Molecular engineering of excited-state process for multicolor microcrystalline lasers

Abstract

Triplet accumulation strongly influences the performance of organic lasers and has deleterious effect on the development of the electrically pumped organic lasers. We have designed three strong emissive organic distyryl-framework molecules and obtained tricolor lasers based on their H-aggregate single microcrystals. Such a kind of H-type aggregation minimizes the reabsorption of emissive photons and benefits the buildup of laser. We systematically investigated the relationship between the laser behaviors and triplet population, indicating that the optimized energy level is of crucial importance for the development of organic gain materials. These three molecules possessing both the high gain and potential high carrier transport behaviors can be attractive candidates of organic laser materials for the electrically pumped organic laser and future integrated optoelectronic devices.