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. 2020 Jan 16;11:329. doi: 10.1038/s41467-019-14078-1

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a TEM image of monodisperse CsPbBr₃ cubic QDs. b–e TEM images of the evolution of monodisperse QDs (a) self-assembling into closely packed SC (b) and finally to the rectangular QDSM (e) via low-temperature aging and drying-mediated methods. Rows of dots capped with oleylamine and oleic acid arrange themselves along the crystalline axis (b) and finally form sharp edges and regular shape (e). c is the annular TEM images of the cuboid QDSM and d is a close-up view of the red dotted box in c. f PL spectra of different structures. g PL spectra of the cavity-enhanced SF effect from a QDSM at 77 K. Inset: the simulated field distribution of the whispering gallery mode, L₁ and L₂ are long side and short side of the QDSM, respectively. h Power dependence of the PL intensity in cavity mode. Inset: Lorentz fitting of the cavity mode. i The resonant optical modes of QDSMs with different sizes. Multimode lasing can be obtained and the spacing between two adjacent modes decreases with the increasing of cavity size.