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https://pubs.rsc.org/en/content/articlelanding/2018/nr/c8nr00204e#!divAbstract

ÒýÓ㺣º[1] Yeqing Chen, Hongzhou Lian, Yi Wei, Xin He, Yan Chen, Bo Wang, Qingguang Zeng,* and   Jun Lin*, Concentration induced multi-color emission in carbon dots: origination from triple fluorescent centers, Nanoscale, 2018, 10, 6734-6743.