Cross Dipole Stacking in the Crystal of Distyrylbenzene Derivative:The Approach toward High Solid-State Luminescence Efficiency

摘要

Poly(p-phenylene vinylene)(PPV)-type polymers and oligomers have attracted more attention as luminescent materials due to their applications in organic light-emitting diodes(OLEDs)and lasers.However,H-aggregation that exists widely in such pi-conjugated compounds dramatically decreases the luminescence quantum yield upon going from dilute blends or solutions to films.The most efficient configuration to prevent any decrease in luminescence efficiency,prefigured by theoretical investigations in the clusters of conjugated molecules,is to adjust the long axes of adjacent chains to be perpendicular in condensed media.