In triplet-triplet annihilation based upconversion, high-energy photons are generated through the annihilation of fluorophore triplets, populated via energy transfer from a light-harvesting sensitizer. However, the absorption band of common sensitizers is narrow, limiting the fraction of recoverable photons. We overcome this issue using a third chromophore as an additional light-harvester in the transparency window between the upconverted luminescence and the sensitizer absorption. The third component transfers the extra-collected energy to sensitizers, realizing a cascade-sensitized upconversion that shows a 20% increment of the high-energy photon output and a conversion yield of 10% at solar irradiance.
Pedrini, J., Monguzzi, A., Meinardi, F. (2018). Cascade sensitization of triplet-triplet annihilation based photon upconversion at sub-solar irradiance. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 20(15), 9745-9750 [10.1039/c8cp01176a].
Cascade sensitization of triplet-triplet annihilation based photon upconversion at sub-solar irradiance
Pedrini, J;Monguzzi, A
;Meinardi, F
2018
Abstract
In triplet-triplet annihilation based upconversion, high-energy photons are generated through the annihilation of fluorophore triplets, populated via energy transfer from a light-harvesting sensitizer. However, the absorption band of common sensitizers is narrow, limiting the fraction of recoverable photons. We overcome this issue using a third chromophore as an additional light-harvester in the transparency window between the upconverted luminescence and the sensitizer absorption. The third component transfers the extra-collected energy to sensitizers, realizing a cascade-sensitized upconversion that shows a 20% increment of the high-energy photon output and a conversion yield of 10% at solar irradiance.
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