A Novel Design Strategy for Suppressing Efficiency Roll-Off of Blue Thermally Activated Delayed Fluorescence Molecules through Donor-Acceptor Interlocking by C-C Bonds.

ABSTRACT: The short material lifetime of thermally activated delayed fluorescence (TADF) technology is a major obstacle to the development of economically feasible, highly efficient, and durable devices for commercial applications. TADF devices are also hampered by insufficient operational stability. In this paper, we report the design, synthesis, and evaluation of new TADF molecules possessing a sterically twisted skeleton by interlocking donor and acceptor moieties through a C-C bond. Compared to C-N-bond TADF molecules, such as CPT2, the C-C-bond TADF molecules showed a large dihedral angle increase by more than 30 times and a singlet-triplet energy-gap decrease to less than 0.22 eV because of the steric hindrance caused by the direct C-C bond connection. With the introduction of a dibenzofuran c

SUBMITTER: Kwon TH 

PROVIDER: S-EPMC6956325 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature