Chinese scholars and overseas collaborators have made progress in the research of molecular state high-efficiency blue room temperature phosphorescence

The phosphorescence produced by organic materials at room temperature has the characteristics of long life, large Stokes shift, etc.
, and has broad application scenarios in biological imaging, organic light-emitting diodes, and optical switches
.
Crystal engineering is considered to be the most effective strategy to improve room temperature phosphorescence performance

In response to this problem, the research team proposed a "chromophore confinement" strategy, and constructed organic ion crystal materials with molecular state and high-efficiency room-temperature phosphorescence to achieve high-efficiency and long-life blue room-temperature phosphorescence
.
Studies have found that the use of strong ionic bonds and the isolated confinement of counter ions on molecular state chromophores is the key to achieving high-efficiency blue room temperature phosphorescence

This research is of great significance for understanding the structure-activity relationship between the molecular structure, stacking mode and luminescence properties of organic phosphorescent materials, and lays a foundation for the application of organic room temperature phosphorescent materials

Figure 1 (a) "Chromophore confinement" model based on ionic bonds; (b) Steady-state photoluminescence and phosphorescence spectra of TSP ionic crystals; (c) Confinement environment of isolated chromophores in the crystal; ( df) Application demonstration of anti-counterfeiting, fingerprint recognition and afterglow display