengfei, Li Haifeng, Zhang Su, Sun Wenzhi, Cheng Zhiqiang, Pang Ran, Feng Jing, Jiang Lihong, Li Da, Li Chengyu
State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 P. R. China
Shandong Industrial Ceramic Research & Design Institute Co., Ltd Zibo 255000 Shandong Province P. R. China.
RSC Adv. 2020 Jul 27;10(47):28049-28058. doi: 10.1039/d0ra02942d.
Long afterglow phosphors play a significant role in practical applications. However, due to their complex electronic structures, it is difficult to obtain tunable long afterglow phosphors. Herein, a novel long afterglow phosphor, GdYGaAlO:Tb, was successfully synthesized. Its detailed structural information was extracted the Rietveld method, and its corresponding optical properties were further systematically explored photoluminescence (PL), phosphorescence and thermoluminescence (TL) spectroscopy. Both the photoluminescence and long afterglow properties showed tunable behavior with a variation in the concentration of Tb. The investigation of the tunability of its photoluminescence and long afterglow properties revealed that the cross-relaxation energy transfer mechanism contributes to its tunable character. Meanwhile, long-lasting phosphorescence could be observed for a few hours by the naked eye in a dark environment after discontinuing the UV irradiation. Due to the potential existence of the photo-excited (Tb), the defect clusters were proposed, with oxygen vacancies acting as electron trapping centers and (Tb) attracting holes. Finally, an appropriate mechanism for the tunable long afterglow emission was proposed.
长余辉磷光体在实际应用中发挥着重要作用。然而，由于其复杂的电子结构，难以获得可调控的长余辉磷光体。在此，一种新型长余辉磷光体GdYGaAlO:Tb被成功合成。通过Rietveld方法提取了其详细的结构信息，并通过光致发光（PL）、磷光和热释光（TL）光谱进一步系统地探究了其相应的光学性质。光致发光和长余辉性质均随Tb浓度的变化呈现出可调控的行为。对其光致发光和长余辉性质可调性的研究表明，交叉弛豫能量转移机制有助于其可调特性。同时，在停止紫外照射后，在黑暗环境中用肉眼可观察到持续数小时的长余辉磷光。由于光激发（Tb）的潜在存在，提出了缺陷簇，其中氧空位作为电子俘获中心，而（Tb）吸引空穴。最后，提出了一种适用于可调长余辉发射的机制。
