Low Turn-on Voltage, High-Power-Efficiency, Solution-Processed Deep-Blue Organic Light-Emitting Diodes Based on Starburst Oligofluorenes with Diphenylamine End-Capper to Enhance the HOMO Level

doi:10.1021/cm4039522

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	Low Turn-on Voltage, High-Power-Efficiency, Solution-Processed Deep-Blue Organic Light-Emitting Diodes Based on Starburst Oligofluorenes with Diphenylamine End-Capper to Enhance the HOMO Level
	Liu, Cui 1; Fu, Qiang 2; Zou, Yang 1; Yang, Chuluo 1; Ma, Dongge 2; Qin, Jingui 1
刊名	CHEMISTRY OF MATERIALS
	2014-05-27
卷号	26 期号:10 页码:3074-3083
ISSN号	0897-4756
DOI	10.1021/cm4039522
英文摘要	Two new star-shaped oligofluorenes, HFB-diF-Dpa and HFB-terF-Dpa, with a hexakis(fluoren-2-yl)benzene core and six diphenylamine end-cappers were designed and synthesized. The peripheral diphenylamine groups enhance the HOMO energy levels of the materials, and the bulky star-shaped structures efficiently suppress the intermolecular interaction. Their thermal, photophysical, and electrochemical properties were investigated. The two compounds display strong deep-blue emission both in solution and solid state. Solution-processed devices based on these starbursts exhibit highly efficient and stable deep-blue electroluminescence. Their high-lying HOMO energy levels match very well with that of the hole-injecting material. The double-layered device featuring HFB-diF-Dpa as emitter shows a low turn-on voltage of 3.6 V, a maximum current efficiency of 6.99 cd A(-1), and a maximum external quantum efficiency of 5.45% with the CIE coordinate of (0.154, 0.136). In particular, the combination of low driving voltage and high EQE provides an outstanding maximum power efficiency of 6.10 lm W-(1), which is the highest for nondoped deep-blue OLEDs based on solution-processable materials. Moreover, these devices present small values of efficiency roll-off at high brightness up to 1000 cd m(-2).
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000336637000008
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/50979]
专题	中国科学院化学研究所
通讯作者	Ma, Dongge
作者单位	1.Wuhan Univ, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect Mat, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Wuhan 430072, Peoples R China 2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Liu, Cui,Fu, Qiang,Zou, Yang,et al. Low Turn-on Voltage, High-Power-Efficiency, Solution-Processed Deep-Blue Organic Light-Emitting Diodes Based on Starburst Oligofluorenes with Diphenylamine End-Capper to Enhance the HOMO Level[J]. CHEMISTRY OF MATERIALS,2014,26(10):3074-3083.
APA	Liu, Cui,Fu, Qiang,Zou, Yang,Yang, Chuluo,Ma, Dongge,&Qin, Jingui.(2014).Low Turn-on Voltage, High-Power-Efficiency, Solution-Processed Deep-Blue Organic Light-Emitting Diodes Based on Starburst Oligofluorenes with Diphenylamine End-Capper to Enhance the HOMO Level.CHEMISTRY OF MATERIALS,26(10),3074-3083.
MLA	Liu, Cui,et al."Low Turn-on Voltage, High-Power-Efficiency, Solution-Processed Deep-Blue Organic Light-Emitting Diodes Based on Starburst Oligofluorenes with Diphenylamine End-Capper to Enhance the HOMO Level".CHEMISTRY OF MATERIALS 26.10(2014):3074-3083.