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Updated: Sep 29, 2025

Triplet Fusion Upconversion Nanocapsule Synthesis
Published on: September 7, 2022
Exploring a new class of singlet fission fluorene derivatives with high-energy triplets
Letizia Mencaroni1, Benedetta Carlotti1, Fausto Elisei1
1Department of Chemistry Biology and Biotechnology and CEMIN, University of Perugia via elce di sotto n. 8, 06123 Perugia Italy benedetta.carlotti@unipg.it.
Abstract:
In this study, we report strong experimental evidence for singlet fission (SF) in a new class of fluorene-based molecules, exhibiting two-branched donor-acceptor structures. The time-resolved spectroscopic results disclose ultrafast formation of a double triplet state (occurring in few picoseconds) and efficient triplet exciton separation (up to 145% triplet yield). The solvent polarity effect and the role of intramolecular charge transfer (ICT) on the SF mechanism have been thoroughly investigated with several advanced spectroscopies. We found that a stronger push-pull character favors SF, as long as the ICT does not act as a trap by opening a competitive pathway. Within the context of other widely-known SF chromophores, the unconventional property of generating high-energy triplet excitons (ca. 2 eV) via SF makes these materials outstanding candidates as photosensitizers for photovoltaic devices.
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