Using light to control matter has captured the imagination of scientists for generations, as
there is an abundance of photons at our disposal. Yet delivering photons beyond the surface …

The recent advances of upconversion nanoparticles (UCNPs) have made them the ideal
“partner” for a variety of biological applications. In this review, we describe the emerging …

Photon upconversion (UC), the process of combining two or more low-energy photons to
generate a higher-energy excited state, is of interest for applications ranging from imaging to …

Triplet–triplet annihilation upconversion (TTA-UC) has been attracting attention in various
fields as a promising tool to efficiently generate a shorter-wavelength photon than incident …

Photochemical upconversion is a process whereby two lower-energy photons are converted
into a higher-energy photon by sensitized triplet–triplet annihilation. While recent interest in …

Triplet–triplet annihilation upconversion (TTA-UC) has great potential to significantly
improve the light harvesting capabilities of photovoltaic cells and is also sought after for …

Solar energy harvesting is among the best solutions for a global transition toward carbon-
neutral energy technologies. The existing solar energy harvesting technologies like …

While many studies have been done on triplet–triplet annihilation‐based photon
upconversion (TTA‐UC) to produce visible light with high efficiency, the efficient TTA‐UC …

Owing to its unique ability to efficiently convert low-energy photons into high-energy
photons, triplet–triplet annihilation (TTA) based photon upconversion is a promising strategy …

Advancing the upconversion materials field relies on accurate and contrastable
photoluminescence efficiency measurements, which are characterised by the absolute …