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Halide perovskites have indisputably exceptional optical and electronicproperties, which are attractive for next-generation optoelectronic devicetechnologies. We report on a reversible photoluminescence (PL) peak iniodide-based organic-inorganic lead halide perovskite materials under atwo-photon absorption (TPA) process, while tuning the excitation wavelength.This phenomenon occurs when the incoming femtosecond (fs) laser photon energyis higher than a threshold energy. Intriguingly, this phenomenon also occurs inother kinds of iodide perovskite materials. Moreover, two more shorterwavelength peaks exhibit and become prominent when the excitation photon energyis being tuned in the high energy wavelength spectrum, while laser power isremained constant. However, the spectral PL energy window between the originalmaterial peak and the first high energy peak can vary based on theoptoelectronic properties of the prepared films. The same phenomenon ofreversible PL peak is also observed in various iodide based organic-inorganichalides as well as all-inorganic perovskite single crystals and polycrystals.We attribute to the reversible PL peak to the photoinduced structuraldeformation and the associated change in optical bandgap of iodide perovskitesunder the femtosecond laser excitation. Our findings will introduce a newdegree of freedom in future research as well as adding new functionalities tooptoelectronic applications in these emerging perovskite materials.

Excitation Wavelength Dependent Reversible Photoluminescence Peak in Iodide Perovskites