Tuning the Photophysical Properties and Energy Levels by Linking Spacer and Topology between the Benzimidazole and Carbazole Units: Bipolar Host for Highly Efficient Phosphorescent OLEDs

	Tuning the Photophysical Properties and Energy Levels by Linking Spacer and Topology between the Benzimidazole and Carbazole Units: Bipolar Host for Highly Efficient Phosphorescent OLEDs
	Gong SL ; Zhao YBA ; Yang CL ; Zhong C ; Qin JG ; Ma DG
刊名	journal of physical chemistry c
	2010
卷号	114 期号:11 页码:5193-5198
关键词	LIGHT-EMITTING-DIODES CYCLOMETALATED IRIDIUM COMPLEXES ORGANIC ELECTROLUMINESCENT DEVICES SINGLE-LAYER ELECTROPHOSPHORESCENT DEVICES BLUE TRANSPORT GREEN EMITTERS DERIVATIVES
ISSN号	1932-7447
通讯作者	yang cl
中文摘要	a new series of benzimidazole hybrids with different linking spacers or linking topologies between the benzimidazole and carbazole moieties were facilely prepared, and their thermal, photophysical, and electrochemical properties were investigated. with the incorporation of rigid benzimidazole moiety, these compounds possess excellent thermal stability with high glass-transition temperatures (t-g) of 137-186 degrees c and the thermal-decomposition temperatures (t-d) of 479-544 degrees c. 2 and 3 with the m-terphenyl unit as the linking spacer between the carbazole and the benzimidazole moieties exhibit significant blue shifts as compared to i and 4 with the phenyl unit because the longer linking spacer alleviate intramolecular charge transfer. their homo and lumo energy levels vary in the range of 5.50-5.63 and 2.02-2.35 ev, respectively. devices employing the new compounds as the host for the green emitter of ir(ppy)(3) were fabricated with the configurations of ito/moo3 (10 nm)/npb (80 nm)/host: 9 wt % ir(ppy)(3) (20 nm)/tpbi (40 nm)/lif (1 nm)/al(100 nm). their el efficiencies follow the order of 3 > 2 > 1; 4, which correlates with their triplet energy and the separation of homo and lumo distributions at hole- and electron-transporting moieties. a maximum current efficiency of 70.2 cd a(-1) and a maximum power efficiency of 73.4 lm w1- were achieved when 3 was used as the host. a facile strategy to manipulate the spatial distribution of energy levels and triplet energy of hosts by changing linking spacers of linking topologies is demonstrated.
收录类别	SCI收录期刊论文
语种	英语
WOS记录号	WOS:000275708600060
公开日期	2012-06-07
内容类型	期刊论文
源URL	[http://ir.ciac.jl.cn/handle/322003/43850]
专题	长春应用化学研究所_长春应用化学研究所知识产出_期刊论文
推荐引用方式 GB/T 7714	Gong SL,Zhao YBA,Yang CL,et al. Tuning the Photophysical Properties and Energy Levels by Linking Spacer and Topology between the Benzimidazole and Carbazole Units: Bipolar Host for Highly Efficient Phosphorescent OLEDs[J]. journal of physical chemistry c,2010,114(11):5193-5198.
APA	Gong SL,Zhao YBA,Yang CL,Zhong C,Qin JG,&Ma DG.(2010).Tuning the Photophysical Properties and Energy Levels by Linking Spacer and Topology between the Benzimidazole and Carbazole Units: Bipolar Host for Highly Efficient Phosphorescent OLEDs.journal of physical chemistry c,114(11),5193-5198.
MLA	Gong SL,et al."Tuning the Photophysical Properties and Energy Levels by Linking Spacer and Topology between the Benzimidazole and Carbazole Units: Bipolar Host for Highly Efficient Phosphorescent OLEDs".journal of physical chemistry c 114.11(2010):5193-5198.