Low-threshold amplified spontaneous emission and lasing from colloidal nanocrystals of caesium lead halide perovskites

Sergii Yakunin, Loredana Protesescu, Franziska Krieg, Maryna I. Bodnarchuk, Georgian Nedelcu, Markus Humer, Gabriele De Luca, Manfred Fiebig, Wolfgang Heiss and Maksym V. Kovalenko ()
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Sergii Yakunin: Laboratory of Inorganic Chemistry, ETH Zürich
Loredana Protesescu: Laboratory of Inorganic Chemistry, ETH Zürich
Franziska Krieg: Laboratory of Inorganic Chemistry, ETH Zürich
Maryna I. Bodnarchuk: Laboratory of Inorganic Chemistry, ETH Zürich
Georgian Nedelcu: Laboratory of Inorganic Chemistry, ETH Zürich
Markus Humer: Institute of Semiconductor and Solid State Physics, University Linz
Gabriele De Luca: Laboratory for Multifunctional Ferroic Materials, ETH Zürich
Manfred Fiebig: Laboratory for Multifunctional Ferroic Materials, ETH Zürich
Wolfgang Heiss: Institute of Semiconductor and Solid State Physics, University Linz
Maksym V. Kovalenko: Laboratory of Inorganic Chemistry, ETH Zürich

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract 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.

Date: 2015
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DOI: 10.1038/ncomms9056

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