caa a22 4500 528786415 20190713030957.0 cr unu---uuuuu 180924s2015 xx s 000 0 eng 10.3929/ethz-b-000103944 doi 10.1038/ncomms9056 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/103944 Low-threshold amplified spontaneous emission and lasing from colloidal nanocrystals of caesium lead halide perovskites [Elektronische Daten] [Sergii Yakunin, Loredana Protesescu, Franziska Krieg, Maryna I. Bodnarchuk, Georgian Nedelcu, Markus Humer, Gabriele De Luca, Manfred Fiebig, Wolfgang Heiss, Maksym V. Kovalenko] Nat Commun Open access ethresearch Metal halide semiconductors with perovskite crystal structures have recently emerged as highly promising optoelectronic materials. Despite the recent surge of reports on microcrystalline, thin-film and bulk single-crystalline metal halides, very little is known about the photophysics of metal halides in the form of uniform, size-tunable nanocrystals. Here we report low-threshold amplified spontaneous emission and lasing from ∼10 nm monodisperse colloidal nanocrystals of caesium lead halide perovskites CsPbX3 (X=Cl, Br or I, or mixed Cl/Br and Br/I systems). We find that room-temperature optical amplification can be obtained in the entire visible spectral range (440-700 nm) with low pump thresholds down to 5±1 μJ cm−2 and high values of modal net gain of at least 450±30 cm−1. Two kinds of lasing modes are successfully observed: whispering-gallery-mode lasing using silica microspheres as high-finesse resonators, conformally coated with CsPbX3 nanocrystals and random lasing in films of CsPbX3 nanocrystals. Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0 ethresearch Yakunin Sergii joint author Protesescu Loredana joint author Krieg Franziska joint author Bodnarchuk Maryna I. joint author Nedelcu Georgian joint author Humer Markus joint author De Luca Gabriele joint author Fiebig Manfred joint author Heiss Wolfgang joint author Kovalenko Maksym V. joint author Nature Communications London : Nature Publishing Group 6, p. 8056 2041-1723 http://hdl.handle.net/20.500.11850/103944 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/103944 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 700 1- Yakunin Sergii joint author ETHRESEARCH 700 1- Protesescu Loredana joint author ETHRESEARCH 700 1- Krieg Franziska joint author ETHRESEARCH 700 1- Bodnarchuk Maryna I. joint author ETHRESEARCH 700 1- Nedelcu Georgian joint author ETHRESEARCH 700 1- Humer Markus joint author ETHRESEARCH 700 1- De Luca Gabriele joint author ETHRESEARCH 700 1- Fiebig Manfred joint author ETHRESEARCH 700 1- Heiss Wolfgang joint author ETHRESEARCH 700 1- Kovalenko Maksym V. joint author ETHRESEARCH 773 0- Nature Communications London : Nature Publishing Group 6, p. 8056 2041-1723 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access