Near-infrared-to-visible photon upconversion via triplet-triplet annihilation of a solid-state system fabricated by rapid drying casting

Photon upconversion is a photophysical process of two low-energy long-wavelength photons into a high-energy photon of a shorter wavelength. Among the various methods, triplet-triplet annihilation photon upconversion (TTA-UC) have attracted substantial interest due to its potential applications in a variety of novel and active research fields, such as spectral management of sunlight for solar cells and cancer bioimaging in vivo [1].