Gets, D. S.Tiguntseva, E. Y.Berestennikov, A. S.Lyashenko, T. G.Pushkarev, A. P.Makarov, S. V.Zakhidov, Anvar A.2019-08-302019-08-302018-08-280021-3640https://hdl.handle.net/10735.1/6817Full text access from Treasures at UT Dallas is restricted to current UTD affiliates (use the provided Link to Article).Organic–inorganic perovskites with a mixed anion composition are widely used in solar cells, light-emitting diodes, and nanophotonic structures. Light nanosources based on resonant perovskite nanoparticles are of particular interest. However, perovskites with such a composition demonstrate the light-induced segregation of anions, which leads to a reversible dynamic rearrangement of the optical properties of a material and photoluminescence spectra. In this work, the photoinduced process of change in optical properties in resonant hybrid perovskite nanoparticles with a mixed anion composition (MAPbBr₁.₅I₁.₅, where MA = NH₃CH₃⁺) has been studied. Comparison with a similar process in a perovskite thin film with a similar composition has shown that the photoinduced migration of halogen ions in a nanoparticle occurs cyclically. This is due to the competition of two processes: the concentration of ions near the boundaries of the particle and migration caused by the gradient of the density of light-generated electron–hole pairs. This effect in resonant nanoparticles makes it possible to obtain optically tunable nanoantennas.en©2018, Pleiades Publishing, Inc.PerovskiteAnionsHalogensPhotoluminescenceNanoparticlesarticleGets, D. S., E. Y. Tiguntseva, A. S. Berestennikov, T. G. Lyashenko, et al. 2018. "Photoinduced Migration of Ions in Optically Resonant Perovskite Nanoparticles." JETP Letters 107(12): 742-748, doi:10.1134/S002136401812007X10712