Gong Hao, Yu Heng, Zhang Yang, Feng Letong, Tian Yang, Cui Ganglong, Fu Hongbing
Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Capital Normal University, Beijing, 100048, China.
Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, China.
Angew Chem Int Ed Engl. 2023 Mar 27;62(14):e202219085. doi: 10.1002/anie.202219085. Epub 2023 Feb 21.
Long persistent luminescence (LPL) materials of SrAl O doped with Eu or Dy can maintain emission over hours after ceasing the excitation but suffer from insolubility, high cost, and harsh preparation. Recently, organic LPL of guest-host exciplex systems has been demonstrated via an intermediate charge-separated state with flexible design but poor air-stability. Here, we synthesized a nontoxic two-dimensional organic-inorganic metal hybrid halides (OIMHs), called PBA [ZnX ] with X=Br or Cl and PBA=4-phenylbenzylamine. These materials exhibit stable LPL emission over minutes at room-temperature, which is two orders of magnitude longer than those of previously reported OIMHs. The mechanism study shows that the LPL emission comes from thermally activated charge separation state rather than room-temperature phosphorescence. Moreover, the LPL of PBA [ZnX ] can be excited by low power sources, representing an effective strategy for developing low-cost and high-stability LPL systems.
掺杂铕或镝的SrAlO长余辉发光（LPL）材料在停止激发后能保持数小时的发光，但存在不溶性、成本高和制备条件苛刻等问题。最近，客体-主体激基复合物体系的有机LPL已通过具有灵活设计的中间电荷分离态得到证实，但空气稳定性较差。在此，我们合成了一种无毒的二维有机-无机金属卤化物（OIMHs），称为PBA[ZnX]，其中X = Br或Cl，PBA = 4-苯基苄胺。这些材料在室温下能稳定发光数分钟，比先前报道的OIMHs的发光时间长两个数量级。机理研究表明，LPL发射来自热激活电荷分离态而非室温磷光。此外，PBA[ZnX]的LPL可以由低功率源激发，这代表了一种开发低成本和高稳定性LPL系统的有效策略。
