Long-range coupling of electron-hole pairs in spatially separated organic donor-acceptor layers.

ABSTRACT: Understanding exciton behavior in organic semiconductor molecules is crucial for the development of organic semiconductor-based excitonic devices such as organic light-emitting diodes and organic solar cells, and the tightly bound electron-hole pair forming an exciton is normally assumed to be localized on an organic semiconducting molecule. We report the observation of long-range coupling of electron-hole pairs in spatially separated electron-donating and electron-accepting molecules across a 10-nanometers-thick spacer layer. We found that the exciton energy can be tuned over 100 megaelectron volts and the fraction of delayed fluorescence can be increased by adjusting the spacer-layer thickness. Furthermore, increasing the spacer-layer thickness produced an organic light-emitting diode wi

SUBMITTER: Nakanotani H 

PROVIDER: S-EPMC4771443 | biostudies-literature | 2016 Feb

REPOSITORIES: biostudies-literature