Cascade sensitization of triplet–triplet annihilation based photon upconversion at sub-solar irradiance. Issue 15 (3rd April 2018)

• Record Type: Journal Article
• Authors: Pedrini, Jacopo; Monguzzi, Angelo; Meinardi, Francesco
• Is Part Of: Physical chemistry chemical physics. Volume 20:Issue 15(2018)
• Page Start: 9745
• Page End: 9750
• Publication Date: 2018-04-03
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c8cp01176a
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Cascade sensitization of optically dark triplets allows to increase by 20% the light output in triplet–triplet annihilation based photon upconversion. 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.