Molecular Orientations of Delayed Fluorescent Emitters in a Series of Carbazole-Based Host Materials.

ABSTRACT: Molecular orientation is one of the most crucial factors to boost the efficiency of organic light-emitting devices. However, active control of molecular orientation of the emitter molecule by the host molecule is rarely realized so far, and the underlying mechanism is under discussion. Here, we systematically investigated the molecular orientations of thermally activated delayed fluorescence (TADF) emitters in a series of carbazole-based host materials. Enhanced horizontal orientation of the TADF emitters was achieved. The degree of enhancement observed was dependent on the host material used. Consequently, our results indicate that π-π stacking, CH/n (n = O, N) weak hydrogen bonds, and multiple CH/π contacts greatly induce horizontal orientation of the TADF emitters in addition to the mol

SUBMITTER: Sasabe H 

PROVIDER: S-EPMC7262557 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature