Recently, Professor Shan Chongxin and Dr. Lou Qing of School of Physics and Engineering, ZZU have prepared fluorescent carbon nano-dots with red, green and blue colors based on the band gap engineering control of carbon nano-dots. The result is currently published online in the internationally renowned journal Advanced Science. Zhengzhou University is the first completion unit. The first author is Shen Chenglong, a doctoral student of School of Physics and Engineering, and the corresponding authors are Dr. Lou Qing and Professor Shan Chongxin. The work was supported by National Natural Science Foundation of China, Natural Science Foundation of Henan Province, and the Excellent Young Teacher Development Fund of Zhengzhou University.（translator Yang Qiuqiu）