An ambipolar 3,3′-dimethyl-9,9′-bianthracene derivative as a blue host material for highperformance OLEDs

作者：Li, Zhanfeng^*; Wang, Xiangkun; Lv, Xiang; Si, Changfeng; Wei, Bin^*; Wang, Hua; Hao, Yuying^*

来源：RSC Advances, 2017, 7(77): 49125-49132.

DOI：10.1039/c7ra09179f

• LIGHT-EMITTING-DIODES
• INTRAMOLECULAR CHARGE-TRANSFER
• FLUORINATED 9,9'-BIANTHRACENE DERIVATIVES
• TRANSFER EXCITED-STATES
• DEEP-BLUE
• FLUORESCENT ELECTROLUMINESCENCE
• RADIATIVE-EXCITONS
• ELECTRON-TRANSFER
• HIGH-EFFICIENCY
• DEVICES

A new ambipolar deep blue fluorophore with a non-donor-acceptor structure, MBAn-(4)-tBu (10,10'-bis( 4-tert-butyl-phenyl)-3,30-dimethyl-9,90-bianthracene), was designed and synthesized based on 3,3'-dimethyl- 9,90-bianthracene. The twisted conformation of the two anthracene units and the bulky end group substituted with a tert-butyl group in MBAn-(4)-tBu prevented pi-conjugation effectively. In particular, MBAn-(4)-tBu in a non-doped device exhibited a maximum external quantum efficiency (EQE) of 3.94% with Commission Internationale de I'Eclairage (CIE) coordinates of (0.16, 0.07) and a narrow full width at half maximum of 49 nm, which was close to the CIE of high definition television standard blue. Furthermore, MBAn-(4)-tBu worked as an excellent fluorescent host for BD1 and DSA-ph dopants to obtain high performance OLEDs with excellent EQEs of 5.26% and 6.96%, respectively. These results demonstrate that the ambipolar 3,30-dimethyl-9,90-bianthracene molecule with a non-donor-acceptor structure is advantageous for the fabrication of highly efficient blue fluorescent OLEDs.

• 出版日期2017
• 单位上海大学; 太原理工大学