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].

© 2019 Japan Society of Applied Physics, The Optical Society (OSA)

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