Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 47: Quantum dots and wires: Optical properties II
HL 47.10: Vortrag
Freitag, 5. April 2019, 12:00–12:15, H34
Highly luminescent halide perovskite Supercrystals: Toward Filling the Green Gap — •Maximilian Feil, Aurora Manzi, Yu Tong, Julius Feucht, En-Ping Yao, Markus Döblinger, Lakshminarayana Polavarapu, Alexander Urban, and Jochen Feldmann — Ludwig-Maximilians-Universität München, Munich, Germany
Self-assembly of nanoscale building blocks into ordered nanoarchitectures has emerged as a powerful approach for tailoring the nanoscale optical properties and using them for the development of novel optical devices [1, 2]. In our studies, we aim to uncover the optical properties of CsPbX3 (X= Cl, Br, I) perovskite nanocubes (NCs) assembling into 3D superlattices commonly referred to as supercrystals (SCs). In this presentation, we will show a new one-pot synthesis method to obtain colloidal CsPbX3 perovskite SCs by spontaneous self-assembly of individual NCs. The SCs retain the high photoluminescence efficiency of their NC subunits, however also exhibit a redshifted emission compared to that of the individual NCs due to miniband formation via electronic coupling between the NC subunits [1]. This redshift makes the SCs pure green emitters filling the so-called Green Gap, while the individual NCs emit a cyan-green color.
[1] Y. Tong, E.-P. Yao, A. Manzi, E. Bladt, K. Wang, M. Doblinger, S. Bals, P. M. Buschbaum, A. S. Urban, L. Polavarapu, J. Feldmann, Adv. Mater. 30, 1801117 (2018) [2] A. Manzi, Y. Tong, J. Feucht, E.-P. Yao, L. Polavarapu, A. S. Urban, J. Feldmann, Nat. Commun. 9 (1), 1518 (2018)