摘要
Long afterglow organic-inorganic hybrid materials have attracted much attention in recent years and are widely used in information security, biological imaging and many other fields. Since up-conversion long-persistence materials are promising for bio-optical imaging due to their high penetration depth and elimination of autofluorescence background, it is highly desirable to combine down-conversion and up-conversion pathways to obtain smart materials with excitation-dependent tunable room-temperature phosphorescence properties. In this work, a metal-organic framework(Zn-DCPS-BIMB), consisting of divalent zinc ions, o-bis(imidazol-1-ylmethyl)benzene and 4,4-dicarboxydiphenylsulfone, is designed to stabilize triplet excitons, coordinate the emission of different ligands, and endow materials with tunable emission color and up-conversion properties via heavy atoms effects promoting single-triplet orbital coupling and intersystem crossing.
基金
supported by the Beijing Municipal Natural Science Foundation (No. JQ20003)
the National Natural Science Foundation of China (Nos. 21771021, 21822501 and 22061130206)
the Newton Advanced Fellowship award (No. NAFR1201285)
the Fok Ying-Tong Education Foundation (No. 171008)
the Measurements Fund of Beijing Normal University
the State Key Laboratory of Heavy Oil Processing。