Yu Tong1,2, Eva Bladt3, Meltem F. Aygüler4, Aurora Manzi1,2, Karolina Z. Milowska5, Verena A. Hintermayr1, Pablo Docampo4, Sara Bals3, Alexander S. Urban1,2, Lakshminarayana Polavarapu1,2, Jochen Feldmann1,2
1Chair for Photonics and Optoelectronics Department of Physics and Center for NanoScience (CeNS) Ludwig-Maximilians-Universität Amalienstrasse 54 80799 Munich Germany
2Nanosystems Initiative Munich (NIM) Schellingstrasse 4 80799 Munich Germany
3EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
4Department of Chemistry and Center for NanoScience (CeNS) Ludwig-Maximilians-Universität (LMU) Butenandtstrasse 5–13 81377 Munich Germany
5Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Rd, Cambridge CB3 0FS, UK
Tóm tắt
AbstractWe describe the simple, scalable, single‐step, and polar‐solvent‐free synthesis of high‐quality colloidal CsPbX3 (X=Cl, Br, and I) perovskite nanocrystals (NCs) with tunable halide ion composition and thickness by direct ultrasonication of the corresponding precursor solutions in the presence of organic capping molecules. High angle annular dark field scanning transmission electron microscopy (HAADF‐STEM) revealed the cubic crystal structure and surface termination of the NCs with atomic resolution. The NCs exhibit high photoluminescence quantum yields, narrow emission line widths, and considerable air stability. Furthermore, we investigated the quantum size effects in CsPbBr3 and CsPbI3 nanoplatelets by tuning their thickness down to only three to six monolayers. The high quality of the prepared NCs (CsPbBr3) was confirmed by amplified spontaneous emission with low thresholds. The versatility of this synthesis approach was demonstrated by synthesizing different perovskite NCs.
