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Optical Investigation of Broadband White-Light Emission in Self-Assembled Organic-Inorganic Perovskite (C6H11NH3)(2)PbBr4

Sujet: [CHIM.CRIS] Chemical Sciences/Cristallography
Auteur: Yangui, A., Garrot, Damein, Lauret, J. S., Lusson, A., Bouchez, G., Deleporte, E., Pillet, Sébastien, Bendeif, El-Eulmi, Castro, M., Triki, S., Abid, Younes, Boukheddaden, K.
Résumé: 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)(2)PbBr4. 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 similar to 10 meV.
Source: info:eu-repo/semantics/altIdentifier/doi/10.1021/acs.jpcc.5b06211
Editeur: HAL CCSD, American Chemical Society