Two-photon-excited ultralong organic room temperature phosphorescence by dual-channel triplet harvesting.

ABSTRACT: Due to inefficient molecular design strategies, two-photon-excited ultralong organic room temperature phosphorescence (TPUOP) has not yet been reported in single-component materials. Herein, we present an innovative design method by dual-channel triplet harvesting to obtain the first bright TPUOP molecule with a lifetime of 0.84 s and a quantum efficiency of 16.6%. In compound o-Cz the donor and acceptor units are connected at the ortho position of benzophenone, showing intramolecular space charge transfer. Therefore, the two-photon absorption ability is improved due to the enhanced charge transfer character. Moreover, the small energy gap boosts dual-channel triplet harvesting via ultralong thermally activated delayed fluorescence and H-aggregation phosphoresce

SUBMITTER: Mao Z 

PROVIDER: S-EPMC6713867 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature