Chen, Xu-Lin; Tao, Xiao-Dong; Wei, Zhuangzhuang; Meng, Lingyi; Lin, Fu-Lin; Zhang, Dong-Hai; Jing, Yan-Yun; Lu, Can-Zhong published the artcile< Thermally Activated Delayed Fluorescence Amorphous Molecular Materials for High-Performance Organic Light-Emitting Diodes>, HPLC of Formula: 576-83-0, the main research area is thermally activated delayed fluorescence amorphous mol material high performance; OLEDs; amorphous molecular materials; bimesitylene; film quality; stability; thermally activated delayed fluorescence.
Small-mol. thermally activated delayed fluorescence (TADF) materials have been extensively developed to actualize efficient organic LEDs (OLEDs). However, organic small mols. generally compromise thin film quality and stability due to the tendency of crystallization, aggregation, and phase separation, which hence degrade the efficiency and long-term stability of the OLEDs. Here, for the first time, we exploit the unique mol. configuration of the bimesitylene scaffold to design two highly efficient TADF amorphous mol. materials with excellent thermal and morphol. stabilities. The twisted and rigid bimesitylene scaffold thwarts regular mol. packing and crystallization, thereby guaranteeing homogeneous and stable amorphous thin films. Meanwhile, the highly twisted geometry of the bimesitylene scaffold efficiently breaks the mol. conjugation and thus conserves the high energies of the lowest locally excited triplet states (3LE) above the lowest charge transfer states (1CT and 3CT), leading to small singlet-triplet energy splitting and fast reverse intersystem crossing. These TADF emitters exhibit high photoluminescence quantum yields of 0.90 and 0.69 and short TADF lifetimes of 4.94 and 1.44μs in doped films, based on which the greenish-blue and greenish-yellow OLEDs achieve external quantum efficiencies of 23.2 and 16.2%, resp., with small efficiency roll-off rates and perfect color stability.
ACS Applied Materials & Interfaces published new progress about Crystallinity. 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, HPLC of Formula: 576-83-0.
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary