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. 2021 Sep 23;16(11):1237–1243. doi: 10.1038/s41565-021-00970-9

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© The Author(s) 2021

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, PL spectrum map as a function of V_g. The prominent IX emission peaks are labelled as A–G in each doping region. The dashed lines identify the V_g of the linecuts for the spectra shown in b. n_e, electron density; n_h, hole density. b, Representative PL spectra for trapped IX⁰, IX^– and IX⁺. For direct comparison with the IX⁰ PL spectrum, the IX^– (IX⁺) PL spectra are shifted by 6.5 (6.0) meV in relative photon energy. c, A high-resolution spatial map of the integrated PL intensity of emitter D. From the Gaussian fits, the spatial position can be determined with ~25 nm precision. d, Spatial positions of the trapped IX⁰ and IX^– for various emitters. Error bars represent the standard deviation of repetitive measurements.