Carbon‐Based Dots Co‐doped with Nitrogen and Sulfur for High Quantum Yield and Excitation‐Independent Emission1. (11th June 2013) - Dong, Yongqiang; Pang, Hongchang; Yang, Hong Bin; Guo, Chunxian; Shao, Jingwei; Chi, Yuwu; Li, Chang Ming; Yu, Ting