Orientation distributions of vacuum-deposited organic emitters revealed by single-molecule microscopy.

ABSTRACT: The orientation of luminescent molecules in organic light-emitting diodes strongly influences device performance. However, our understanding of the factors controlling emitter orientation is limited as current measurements only provide ensemble-averaged orientation values. Here, we use single-molecule imaging to measure the transition dipole orientation of individual emitter molecules in a state-of-the-art thermally evaporated host and thereby obtain complete orientation distributions of the hyperfluorescence-terminal emitter C545T. We achieve this by realizing ultra-low doping concentrations (10^-6 wt%) of C545T and minimising background levels to reliably measure its photoluminescence. This approach yields the orientation distributions of >1000 individual emitter molecules in a

SUBMITTER: Tenopala-Carmona F 

PROVIDER: S-EPMC10543598 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature