Low power, non-coherent sensitized photon up-conversion: modelling and perspectivesElectronic supplementary information (ESI) available. See DOI: 10.1039/c2cp23900k
In the last few years, non-coherent sensitized photon up-conversion (SUC) in multi-component systems has been developed to achieve significantly high quantum yields for various chromophore combinations at low excitation powers, spanning from the ultraviolet (UV) to near infrared (NIR) spectrum. This...
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Abstract | In the last few years, non-coherent sensitized photon up-conversion (SUC) in multi-component systems has been developed to achieve significantly high quantum yields for various chromophore combinations at low excitation powers, spanning from the ultraviolet (UV) to near infrared (NIR) spectrum. This promising photon energy management technique became indeed suitable for wide applications in lighting technology and especially in photovoltaics, being able to recover the sub-bandgap photons lost by current devices. A full and general description of the SUC photophysics will be presented, with the analysis of the parameter affecting the photon conversion quantum yield and the quantities which define the optimal working range of any SUC system, namely the threshold and saturation excitation intensity. It will be shown how these quantities depend on intrinsic photophysical properties of the moieties involved and on the SUC solid host matrix. The model proposed represents a powerful tool for evaluation of a newly proposed system, and its reliability will be discussed in respect to an optimized system with SUC yield of 0.26 0.02. The results obtained will outline the research guidelines which must be pursued to optimize the SUC efficiency for its perspective technological applications.
Sensitized green to blue up-converted photoluminescence in a PtOEP/DPA donor/acceptor system and outline of the energy levels involved in the conversion process. |
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AbstractList | In the last few years, non-coherent sensitized photon up-conversion (SUC) in multi-component systems has been developed to achieve significantly high quantum yields for various chromophore combinations at low excitation powers, spanning from the ultraviolet (UV) to near infrared (NIR) spectrum. This promising photon energy management technique became indeed suitable for wide applications in lighting technology and especially in photovoltaics, being able to recover the sub-bandgap photons lost by current devices. A full and general description of the SUC photophysics will be presented, with the analysis of the parameter affecting the photon conversion quantum yield and the quantities which define the optimal working range of any SUC system, namely the threshold and saturation excitation intensity. It will be shown how these quantities depend on intrinsic photophysical properties of the moieties involved and on the SUC solid host matrix. The model proposed represents a powerful tool for evaluation of a newly proposed system, and its reliability will be discussed in respect to an optimized system with SUC yield of 0.26 0.02. The results obtained will outline the research guidelines which must be pursued to optimize the SUC efficiency for its perspective technological applications.
Sensitized green to blue up-converted photoluminescence in a PtOEP/DPA donor/acceptor system and outline of the energy levels involved in the conversion process. |
Author | Tubino, Riccardo Hoseinkhani, Sajjad Campione, Marcello Monguzzi, Angelo Meinardi, Francesco |
AuthorAffiliation | Dipartimento di Scienze Geologiche e Geotecnologie Universit Milano Bicocca Dipartimento di Scienza dei Materiali |
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Notes | After his Physics degree at the University of Milano (1992), Francesco Meinardi earned a master in Material Science and Technology (1995), and in 1999 obtained a researcher position in Experimental Physics at the Milano-Bicocca University where he is a professor of Physics of Matter from 2005. His present research activity is focused on photophysics of organic materials. Main research topics include: cooperative effects in organic semiconductors, photophysics of conjugated oligomers, hostguest compound, organolanthanide complexes. He published more than 130 papers in international journals, and in 2007 organized the fourth edition of the European conference on organic electronic and related phenomena. Sajjad Hoseinkhani has received his PhD in physics from the Politecnico di Milano in 2010. During his PhD, he studied the photophysics and excited state dynamics of the conjugated carbon materials especially carbon nanotubes with extreme temporal resolution by ultra-short femtosecond Pump-Probe Spectroscopy. He is currently a post-doctoral researcher at Material Science Department in the Bicocca University of Milan, where his research activity deals with photoluminescence spectroscopy, focusing on photon up-conversion by triplettriplet annihilation in organic systems. Riccardo Tubino is a full professor of Physics at the University of Milano-Bicocca. His scientific activity is focused on the optical properties of organic semiconductors, photophysical properties of light harvesting materials and novel infrared light sources. He is an author of over 200 articles published on the most relevant Physics and Material Science journals. Since his PhD in Materials Science: Nanostructured Materials in 2005, Marcello Campione has been working on the study of the growth dynamics and structural properties of thin films of molecular organic semiconductors using scanning probe microscopy, transmission electron microscopy, and X-ray diffraction methods. Since 2009 he is a Permanent Researcher in Experimental Physics at the Universit di Milano Bicocca. His main scientific interests are the analysis of the microscopic growth mechanism of molecular organic thin films by scanning probe techniques, the study of organicorganic epitaxy, and the growth of single crystals of organic semiconductors for device applications. Angelo Monguzzi is a post-doc fellow at the University of Milano Bicocca, where he graduated in Physics in 2005 and obtained his PhD in Materials Science in 2008. In 2009 he got the prize for Young Researcher Communication of the Societ Italiana di Fisica. During his PhD he focused his scientific activity on photophysical properties of organic materials for photonics and optoelectronics. He published 30 scientific papers in the most relevant Physics, Chemistry and Materials Science international journals. From 2007 he started his study of sensitized up-conversion, actually the main topic of his work. Electronic supplementary information (ESI) available. See DOI 10.1039/c2cp23900k |
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