Achieving Long-Lived Triplet States in Intramolecular SF Films through Molecular Engineering

Huang, Huaxi; He, Guiying; Xu, Ke; Wu, Qin; Wu, Di; Sfeir, Matthew Y.; Xia, Jianlong

doi:10.1016/j.chempr.2019.06.007

Title: Achieving Long-Lived Triplet States in Intramolecular SF Films through Molecular Engineering

Journal Article · Wed Jul 03 00:00:00 EDT 2019 · Chem

DOI:https://doi.org/10.1016/j.chempr.2019.06.007· OSTI ID:1543399

Huang, Huaxi ^[1]; He, Guiying ^[1]; Xu, Ke ^[1];

^[2]; Wu, Di ^[1]; Sfeir, Matthew Y. ^[1]; Xia, Jianlong ^[1]

Wuhan Univ., Wuhan (China); City Univ. (CUNY), NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Tuning singlet fission (SF) dynamics in the solid states in a controllable way is vitally important yet still a challenge due to the electronic coupling, which is highly sensitive to molecular packing. Here, we demonstrate a molecular engineering approach to independently optimize the triplet generation and decay process in intramolecular SF films by using terphenyl-bridged TIPS-pentacene tetramers. By controlling the degree of steric hindrance within individual tetramers, we can systematically tune the degree of intermolecular coupling in thin films. Taking advantage of both the intra- and intermolecular SF processes allows us to maintain a rapid triplet pair generation process, even in the case of weak intermolecular coupling. This approach allows us to maintain a picosecond triplet generation process while simultaneously varying the rate constants for triplet-triplet annihilation over three orders of magnitude.

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