期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 41, 页码 23638-23647出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b06211
关键词
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资金
- PHC MAGHREB program [13MAG08, 30255ZJ]
- Agence Nationale de la Recherche (ANR project BISTA-MAT) [ANR-12-BS07-0030-01]
- Spanish MINECO [MAT2013-44063-R]
- Universite de Versailles Saint-Quentin-En-Yvelines
- CNRS
- Universite de Sfax
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.
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