All photovoltaic solar cells transmit photons with energies below the absorption threshold
(bandgap) of the absorber material, which are therefore usually lost for the purpose of solar …

Extensive literature and publications on intermediate band solar cells (IBSCs) are reviewed.
A detailed discussion is given on the thermodynamics of solar energy conversion in IBSCs …

This perspective article provides a comprehensive but organized tutorial introduction of the
kinetics related to photon upconversion (UC) by triplet–triplet annihilation (TTA)(TTA-UC) …

Photochemical upconversion based on triplet–triplet annihilation (TTA-UC) is employed to
enhance the short-circuit currents generated by two varieties of thin-film solar cells, a …

Reversible photoswitched triplet–triplet annihilation upconversion (TTA UC) was
demonstrated with dithienylethene (DTE) derivatives as the photochromic units, 2, 6 …

Highlights•Mechanism of TTA-UC.•Development of sensitizer and activator.•Host material
development.•Bioimaging and biodetection with TTA-UC.Upconversion of light has attracted …

The performance of a perylene monoimide annihilator is evaluated in a photochemical
upconversion composition. It is found to perform up to five times better than the commonly …

Plasmonics has been used to enhance light–matter interaction at the extreme
subwavelength scale. Intriguingly, it is possible to achieve multiple plasmonic resonances …

Photon upconversion (UC) is a technology that can increase solar utilization efficiencies in
broad photoenergy conversion systems by converting lower-energy photons into usable …

Photon upconversion based on triplet–triplet annihilation (TTA-UC) is a technology to
convert presently wasted sub-bandgap photons to usable higher-energy photons. In this …