关于举行苏黎世联邦理工学院 Maksym V. Kovalenko教授学术报告会的通知

2021-06-15 10

关于举行苏黎世联邦理工学院

Maksym V. Kovalenko教授学术报告会的通知

 

报告题目:Lead Halide Perovskite Nanocrystals: From Discovery to Superfluorescent Superlattices

   人:Maksym V. Kovalenko 教授(苏黎世联邦理工学院

   人:夏志国 教授

报告时间:202161616:00-17:30

报告地点: 腾讯会议 933 068 083

会议直播:https://voovmeeting.com/s/kyyEXzQhUYn8

 

报告摘要:We will discuss the discovery and recent developments of colloidal lead halide perovskite nanocrystals (LHP NCsNCs, A=Cs+, FA+, FA=formamidinium; X=Cl, Br, I).  LHP NCs exhibit spectrally narrow (<100 meV) fluorescence, tunable over the entire visible spectral region of 400-800 nm. Owing to their high oscillator strength, slow dephasing (long coherence times of up to 80 ps), minimal inhomogeneous broadening of emission lines, and a bright triplet exciton character with orthogonal dipole orientation, these NCs make for a highly versatile platform for creating controlled, aggregated states exhibiting collective phenomena. Long-range ordered superlattices (SLs) with the simple cubic packing of cubic perovskite NCs exhibit sharp red-shifted lines in their emission spectra and superfluorescence (a fast collective emission resulting from coherent multi-NCs excited states). We now present perovskite-type ABO3 binary and ternary NC SLs by a shape-directed co-assembly of CsPbBr3 nanocubes (occupying B- and/or O-sites) with spherical dielectric Fe3O4 or NaGdF4 NCs (A-sites) and truncated-cuboid PbS NCs (B-site). Such ABO3 SLs, as well as other newly obtained SL structures (binary NaCl- and AlB2-types, columnar assemblies with disks etc.), exhibit a high degree of orientational ordering of CsPbBrnanocubes. These mesostructures exhibit superfluorescence as well, characterized, at high excitation density, by emission pulses with ultrafast (22 ps) radiative decay and Burnham-Chiao ringing behaviour with a strongly accelerated build-up time.

 

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报告人简介:Maksym V. Kovalenko为瑞士苏黎世联邦理工学院(Swiss Federal Institute of Technilogy in Zürich))教授。他于 2007 年在奥地利林茨约翰内斯开普勒大学获得博士学位。随后在美国芝加哥大学从事博士后研究。2011年,加入苏黎世联邦理工学院和瑞士联邦材料科学与技术实验室任职至今。研究方向包括化学、物理和功能无机材料的应用,包括胶体量子点、新型固态化合物和电化学储能材料。目前的研究集中于功能无机材料:(i) 高效发光的半导体纳米晶的合成; (ii) 纳米晶表面化学; (iii) 通过溶液和固态合成方法探索新型半导体材料; (iv) 用于超短波辐射探测的新型半导体;(iv) 锂离子和后锂离子电池的新材料。迄今为止,先后在包括Nature ScienceNature MaterialsNature PhotonicsJournal of the American Chemical SocietyAdvanced Materials等国际重要学术刊物上发表相关研究论文290 篇,被引次数33000余次,H-index75。他曾获得多项享有盛誉的奖项,包括Rössler Prize2019年)ERC Consolidator Grant2018 年)、ERC Starting Grant2012 年)、Ruzicka Preis2013 年)、Werner Prize2016 年)和 Dan Maydan Prize2021 年)。此外 他目前担任 Chemistry of Materials杂志的副主编。


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