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30 March 2018 TIPS-anthracene: a singlet fission or triplet fusion material?
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Triisopropylsilylethynyl-substituted acenes (TIPS-acenes) have received prominent attention in the field of singlet fission, the pentacene derivative being an exothermic singlet fission material, and the tetracene being a prototypical endothermic material. Little attention has been given to TIPS-anthracene, which is expected to exhibit exothermic triplet–triplet annihilation, despite literature reports to the contrary. We show that there is some evidence for singlet fission in TIPS-anthracene solutions, and that it does exhibit triplet–triplet annihilation. We apply anti-Stokes action spectroscopy to determine the upconversion efficiency of a composition of TIPS-anthracene and platinum octaethylporphyrin. At a bias equivalent to 0.86 suns, the composition exhibited an annihilation efficiency of 3.2%, which may be compared to diphenylanthracene, which yielded 9.2% under the same conditions. We attribute the low efficiency to a combination of a shorter triplet lifetime and low lying T2 and T3 states. The results are supported by ab initio quantum chemical calculations.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE) 1947-7988/2018/$25.00 © 2018 SPIE
Jack Ka Hei Pun, Joseph K. Gallaher, Laszlo Frazer, Shyamal K. K. Prasad, Cameron B. Dover, Rowan W. MacQueen, and Timothy W. Schmidt "TIPS-anthracene: a singlet fission or triplet fusion material?," Journal of Photonics for Energy 8(2), 022006 (30 March 2018).
Received: 16 January 2018; Accepted: 2 March 2018; Published: 30 March 2018

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