Wang Bolun, Mu Ying, Zhang Hongyue, Shi Huaizhong, Chen Guangrui, Yu Yue, Yang Ziqi, Li Jiyang, Yu Jihong
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
College of Chemistry and Chemical Engineering, Qingdao University, Shandong 266071, P. R. China.
ACS Cent Sci. 2019 Feb 27;5(2):349-356. doi: 10.1021/acscentsci.8b00844. Epub 2019 Jan 22.
Carbon dots (CDs) with red-emitting room-temperature phosphorescence (RTP) are rarely reported because of the increasing nonradiative decay of the excited states and the decreasing energy gap between the excited states and ground states. Herein, we demonstrate a facile strategy for modulating the RTP properties of CDs in terms of donor-acceptor energy transfer (EnT) in the CDs-in-zeolite system. Upon tuning of the heteroatoms (Zn, Mn) doped in the aluminophosphate zeolite frameworks, CDs@zeolite composites with green and red phosphorescence have been prepared via in situ hydrothermal synthesis. In such composites, the zeolite matrix provides an efficient confinement role in stabilizing the triplet states of CDs. Significantly, the Mn-doped zeolite could act as an energy acceptor allowing EnT from excitons of CDs to the dopant in the host matrix, generating the intriguing red RTP behavior. This work provides an effective strategy for developing CD-based composite materials with special RTP emissions as well as new fields for applications.
由于激发态的非辐射衰减增加以及激发态与基态之间的能隙减小，具有红色发射室温磷光（RTP）的碳点（CDs）鲜有报道。在此，我们展示了一种简便的策略，可通过CDs-沸石体系中的供体-受体能量转移（EnT）来调节CDs的RTP特性。通过调节掺杂在磷酸铝沸石骨架中的杂原子（Zn、Mn），通过原位水热合成制备了具有绿色和红色磷光的CDs@沸石复合材料。在这种复合材料中，沸石基质在稳定CDs的三重态方面起到了有效的限制作用。值得注意的是，Mn掺杂的沸石可以作为能量受体，使CDs的激子将EnT转移到主体基质中的掺杂剂上，从而产生引人注目的红色RTP行为。这项工作为开发具有特殊RTP发射的基于CDs的复合材料提供了一种有效策略，以及新的应用领域。
