Emission properties and basic photophysics of polymer | Marco Anni |
Summary :
The combination of lead halide perovskites nanocrystals (NCs) and conjugated polymer in a blend film opens the way to the realization of hybrid active layers with widely tunable optical and electrical properties, able to combine the best properties of both families. We investigated the emission properties of different polymer:perovskite NCs blends, evidencing that these hybrid films show photoluminescence spectra made by the linear superposition of the spectra of the components. This feature opens the way to the use of these blends as light emitting systems with broadly tunable emission color, including white emission. Moreover we investigated the interaction between the polymeric and the perovskite component, mainly unexplored to date, of a poly(9,9-dioctylfluoreneco- benzothiadiazole )(F8BT):CsPbI1:5Br1:5 nanocrystals hybrid film. We demonstrate that the primary interaction channel is charge transfer, both from F8BT to the NCs and from the NCs to F8BT, while Förster Resonant Energy Transfer has not visible effects, despite the excellent spectral overlap between F8BT emission and NCs absorption. Moreover we show that the charge transfer is assisted by energy migration within the F8BT excited states distribution and that it is dependent on the local micromorphology of the film. The possible relevance of our results for the development of hybrid organic-perovskite optoelectronic devices will be discussed.
About Author ;
Marco Anni is Associate Professor of Experimental Physics at the University of Salento, Lecce (Italy). He graduated in Physics in 1998 and he obtained the title of Philosophy Doctor in Physics in 2001, both from the University of Lecce. From 2006 he heads the Photonic Laboratory of the Dipartimento di Matematica e Fisica “Ennio De Giorgi”. The research activity of the laboratory is focused on the investigation of the optical properties of innovative materials for applications in lasers, sensors and solar cells. He has authored more than 120 publications in international journals, two books and has co-authored 4 patents.
