Activating Solid-State Triplet–Triplet Annihilation Upconversion via Bulky Annihilators

Triplet-triplet annihilation (TTA) upconversion (UC), a process converting two low-energy photons into one of higher energy, has numerous promising applications. Commonly, TTA-UC systems consist of a sensitizer, which absorbs low-energy radiation, and an annihilator, responsible for TTA and emission of high-energy radiation. Despite the fact that solid-state operation is essential for many of the most attractive applications of TTA-UC, most studies on annihilator properties have been performed in solution. Here, we develop a strategy to activate solid-state TTA-UC in materials previously shown to undergo singlet fission such as diketopyrrolopyrroles (DPPs) and dipyrrolonaphthyridinediones (DPNDs). Furthermore,…

• UO
  University of California, San Diego