Photophysics of self-assembled luminophore-perovskite systems

During the past few years hybrid organic-inorganic perovskites (HOIPs) have attracted much interest as solution-processed semiconductors with high potentialities in optoelectronics. On the one hand “3D” HOIPs such as CH3NH3PbI3 have shown their outstanding performances when incorporated in solar cells [1]. On the other hand their “2D layered” counterparts (R-NH3)2PbI4, where R is an organic group, are promising materials for light emitting devices such as LEDs [2] and Lasers [3]. Indeed their self-assembled, multilayered structure allows strong excitonic emission at room temperature (fig. 1). They offer moreover much flexibility with respect to the organic group R. While most of the reported 2D layered perovskites have optically inactive organic moieties, a huge improvement of the performances could be done by introducing functional organic groups. This is why we propose in the present work two innovative luminophore-perovskite systems. First by introducing 2,3-naphthalimide-ethylammonium (NAAB) fluorescent molecules in the perovskite structure we efficiently improved its excitonic emission [4]. Secondly thanks to the perovskite self-assembling we succesfully templated tetrazine molecules into the perovskite structure and changed their optical properties (fig. 2).