Journal
RSC ADVANCES
Volume 11, Issue 8, Pages 4639-4645Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ra10780h
Keywords
-
Categories
Funding
- DUT startup grant
- DUT basic research funding [DUT18GJ205]
Ask authors/readers for more resources
Femtosecond fluorescence up-conversion and transient absorption pump-probe setups were used to study the relaxation dynamics of the lower and upper excited singlet electronic states in rubrene films, revealing accelerated singlet fission and polaron formation compared to the S-1 state. This finding could significantly expand the applications of rubrene in organic electronics and provide a new direction for synthesizing novel materials with optimized excited state properties for organic photovoltaic applications.
Femtosecond fluorescence up-conversion and transient absorption pump-probe setups are applied to study the relaxation dynamics of the lower and upper excited singlet electronic states in easy-to-make rubrene films. Upon 250 nm (4.96 eV) excitation, singlet fission was observed directly from S-2 state bypassing S-1 state within 30 fs i.e. breaking the classical Kasha rule. From the transient absorption measurements, polaron formation was also detected on the same time scale. Both singlet fission and polaron formation are accelerated from upper excited states compared with S-1 state. Our work shows that rubrene films with low degree of crystallinity could display efficient singlet fission, notably in the case of excitation to upper lying electronic states. This can strongly expand the applications of rubrene in organic electronics. Moreover, our results will provide a new direction for synthesizing novel materials with optimized excited state properties for organic photovoltaic applications.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available