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)
Jack Ka Hei Pun, Jack Ka Hei Pun, Joseph K. Gallaher, Joseph K. Gallaher, Laszlo Frazer, Laszlo Frazer, Shyamal K. K. Prasad, Shyamal K. K. Prasad, Cameron B. Dover, Cameron B. Dover, Rowan W. MacQueen, Rowan W. MacQueen, Timothy W. Schmidt, Timothy W. Schmidt, } "TIPS-anthracene: a singlet fission or triplet fusion material?," Journal of Photonics for Energy 8(2), 022006 (30 March 2018). https://doi.org/10.1117/1.JPE.8.022006 . Submission: Received: 16 January 2018; Accepted: 2 March 2018
Received: 16 January 2018; Accepted: 2 March 2018; Published: 30 March 2018

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