Excited state dynamics is a central issue in discussing the origin of the high efficiency of thermally activated delayed fluorescence (TADF) molecules. Here we will present experimentally a complexity of the excited state dynamics of the extremely high efficient TADF molecules, 4CzIPN. By means of pump-probe transient absorption spectroscopy, we will show the sign of intramolecular charge delocalization formed in the excited state. This specific excited state originates from the intramolecular charge resonance within carbazole moieties, which occurs through the dimerization of the moieties. On the other hand, the counter molecules of 4CzIPN, i.e. 2CzPN, forms only a localized excited state. The role of charge delocalized state for TADF efficiency will be discussed.
|Number of pages
|Digest of Technical Papers - SID International Symposium
|Published - 2016
|54th Annual SID Symposium, Seminar, and Exhibition 2016, Display Week 2016 - San Francisco, United States
Duration: May 22 2016 → May 27 2016
All Science Journal Classification (ASJC) codes
- General Engineering