title: Achieving the photon up-conversion thermodynamic yield upper limit by sensitized triplet-triplet annihilation.
abstract: Triplet-triplet annihilation (TTA) based up-conversion is a promising strategy for light harvesting the low-energy tail of the solar spectrum with photovoltaic technologies. Here, we present a bi-component system for photon managing via TTA that allows bypassing the classical statistic limit of 2/5 in the singlet generation, achieving a near unitary conversion efficiency. This result is obtained because of the peculiar relative position of the triplet and singlet energy levels of perylene, used as up-converter and emitter. The system shows a record red-to-blue external up-conversion yield of ∼10% under an irradiance of 1 sun.
authors.affiliation: Dipartimento di Scienza dei Materiali, Università of Milano-Bicocca, via Cozzi 55, I-20125 Milano, Italy. angelo.monguzzi@mater.unimib.it.
authors.forename: S
authors.initials: S
authors.lastname: Hoseinkhani
authors.forename: R
authors.initials: R
authors.lastname: Tubino
authors.forename: F
authors.initials: F
authors.lastname: Meinardi
authors.forename: A
authors.initials: A
authors.lastname: Monguzzi