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.