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

Abstract

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 ℃, 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.

Design and Development of Highly Efficient Light‐Emitting Layers in OLEDs with Dimesitylboranes: An Updated Review

“…OLEDs made with the compounds as light emitters and electron transporters have excellent performance with high EL efficiency of 13.9 cd/A, 4.35 % and 11.6 lm/W. Another yellow luminescent molecule that including silole and BMes 2 was reported in 2015 . The use of (MesBF) 2 MTPS as an emitter showed high maximum brightness of 48348 cd/m 2 , good current efficiency of 12.3 cd/A, and external quantum efficiency of 4.1 %.…”

Aggregation-induced emission of siloles

“…A similar silole derivative, (MesBF) 2 MPPS, created by integrating dimesitylboryl substituents into MFMPS, also shows excellent solid-state emission and great potential as an electron transporter. 55 The incorporation of other electron deficient substituents, such as diphenylphosphine oxide, can also improve the electron-transporting ability without undermining the solid-state fluorescence efficiency ( Scheme 12 ).…”

Multifunctional aggregation-induced emission materials for nondoped OLEDs

“…器件I的开启电压 (V on )为3.1 V, 最大亮度(L max )为13405 cd m 2 , 最大电流 图 1 (网络版彩色)六苯基噻咯的分子结构及聚集诱导发光现象 [30] Figure 1 (Color online) Molecular structure of hexaphenylsilole (HPS) and AIE active [30] 效率( C,max )、最大功率效率( P,max )和最大外量子效率 ( ext,max )分别为8. 28 Quan等人 [28,29]…”