讲座预告 | 西班牙维戈大学Lakshminarayana Polavarapu教授： Halide Perovskite Nanocrystals: Tailoring Light Emission through Nanoscale Chemistry
报告题目：Halide Perovskite Nanocrystals: Tailoring Light Emission through Nanoscale Chemistry
报 告 人：Lakshminarayana Polavarapu 教授（西班牙维戈大学）
邀 请 人：叶俊志 教授
报告时间：2026年5月28日（周四）下午3:00-4:00
报告地点：科技园1号楼501学术报告厅
报告摘要：
Over the last decade, metal halide perovskite nanocrystals (PeNCs) have emerged as a promising class of colloidal semiconductor materials with many desirable properties for optoelectronics.1 In particular, their high defect tolerance leads to near-unity photoluminescence quantum yield (PLQY), making them highly promising for light-emitting applications such as LEDs, lasers, and quantum light sources.2 The light emission of lead halide perovskite nanocrystals (LHP NCs) is tunable not only by their dimensions and composition but also by their self-assembly into ordered architectures and doping with various metal ions.1-3 Over the years, we demonstrated the control of light emission in nanoscale perovskites through shape control, from nanocubes and nanowires to nanorods and quantum-confined nanoplatelets, and their self-assembly into supercrystals to metal surfaces.1-5 Moreover, the emission of halide perovskites can be tuned from unpolarized to polarized (linear or circular) by self-assembly processes or through surface functionalization with chiral molecules.1 Despite their defect tolerance, the optical properties of PeNCs are highly sensitive to surface traps, which are controllable by proper ligand engineering or halide passivation. The first part of my talk will be focused on our contribution to the shape control, self-assembly, and surface engineering of PeNCs over the last decade.2-5 In the second part, different strategies for achieving polarized emission, either by self-assembly of NCs or helical structural engineering, will be discussed.
过去十年中，金属卤化物钙钛矿纳米晶（PeNCs）已成为一类极具前景的胶体半导体材料，具备许多适用于光电子学的优异性能。尤其是，其高缺陷容忍度可带来接近 100% 的光致发光量子产率（PLQY），使其在 LED、激光器和量子光源等发光应用中极具潜力。铅卤化物钙钛矿纳米晶（LHP NCs）的发光不仅可以通过其尺寸和组成进行调控，还可以通过自组装形成有序结构以及掺杂多种金属离子来调节。多年来，我们展示了通过形貌控制来调控纳米尺度钙钛矿的发光性能，形貌范围涵盖纳米立方体、纳米线、纳米棒以及具有量子限域效应的纳米片；同时，我们也研究了它们从自组装成超晶体到与金属表面结合的过程。此外，卤化物钙钛矿的发光可通过自组装过程，或通过手性分子的表面功能化，从非偏振发光调控为偏振发光（线偏振或圆偏振）。尽管 PeNCs 具有缺陷容忍性，其光学性质仍对表面陷阱高度敏感，而这些表面陷阱可以通过适当的配体工程或卤化物钝化加以控制。本报告的第一部分将重点介绍我们在过去十年中对 PeNCs 形貌控制、自组装和表面工程方面的贡献。第二部分将讨论实现偏振发光的不同策略，包括通过纳米晶自组装或螺旋结构工程来实现偏振发光。
References:
1.A. Dey, et al. State of the art and prospects for halide perovskite nanocrystals, ACS Nano, 2021, 15, 10775
2.Y. Tong et al. Highly luminescent cesium lead halide perovskite nanocrystals with tunable composition and thickness by ultrasonication, Angew. Chem. Int. Ed., 2016, 55, 13887
3.B. Bohn et al. Boosting tunable blue luminescence of halide perovskite nanoplatelets through postsynthetic surface trap repair, Nano Lett., 2018, 18, 5231
4.S. Singh, et al. Defect Passivation Strategies in Halide Perovskite Solar Cells and LEDs. ACS Energy Lett., 2026, 11, 3060.
5.N. Fiuza-Maneiro, et al. Delayed Halide‐Rich Molecular Passivation of CsPbCl3 Perovskite Nanocrystals Enables Bright Violet Light‐Emitting Diodes, Angew. Chem. Int. Ed., 2026, e26012.
报告人简介：
Lakshminarayana Polavarapu is the principal investigator of the Materials Chemistry and Physics research group at the Centro De Investigaciones Biomédicas (CINBIO), and associate professor in the department of physical chemistry at the University of Vigo. He serves as a Topic Editor for ACS Energy Letters and on the Editorial Advisory boards of Nanoscale, Advanced Optical Materials, and Advanced Physics Research. He obtained a Ph.D. in Chemistry from the National University of Singapore. After being a postdoctoral fellow at CIC biomaGUNE and the University of Vigo in Spain, he joined the Chair for Photonics and Optoelectronics at the Ludwig-Maximillian-University of Munich (Germany) as an Alexander von Humboldt postdoctoral fellow and later continued as a group leader until May 2020. He obtained the Ramon y Cajal fellowship, the highest fellowship in Spain, and established an independent research group at the University of Vigo in 2020. Prof. Polavrarapu’s research focuses on shape-controlled synthesis and self-assembly of semiconductor nanocrystals for exploring their optical properties and optoelectronic applications. Over the last decade, he has contributed immensely to the field of halide perovskite nanocrystals (NCs) research regarding their colloidal chemistry, shape control, surface chemistry and achieving polarized emission, which has laid foundation for the broad range of optoelectronic applications.
Lakshminarayana Polavarapu (H-index 71)是西班牙维戈大学生物医学研究中心（Centro De Investigaciones Biomédicas，CINBIO）材料化学与物理研究组的首席研究员，也是维戈大学物理化学系教授。他担任《ACS Energy Letters》的专题编辑，并任《Nanoscale》《Advanced Optical Materials》和《Advanced Physics Research》期刊的编辑顾问委员会成员。他在新加坡国立大学获得化学博士学位。之后，他曾在西班牙CIC biomaGUNE和维戈大学从事博士后研究；随后，他以洪堡博士后研究员身份加入德国慕尼黑路德维希-马克西米利安大学(LMU)光子学与光电子学讲席教授Jochen Feldmann课题组，并继续担任课题组组长直至2020年5月。他获得了西班牙最高级别的 Ramón y Cajal 研究员资助，并于2020年在维戈大学建立了独立研究团队。Polavarapu 教授的研究聚焦于半导体纳米晶的形貌可控合成与自组装，以探索其光学性质和光电子应用。在过去十年中，他在卤化物钙钛矿纳米晶（NCs）研究领域作出了重要贡献，尤其是在胶体化学、形貌控制、表面化学以及实现偏振发射等方面。这些工作为其在广泛光电子应用中的发展奠定了基础。
