Issue 8, 2021, Issue in Progress

Singlet fission from upper excited singlet states and polaron formation in rubrene film

Abstract

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 S2 state bypassing S1 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 S1 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.

Graphical abstract: Singlet fission from upper excited singlet states and polaron formation in rubrene film

Supplementary files

Article information

Article type
Paper
Submitted
23 Dec 2020
Accepted
14 Jan 2021
First published
22 Jan 2021
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 4639-4645

Singlet fission from upper excited singlet states and polaron formation in rubrene film

T. Wu, W. Ni, G. G. Gurzadyan and L. Sun, RSC Adv., 2021, 11, 4639 DOI: 10.1039/D0RA10780H

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