The author of 《Efficient Deep-Blue Fluorescent OLEDs with a High Exciton Utilization Efficiency from a Fully Twisted Phenanthroimidazole-Anthracene Emitter》 were Xu, Yuwei; Liang, Xiaoming; Liang, Yiqian; Guo, Xiaomin; Hanif, Muddasir; Zhou, Jiadong; Zhou, Xuehong; Wang, Cong; Yao, Jingwen; Zhao, Ruiyang; Hu, Dehua; Qiao, Xianfeng; Ma, Dongge; Ma, Yuguang. And the article was published in ACS Applied Materials & Interfaces in 2019. Formula: C6H4BrI The author mentioned the following in the article:
A novel, efficient, deep-blue fluorescent emitter mPAC, with a meta-connected donor-acceptor structure containing phenanthroimidazole (PPI) as the donor and phenylcarbazole-substituted anthracene (An-CzP) as the acceptor, was designed and synthesized. The meta-linkage provided a highly twisted mol. conformation, which efficiently interrupts the intramol. π-conjugation, resulting in a deep-blue emission. The optimized nondoped device based on mPAC displayed a deep-blue emission with a narrow full width at half-maximum of 56 nm and Commission Internationale de L’Eclairage coordinates of (0.16, 0.09). The maximum external quantum efficiency (EQEmax) is 6.76%, corresponding to a high exciton utilization efficiency (EUE) of 59.3-88.9%. Exptl. results and theor. anal. indicated that the high EUE is mainly ascribed to the reverse intersystem crossing (RISC) from T2 to S1, a “”hot exciton”” path in which the large T2-T1 energy gap (1.45 eV) and small T2-S1 energy difference (0.18 eV, T2 > S1) hamper the internal crossing from T2 to T1 and facilitate the RISC process. For the hot exciton path, the T2 state can be feasibly arranged to a high energy level, forming a thermal equilibrium with S1, even slightly higher than the deep-blue S1 to realize an exergonic RISC process, which is usually difficult for the thermally activated delayed fluorescence emitters. After reading the article, we found that the author used 1-Bromo-3-iodobenzene(cas: 591-18-4Formula: C6H4BrI)
1-Bromo-3-iodobenzene(cas: 591-18-4) has been used in the preparation of 1-(3′-bromophenyl)-3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodec-1-ene and 1-(3′-bromophenyl)-3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooct-1-ene.Formula: C6H4BrI
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com