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. 2019 Jan 24;9:521. doi: 10.1038/s41598-018-36741-1

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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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Overview of chemical structures and optical properties of MHI148-PEI. (a) Synthetic route of MHI148-PEI and MHI148-PEI-S. (b) The absorption and fluorescent emission spectra of MHI148-PEI in phosphate buffered saline (PBS) solution, Ab_max: 654 nm, Em_max: 762 nm. (c) and (d) The size distribution of MHI148-PEI-S and MHI148-PEI.