DESIGN AND INVESTIGATION OF TADF CRYSTAL SURFACES DERIVED FROM CARBAZOLE AND PHENOXAZINE UNITS

Abstract

Strategic structural designs to develop optical devices using columnar liquid crystal (CLC) frameworks are highly sought after. In this study, we report a novel luminescent material with multiple donor-acceptor units, comprising carbazole and phenoxazine derivatives. The material’s aggregation-induced emission (AIE) and triboluminescent (TL) properties were evaluated within a single molecule. Powder X-ray structural analysis revealed the presence of both amorphous and crystalline phases. The optical properties were shown to be systematically tunable through regulation of the material’s aggregation state, particularly with metastable positioning when the carbazole derivative was substituted. This study demonstrates that unique multifunctional characteristics can be integrated into a single compound by finely controlling its aggregation states, presenting a new strategy for exploring multifunctional organic materials. Luminescence and external quantum efficiency values reached 21850 cdm^-2 and 4.7%, respectively.