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Confocal laser microscopy of photoinduced diffusion of CsPbBr3 perovskite nanoplatelets and cubic-shaped nanocrystals
Russian version
Borodina L. N. 1, Tatarinov D. A. 1, Annas K. I. 1, Borisov V. N. 1, Veniaminov A. V. 1
1PhysNano department, ITMO University, St. Petersburg, Russia
Email: lnborodina@itmo.ru, avveniaminov@itmo.ru
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The hydrodynamic size of cubic nanocrystals and rectangular nanoplatelets of CsPbBr3 perovskite diffusing in a colloidal solution were determined using stripe-Fluorescence Recovery After Photobleaching (sFRAP) technique and compared with their geometric dimensions obtained by transmission electron microscopy. The edge lengths and volumes of the cubic nanocrystals and nanoplatelets differ by a factor of 1.5-2, but their measured hydrodynamic sizes are almost identical: 15±5 nm and 13±5 nm. Variations in the nanocrystal size within the ensemble manifest themselves in luminescence (sFRAP) measurements through the nonlinearity of the time dependence of the squared width of the photoinduced spatial inhomogeneity. Keywords: perovskite quantum dots, nanoplatelets, diffusion of nonspherical nanoparticles, hydrodynamic size, confocal microscopy, Fluorescence Recovery after Photobleaching (FRAP).
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