Highly Luminescent Cesium Lead Halide Perovskite Nanocrystals with Tunable Composition and Thickness by Ultrasonication.
We 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 CsPbBr3and CsPbI3nanoplatelets 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.
Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität, Amalienstrasse 54, 80799, Munich, Germany.|Nanosystems Initiative Munich (NIM), Schellingstrasse 4, 80799, Munich, Germany.
Yu
Y
Tong
EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium.
Eva
E
Bladt
Department of Chemistry and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität (LMU), Butenandtstrasse 5-13, 81377, Munich, Germany.
Meltem F
MF
Aygüler
Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität, Amalienstrasse 54, 80799, Munich, Germany.|Nanosystems Initiative Munich (NIM), Schellingstrasse 4, 80799, Munich, Germany.
Aurora
A
Manzi
Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Rd, Cambridge, CB3 0FS, UK.
Karolina Z
KZ
Milowska
Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität, Amalienstrasse 54, 80799, Munich, Germany.
Verena A
VA
Hintermayr
Department of Chemistry and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität (LMU), Butenandtstrasse 5-13, 81377, Munich, Germany.
Pablo
P
Docampo
EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium. sara.bals@uantwerpen.be.
Sara
S
Bals
Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität, Amalienstrasse 54, 80799, Munich, Germany. urban@lmu.de.|Nanosystems Initiative Munich (NIM), Schellingstrasse 4, 80799, Munich, Germany. urban@lmu.de.
Alexander S
AS
Urban
Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität, Amalienstrasse 54, 80799, Munich, Germany. l.polavarapu@lmu.de.|Nanosystems Initiative Munich (NIM), Schellingstrasse 4, 80799, Munich, Germany. l.polavarapu@lmu.de.
Lakshminarayana
0000-0002-9040-5719
L
Polavarapu
Chair for Photonics and Optoelectronics, Department of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität, Amalienstrasse 54, 80799, Munich, Germany.|Nanosystems Initiative Munich (NIM), Schellingstrasse 4, 80799, Munich, Germany.
Jochen
J
Feldmann
HAADF-STEM; nanocrystals; perovskites; quantum confinement; ultrasonication