Realization of Single-Phase White-Light-Emitting Materials with Time-Evolution Ultralong Room-Temperature Phosphorescence by Coordination Assemblies

作者：Liu, Hui; Zhang, Kun; Gao, Peng-Fu; Luo, Jia-Hua; Jiang, Yu-Ying; Zhou, Meng-Shu; Li, Ting; Zhu, Xue-Li; Fu, Hong-Ru^*

来源：Inorganic Chemistry, 2022, 61(3): 1636-1643.

DOI：10.1021/acs.inorgchem.1c03461

• ORGANIC PHOSPHORESCENCE
• FLUORESCENCE
• LUMINESCENCE
• EMISSION
• COLOR

Two Cd-based supramolecular coordination polymers, [Cd-3(CzIP)3(DMF)(2)] (1) and [Cd-2(CzIP)(2)(DMF)(4)] (2), were synthesized by using 5-(carbazol-9-yl) isophthalate (CzIP) as ligands. These two compounds exhibit multiple luminescence emissions; apart from fluorescence, time- and temperature-dependent ultralong phosphorescence (RTP) were also achieved under room conditions. Significantly, compound 1 has a long-lived afterglow of 0.93 s at 545 nm under ambient conditions. Compound 2 shows nearly pure white-light emission with CIE coordinates of (0.33, 0.33) via the dual emission of fluorescence and phosphorescence. It has come to our attention that it is the first example of a luminescent coordination polymer with single-phase white-light emission and color-evolution RTP. In addition, the long-lived RTP materials can be used in time-dependent anticounterfeiting and white-light-emitting diodes. Experimental and singlet and triplet state calculations indicate that both C-H center dot center dot center dot pi interaction and inter- and intramolecular charge transfer interactions could be beneficial to the emission of ultralong RTP.