Efficient Red/Near‐Infrared‐Emissive Carbon Nanodots with Multiphoton Excited Upconversion Fluorescence by Kai‐Kai Liu, Shi‐Yu Song, Lai‐Zhi Sui, Si‐Xuan Wu, Peng‐Tao Jing, Ruo‐Qiu Wang, Qing‐Yi Li, Guo‐Rong Wu, Zhen‐Zhong Zhang, Kai‐Jun Yuan, Chong‐Xin Shan

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