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. 2016 Apr 8;5(4):e16056. doi: 10.1038/lsa.2016.56

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Copyright © 2016 Changchun Institute of Optics, Fine Mechanics and Physics

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/

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(a) Streak camera data showing the time-resolved PL emission at 5 K. (b) PL spectra (with Gaussian fit) taken at different time delays after excitation. A is the PL spectrum at time=0; B is the PL spectrum taken from 5 to 7.5 μs. (c) Proposed energy level diagram for FAPbI3 perovskite at 5 K, involving a FE and a BE. (d) Power dependence of the time-resolved PL curve. BE, bound exciton; FAPbI₃, formamidinium lead iodide; FE, free exciton; PL, photoluminescence.