Triplet-fusion-based photon upconversion is promising for photovoltaic or bioimaging applications, but its efficiency is limited by triplet fusion spin dependence. Here, the authors tailor spin dynamics by engineering the crystal structure with metal–organic frameworks to enable effective spin mixing between singlet and quintet triplet–triplet pair states.
- Dong-Gwang Ha
- Ruomeng Wan
- Mircea Dincă
