1 School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Lab of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, No. 800 Dongchuan Rd., Minhang, Shanghai 200240, China. wzhyuan@sjtu.edu.cn.
2 Institute of Advanced Materials, North China Electric Power University, Beijing 102206, China. xhchen200905@ncepu.edu.cn.
Robust and color-tunable afterglows are readily achieved from guanidine derivatives, i.e. dicyandiamide and glycocyamine, through the synergistic interplay between the clustering of electron-rich units and effective hydrogen bonding.