Controlling the Light Emission from Lead Halide Perovskite Nanocrystals by Composition and Self-assembly
Lakshminarayana Polavarapu a
a CINBIO, Universidade de Vigo, Materials Chemistry and Physics Group, Department of Physical Chemistry, Campus Universitario Lagoas, Marcosende, 36310 Vigo, Spain
Proceedings of International Conference on Emerging Light Emitting Materials (EMLEM22)
Materials for next generation LEDs and lasers:
Limasol, Cyprus, 2022 October 3rd - 5th
Organizers: Maksym Kovalenko, Maryna Bodnarchuk and Grigorios Itskos
Invited Speaker, Lakshminarayana Polavarapu, presentation 082
Publication date: 15th July 2022

Over the last 7-8 years, lead halide perovskite nanocrystals (LHP NCs) have emerged as extremely efficient light sources with color-tunable capability by simple chemistry.1 LHP NCs exhibit very high photoluminescence quantum yields regardless of the synthesis conditions and the quality of the precursors owing to their defect tolerance nature (especially the Br and I-based). The light emission of LHP NCs is not only tunable by their dimensions and composition2 but also through self-assembly into ordered architectures.3 The tunability of halide composition has been greatly exploited to tune the optical properties of LHP NCs, while the A-site and B-site cation tunability has been relatively less explored. Recently, our group showed that the A-site cation exchange in LHP NCs is as fast as halide exchange in the presence of excess ligands.4 The ligands act as transporters of cations from one NC to the other.  This talk will be focused on the latest results of our group regarding the A-cation tuning and the interesting properties that are observed from the mixed A-cation perovskites in comparison with single A-cation LHP NCs. In addition, some of the latest results on confined self-assembly into chiral architectures emitting chiral light.



1.         (a) Dey et al., State of the Art and Prospects for Halide Perovskite Nanocrystals. ACS Nano 2021, 15 (7), 10775-10981; (b) Akkerman et al., Genesis, challenges and opportunities for colloidal lead halide perovskite nanocrystals. Nat. Mater. 2018, 17 (5), 394-405; (c) Shamsi  et al., Post-Synthesis Modifications, and Their Optical Properties. Chem. Rev. 2019, 119 (5), 3296-3348; (d) Protesescu et al., Nanocrystals of Cesium Lead Halide Perovskites (CsPbX3, X = Cl, Br, and I): Novel Optoelectronic Materials Showing Bright Emission with Wide Color Gamut. Nano Lett. 2015, 15 (6), 3692-3696.

2.         Otero-Martínez et al., Dimensionality Control of Inorganic and Hybrid Perovskite Nanocrystals by Reaction Temperature: From No-Confinement to 3D and 1D Quantum Confinement. Angew. Chem. Int. Ed. 2021, 60 (51), 26677-26684.

3.         (a) Rainò et al., Superfluorescence From Lead Halide Perovskite Quantum Dot Superlattices. Nature 2018, 563 (7733), 671-675; (b) Vila-Liarte et al., Templated-Assembly of CsPbBr3 Perovskite Nanocrystals into 2D Photonic Supercrystals with Amplified Spontaneous Emission. Angew. Chem. Int. Ed. 2020, 59 (40), 17750-17756.

4.           Otero-Martínez et al. Fast A-Site Cation Cross-Exchange at Room Temperature: Single-to Double- and Triple-Cation Halide Perovskite Nanocrystals. Angew. Chem. Int. Ed. 2022, 61 (34), e202205617.

L.P. acknowledges the support from the Spanish Ministerio de Ciencia e Innovación through Ramón y Cajal grant (RYC2018-026103-I) and the Spanish State Research Agency (Grant No. PID2020-117371RA-I00), the grant from the Xunta de Galicia (ED431F2021/05).

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