title: Highly emissive nanostructured thin films of organic host-guests for energy conversion.
abstract: All-organic nanostructured host-guest systems, based on dyes inserted in the nanochannels of perhydrotriphenylene (PHTP) and deoxycholic acid (DCA), show enhanced fluorescence properties with quantum yields even higher than those of the dyes in solution, thanks to the high concentration of emissive molecules with controlled spatial and geometrical organization that prevents aggregation quenching. Both host molecules crystallize, growing with the long axis oriented along the direction of the nanochannels where the linear-chain dyes are inserted, to yield crystals emitting well-polarized light. For the DCA-based host-guests, homogeneous thin films suitable for several applications are obtained. Colour emission in such films can be tuned by co-inclusion of two or three dyes due to resonant energy-transfer processes. We show that films obtained by low-cost techniques, such as solution casting and spin-coating, convert UV light into visible light with an efficiency much higher than that of the standard polymeric blends.
authors.affiliation: Dipartimento di Chimica Organica e Industriale, Università di Milano, Via Venezian 21, 20133 Milano, Italy.
authors.forename: Juliette
authors.initials: J
authors.lastname: Moreau
authors.forename: Umberto
authors.initials: U
authors.lastname: Giovanella
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Bombenger
authors.forename: William
authors.initials: W
authors.lastname: Porzio
authors.forename: Varun
authors.initials: V
authors.lastname: Vohra
authors.forename: Laura
authors.initials: L
authors.lastname: Spadacini
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Di Silvestro
authors.forename: Luisa
authors.initials: L
authors.lastname: Barba
authors.forename: Gianmichele
authors.initials: G
authors.lastname: Arrighetti
authors.forename: Silvia
authors.initials: S
authors.lastname: Destri
authors.forename: Mariacecilia
authors.initials: M
authors.lastname: Pasini
authors.forename: Michele
authors.initials: M
authors.lastname: Saba
authors.forename: Fancesco
authors.initials: F
authors.lastname: Quochi
authors.forename: Andrea
authors.initials: A
authors.lastname: Mura
authors.forename: Giovanni
authors.initials: G
authors.lastname: Bongiovanni
authors.forename: Mauro
authors.initials: M
authors.lastname: Fiorini
authors.forename: Michela
authors.initials: M
authors.lastname: Uslenghi
authors.forename: Chiara
authors.initials: C
authors.lastname: Botta