A Silole-Based Efficient Electroluminescent Material with Good Electron-Transporting Potential

A new silole derivative, 2,5-bis(7-(dimesitylboranyl)-9,9-dimethylfluoren-2-yl)-1-methyl-1,3,4-triphenylsilole((MesBF)(2)MTPS), is synthesized and characterized. (MesBF)(2)MTPS shows a good fluorescence efficiency of 15% in THF solution and a higher efficiency of 86% in solid film, presenting an aggregation-enhanced emission characteristic. It is thermally and morphologically stable, with high decomposition and glass-transition temperatures of 257 and 171 degrees C , respectively. The LUMO energy level (-2.96 eV) of (MesBF)(2)MTPS is lower than that of TPBi, revealing its electron-transporting potential. Efficient organic light-emitting diodes (OLEDs) are fabricated using (MesBF)(2)MTPS as emitter, which radiates yellow light at 554 nm, and affords high maximum luminance, current efficiency, and external quantum efficiency of 48348 cd.m(-2), 12.3 cd.A(-1), and 4.1%, respectively.