Chiral-Guest Induced Multicolor-Tunable Circularly Polarized Room Temperature Phosphorescence

The development of organic circularly polarized room temperature phosphorescence (CP-RTP) materials with tunable emission colors has important value in the field of optoelectronic applications but remains a challenging issue. Herein, a CP-RTP doped system with green, yellow, and red afterglow is constructed by introducing chiral groups into three phosphors naphthalene, phenanthrene, and pyrene as guests respectively, using polyvinyl pyrrolidone (PVP) as the host. The phosphorescence quantum yield of the doped system is 7.3%-13.6%, the phosphorescence lifetime is 341 ms-1017 ms, and the asymmetry factor is 0.001-0.0021. Further doping three guests simultaneously into the PVP resulted in the four-component doped materials. Benefiting from the different excitation wavelengths of three guests, when the excitation wavelength changes from 300 to 365 nm, the afterglow of the four-component doped materials changes from green to yellow and finally to red. Moreover, due to the different phosphorescence lifetimes of different guests, the afterglow can in turn change from red to green after excitation at 365 nm, demonstrating a time-dependence phosphorescence emission property. This doped strategy provides an effective platform for constructing organic multicolor CP-RTP materials. A series of circularly polarized phosphorescence doped materials with green, yellow, and red afterglow is constructed, the doped materials exhibit excitation-dependent and time-dependent RTP properties.image