Metal Ions as the Third Component Coordinate with the Guest to Stereoscopically Enhance the Phosphorescence Properties of Doped Materials

The construction of multicomponent doped systems is an
important
direction for the development of phosphorescence materials. Herein,
benzophenone is selected as the host, phenylquinoline isomers are
designed as guests, and seven metal ions are selected as the third
component (Al3+, Cu+/2+, Zn2+, Ga3+, Ag+, Cd2+, and In3+) to
construct the three-component doped system. Ag+ and Cd2+ can considerably increase the emission intensity up to 38
times, and the highest phosphorescence quantum efficiency reaches
70%. Al3+, Ga3+, and In3+ can prolong
the emission wavelength, and the phosphorescence wavelength can be
red-shifted up to 60 nm. Cu2+, Ga3+, and In3+ can extend the phosphorescence lifetime by a maximum of
3.6 times. A series of experiments demonstrated that the coordination
of metals and guests is the key to improve the phosphorescence properties.
This work presents a simple and effective strategy to enhance the
phosphorescence properties of doped materials.