Dresden 2017 – wissenschaftliches Programm
CPP 13.15: Poster
Montag, 20. März 2017, 18:30–21:00, P1A
Two-Photon Photoluminescence from Quantum-Dot-Like Perovskite Nanocubes — •Alexander Biewald1,2, Veit Giegold1,2, Richard Ciesielski1,2, Fatma Meltem Aygüler1,2, Nicolai Friedrich Hartmann1,2, Pablo Docampo3, and Achim Hartschuh1,2 — 1LMU Munich, Department Chemie and CeNS, 81377 Munich — 2Nanosystems Initative Munich, 80799 Munich — 3Newcastle University, Newcastle upon Tyne, UK
Perovskites are a promising material class for new solar cell and LED applications. Especially perovskite nanocubes, with sizes below 10 nm, are interesting because they exhibit quantum confinement which allows for tuning their optical transition energies similar to other inorganic semiconducting nanocrystals. We investigated the photoluminescence (PL) of individual CsPbBr3 nanocubes deposited on glass upon pulsed two-photon excitation. Our setup combines a scanning confocal microscope and a pulse shaper in 4f geometry for amplitude and phase shaping of sub-20 fs laser pulses. We found that individual nanocubes show pronounced PL blinking, which we investigated in detail with respect to the characteristic on- and off-times. We also confirmed the non-linear intensity dependence of the PL that provides the basis for the coherent control of two-photon absorption in single nanocubes.