Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.062
Publication date: 6th July 2018
Fully inorganic cesium lead halide (CsPbX3, where X = Cl, Br, I) perovskite-type nanocrystals are colloidal quantum dots with bright, narrowband emission that is tunable by composition and size over a wide spectral range with room-temperature photoluminescence quantum yield of up to 90%[1]. A pecularity of this material is the almost blinking-free emission at low temperature[2] that originates from a triplet state with exceptionally high oscillator strength[3].
We use densely packed arrays of up to several millions of these nanocrystals, known as superlattices, produced by means of solvent-drying-induced spontaneous assembly[4]. Such ensemble of emitters behaves dramatically different from its individual constituents due to coherent interaction enabled by the strong light-matter interaction and the excellent monodispersity of the quantum dots. The collective coupling gives rise to an intriguing many-body quantum phenomenon, resulting in short, intense bursts of light: so-called superfluorescence. We observe a comprehensive set of key signatures like dynamically red-shifted emission with more than twenty-fold accelerated radiative decay, extension of the first-order coherence time by more than a factor of four, photon bunching, and delayed emission pulses with Burnham–Chiao ringing behaviour at high excitation density.
This is the first demonstration of optical collective behaviour and extended coherent states with nanocrystals, opening up new opportunities for high-brightness and multi-photon quantum light sources.
References:
[1] Protesescu et al., Nano Lett. 15, 3692–3696 (2015)
[2] Rainò et al., ACS Nano 10, 2485–2490 (2016)
[3] Becker et al., Nature, 553, 187-193 (2018)
[4] Rainò et al., arXiv 1804.01873 (2018)
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