Phosphine oxide-jointed electron transporters for the reduction of interfacial quenching in highly efficient blue PHOLEDs

	Phosphine oxide-jointed electron transporters for the reduction of interfacial quenching in highly efficient blue PHOLEDs
	Kan, Wenjing 1; Zhu, Liping 2; Wei, Ying 1,3; Ma, Dongge 2; Sun, Mingzhi 1; Wu, Zhongbin 2; Huang, Wei 3; Xu, Hui 1,3
刊名	JOURNAL OF MATERIALS CHEMISTRY C
	2015
卷号	3 期号:21 页码:5430-5439
英文摘要	A series of benzimidazole-PO hybrids, PBIPO, DPBIPO and TPBIPO, with different configurations of phosphine oxide (PO)-bridged 2-phenylbenzimidazole (PBI) groups, demonstrate an effective charge-exciton separation (CES) strategy for electron-transport material (ETM) design aimed at interfacial triplet-polaron quenching (TPQ) suppression in hole-predominant phosphorescent organic light-emitting diodes (PHOLEDs). The electronic states of these materials are well-controlled by virtue of their insulating and electron-withdrawing phosphine oxide joints. Their equivalent frontier molecular orbital energy levels (-2.7 and -6.4 eV) and triplet states (3.0 eV) give them identical good electron-injecting/hole-blocking abilities and effective exciton diffusion suppression, establishing a correspondence between electron mobility and interfacial TPQ effect, and the device performance of these ETMs. Stronger interactions between TPPO groups and blue phosphor iridium(III) bis(2-(4,6-difluorophenyl)-pyridinato-N, C20) picolinate (FIrpic) give rise to the optimized orientation of unsymmetrical PBIPO on the emissive layer (EML) to separate its charged moiety from the EML interface, effectively suppressing interfacial TPQ. Consequently, PBIPO endows its conventional FIrpic-based blue device with state-of-the-art efficiencies of 47.3 cd A(-1), 36.0 lm W-1 and 22.2%, which are two-and three-fold those of the common ETM TPBI and its analogue DPBIPO, with a two orders of magnitude higher electron mobility. At 1000 cd m(-2), the efficiencies of PBIPO-based devices still remained at 43.5 cd A(-1) and 20.1%, making PBIPO among the most efficient high-energy-gap ETMs to date and manifesting the effectiveness of the molecular CES strategy for interfacial TPQ suppression.
收录类别	SCI
语种	英语
公开日期	2015-11-02
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/28078]
专题	化学研究所_高分子物理与化学实验室
作者单位	1.Heilongjiang Univ, Sch Chem & Mat, Minist Educ, Key Lab Funct Inorgan Mat Chem, Harbin 150080, Peoples R China 2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 3.Nanjing Tech Univ Nanjing Tech, Inst Adv Mat, Nanjing 211800, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Kan, Wenjing,Zhu, Liping,Wei, Ying,et al. Phosphine oxide-jointed electron transporters for the reduction of interfacial quenching in highly efficient blue PHOLEDs[J]. JOURNAL OF MATERIALS CHEMISTRY C,2015,3(21):5430-5439.
APA	Kan, Wenjing.,Zhu, Liping.,Wei, Ying.,Ma, Dongge.,Sun, Mingzhi.,...&Xu, Hui.(2015).Phosphine oxide-jointed electron transporters for the reduction of interfacial quenching in highly efficient blue PHOLEDs.JOURNAL OF MATERIALS CHEMISTRY C,3(21),5430-5439.
MLA	Kan, Wenjing,et al."Phosphine oxide-jointed electron transporters for the reduction of interfacial quenching in highly efficient blue PHOLEDs".JOURNAL OF MATERIALS CHEMISTRY C 3.21(2015):5430-5439.