and T2). With temperature cooling to 77 K, the lifetime of the long-wavelength emission peak is increased two orders of magnitude while that of the short-wavelength emission peak is raised only eight folds (Figure S7, 6.3 ms@470 nm, 167.6 ms@535 nm). Also, with the temperature gradually decreasing from room temperature to 77 K, the long-wavelength emission peak is gradually intensified while the short-wavelength emission peak is slightly changed (Figure ).