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  • Author(s):
    Stefano Toso, Ilia Pavlovetc, Maksym Zhukovskyi, Sergio Marras, Masaru Kuno, Liberato Mann, Dmitry Baranov
    Abstract:

    Perovskite nanocrystal superlattices (NC SLs) are the nearest real-world approximations to monodisperse NC ensembles. NC SLs thus represent ideal model systems for evaluating the optical and structural stability of CsPb(I1−xBrx)3 NCs at a macroscopic level. Here, photoinduced changes to CsPb(I1−xBrx)3 NC SLs (0 < x < 1.0) are probed via in situ photoluminescence, X-ray diffraction, and electron microscopy. We find that prolonged (∼10−20 h) ultraviolet−visible irradiation causes irrevers…

    Date Published:
    2020-11
    Record Visibility:
    Public
  • Author(s):
    Angela Meola, Nicole Hondroglannis, Pierce Brown, Maksym Zhukovskyi, Zheng Zheng, Zeev Rosenzweig, Mary Sajini Devadas
    Abstract:

    Icosahedron and [Au25(PPh)10(C6H14S)5Cl2]2+ bi-icosahedron clusters were synthesized. Ligand exchange reactions were carried out with a new coumarin-derived fluorophore (Cou-SH) to label both clusters. Labeled and unlabeled Au25 were compared and the changes in the electronic structure were determined. The labeled clusters showed marked changes in electronic states, as evidenced by the quenching in the UV region and enhancement in the near infrared. The quantum yield from Cou-SH decreased and…

    Date Published:
    2019-08
    Record Visibility:
    Public
  • Author(s):
    Shubin Zhang, Maksym Zhukovskyi, Boldizsar Janko, Masaru Kuno
    Abstract:

    Much effort has gone into realizing laser cooling with solids over the last two decades. Multiple attempts have been made with systems that include rare-earth doped glasses, GaAs heterostructures, CdS nanobelts and hybrid perovskite nanoplatelets. Here we suggest that CsPbBr3 perovskite nanocrystals may eventually lead to verifiable demonstrations of condensed phase laser cooling. The highest emission quantum yield we have realized in CsPbBr3 nanocrystal ensembles is 99.9% at room temperature…

    Record Visibility:
    Public