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. 2019 Aug 26;10:3839. doi: 10.1038/s41467-019-11731-7

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© The Author(s) 2019

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 — Structure and optical characteristics of TNWs. a The TEM image of one typical TNW, scale bar: 10 μm. The SAED patterns at the upper-left and the below-right insets correspond to the center part with red marked area and the end part green marked area in TNWs, respectively. b The magnified image of the junction in the TNW, scale bar: 500 nm. c The SEM image of one typical TNW; scale bar: 5 μm. The corresponding energy-dispersive X-ray spectroscopy (EDS) mapping for elements (d) iodine (I) and (e) bromide (Br), respectively. The FM images of one typical TNW excited with (f) the UV band and (g) the green band (500–550 nm), scale bar: 5 μm. h Spatially resolved PL spectra and i PL decay curves collected from different locations marked in (f). Inset of h: the corresponding polar image of the peak intensities