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

Journal Article · 02 July 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]; Wu, Qin  ^[2]; Wu, Di ^[1]; Sfeir, Matthew Y. ^[1]; Xia, Jianlong ^[1]

---

1. Wuhan Univ., Wuhan (China); City Univ. (CUNY), NY (United States)
2. 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.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: SC0012704
• OSTI ID: 1543399
• Report Number(s): BNL--211849-2019-JAAM
• Journal Information: Chem, Journal Name: Chem Journal Issue: 9 Vol. 5; ISSN 2451-9294
• Publisher: Cell Press, ElsevierCopyright Statement
• Country of Publication: United States
• Language: English