doi:10.1021/acs.jpcc.5b06211engYangui, A.Garrot, D.Lauret, J. S.Lusson, A.Bouchez, G.Deleporte, E.Pillet, S.Bendeif, E. E.Castro, M.Triki, S.Abid, Y.Boukheddaden, K.Optical investigation of broadband white-light emission in self-assembled organic-inorganic Perovskite (c6h11nh3)2pbbr4ART-2015-92344The performance of hybrid organic perovskite (HOP) for solar energy conversion is driving a renewed interest in their light emitting properties. The recent observation of broad visible emission in layered HOP highlights their potential as white-light emitters. Improvement of the efficiency of the material requires a better understanding of its photophysical properties. We present in-depth experimental investigations of white-light (WL) emission in thin films of the (C6H11NH3)2PbBr4. The broadband, strongly Stokes shifted emission presents a maximum at 90 K when excited at 3.815 eV, and below this temperature coexists with an excitonic edge emission. X-rays and calorimetry measurements exclude the existence of a phase transition as an origin of the thermal behavior of the WL luminescence. The free excitonic emission quenches at low temperature, despite a binding energy estimated to 280 meV. Time-resolved photoluminescence spectroscopy reveals the multicomponent nature of the broad emission. We analyzed the dependence of these components as a function of temperature and excitation energy. The results are consistent with the existence of self-trapped states. The quenching of the free exciton and the thermal evolution of the WL luminescence decay time are explained by the existence of an energy barrier against self-trapping, estimated to -10 meV.2015http://zaguan.unizar.es/record/6530910.1021/acs.jpcc.5b06211http://zaguan.unizar.es/record/65309oai:zaguan.unizar.es:65309info:eu-repo/grantAgreement/ES/MINECO/MAT2013-44063-RJournal of Physical Chemistry C 119, 41 (2015), 23638-23647All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess