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

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• 作者：A. Yangui ; D. Garrot ; J. S. Lauret ; A. Lusson ; G. Bouchez ; E. Deleporte ; S. Pillet ; E. E. Bendeif ; M. Castro ; S. Triki ; Y. Abid ; K. Boukheddaden
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：October 15, 2015
• 年：2015
• 卷：119
• 期：41
• 页码：23638-23647
• 全文大小：648K
• ISSN：1932-7455

文摘

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 鈭?0 meV.