65309 20210121114451.0 doi 10.1021/acs.jpcc.5b06211 sideral 92344 ART-2015-92344 eng Yangui, A. Optical investigation of broadband white-light emission in self-assembled organic-inorganic Perovskite (c6h11nh3)2pbbr4 2015 Access copy available to the general public Unrestricted The 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. info:eu-repo/grantAgreement/ES/MINECO/MAT2013-44063-R info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 4.509 2015 CHEMISTRY, PHYSICAL 30 / 144 = 0.208 2015 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 39 / 271 = 0.144 2015 Q1 T1 NANOSCIENCE & NANOTECHNOLOGY 22 / 83 = 0.265 2015 Q2 T1 1.886 2015 Electronic, Optical and Magnetic Materials 2015 Q1 Energy (miscellaneous) 2015 Q1 Surfaces, Coatings and Films 2015 Q1 Physical and Theoretical Chemistry 2015 Q1 Nanoscience and Nanotechnology 2015 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Garrot, D. Lauret, J. S. Lusson, A. Bouchez, G. Deleporte, E. Pillet, S. Bendeif, E. E. (orcid)0000-0002-9687-4903 Castro, M. Universidad de Zaragoza Triki, S. Abid, Y. Boukheddaden, K. 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 119, 41 (2015), 23638-23647 J. phys. chem., C Journal of Physical Chemistry C 1932-7447 1752187 http://zaguan.unizar.es/record/65309/files/texto_completo.pdf Postprint 83959 http://zaguan.unizar.es/record/65309/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:65309 articulos driver 2021-01-21-10:46:23 ARTICLE