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. 2017 Mar 28;7:45391. doi: 10.1038/srep45391

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(a) Linear absorption of the CH₃NH₃PbBr₃ microstructures. (b) The transmission of an ultrashort pulse at 1240 nm as a function of incident power. The dashed line represent the fitted curve following equation (2). (c) The schematic pictures of the three-photon absorption. (d) The PL spectra under one-photon and three-photon excitations.