Laser activated room-temperature excimer delayed fluorescence of difluoroboron ?-diketonate complexes in polymer matrix

Great potential has been discovered in the development of materials with a long afterglow (phosphorescence at room temperature and delayed fluorescence) for the purposes of luminescent sensing, bioimaging, information encryption and OLED. Here, we report the long-lived (lifetime up to 1.5 s) laser-induced room-temperature excimer delayed fluorescence (RTEDF) of difluoroboron beta-diketonate complexes (BF2bdks) already at concentrations of 0.05% in solution cast polymer films. The emission centers of RTEDF of BF2bdks can retain for a long time in the polycarbonate matrix (> 3 months) and can be repeatedly re-excited with a low-intensity ultraviolet light source. These results provide a foundation for the design of materials with applications in optical information storage and data encryption and decryption.

Automated summary

Materials with long afterglow have great potential in optical information storage and data encryption and decryption. The difluoroboron beta-diketonate complexes have been shown to exhibit long-lived room-temperature excimer delayed fluorescence, which can be retained in the polycarbonate matrix for a long time and re-excited repeatedly.