Color-Tunable Long-Lived Room-Temperature Phosphorescence in a Coordination Polymer Based on a Nonaromatic Ligand and Its Phosphor/Coordination Polymer-Doped Systems

Long-lived room-temperature phosphorescence (RTP) from coordination polymers has attracted considerable attention owing to their intensive applications in diverse fields. However, the reported compounds are all based on aromatic ligands. Here, we report a two-dimensional RTP coordination polymer (1) based on a nonconventional nonaromatic ligand. It is facilely synthesized by recrystallizing calcium acetate in dimethyl sulfoxide (DMSO) solvent and has a blue-green RTP with a lifetime of 534.64 ms. The density of carboxyl groups is considered to be an important factor in affecting the RTP properties of such coordination polymers based on nonaromatic carboxyl ligands. In addition, the RTP emission of such nonconventional RTP materials is proved to be tunable by trace doping of organic phosphors. Blue, green, yellow, and orange RTP emissions with durations of 3-7 s can be obtained by doping different phosphors into 1. Finally, lifetime-encoding application is successfully performed using the doped systems. The work not only greatly expands the range of ligands that can be used to construct RTP coordination polymers but also achieves a wide range of adjustments to the RTP emission color of nonconventional RTP materials.