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Nonconjugated Carbazoles: A Series of Novel Host Materials for Highly Efficient Blue Electrophosphorescent OLEDs
He, Jian1; Liu, Hongmei1; Dai, Yanfeng2; Ou, Xuemei1; Wang, Jing1; Tao, Silu1; Zhang, Xiaohong1; Wang, Pengfei1; Ma, Dongge2
2009-04-23
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY C
ISSN1932-7447
Volume113Issue:16Pages:6761-6767
AbstractA series of carbazole derivatives was synthesized and their electrical and photophysical properties were investigated. It is shown that the triplet energy levels of these hosts are higher than that of the most popular blue phosphorescent material iridium(III) bis[(4,6-difluorophenyl)pyridinato-N,C(2')] picolinate (FIrpic) and the most extensively used phosphorescent host material 4,4'-N,N'-dicarbazole-biphenyl (CBP). These new host materials also showed good thermal stability and high glass transition temperatures (T(g)) ranging from 78 to 115 degrees C as the linkage group between the carbazoles was altered. Photophysical measurements indicate that the energy transfer between these new hosts and FIrpic is more efficient than that between CBP and FIrpic. Devices incorporating these novel carbazole derivatives as the host material doped with FIrpic were fabricated with the configurations of ITO/NPB (40 nm)/host:FIrpic (30 nm)/BCP (15 nm)/AlQ (30 nm)/LiF (1 nm)/Al (150 nm). High efficiencies (up to 13.4 cd/A) have been obtained when 1,4-bis (4-(9H-carbazol-9-yl)phenyl)cyclohexane (CBPCH) and bis(4-(9H-carbazol-9-yl)phenyl) ether (CBPE) were used as the host, respectively. Efficiencies obtained from these devices are significantly higher than the efficiency obtained with CBP as the host. At a bias voltage of similar to 20 V the maximum luminances of 20 342 and 17 766 cd/m(2) were achieved for CBPCH- and CBPE-based devices, respectively, which demonstrates that CBPCH and CBPE can be excellent host materials for blue electrophosphorescent OLEDs.
DOI10.1021/jp808801q
Indexed BySCI
Language英语
WOS IDWOS:000265383300059
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:81[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/68412
Collection中国科学院化学研究所
Corresponding AuthorZhang, Xiaohong
Affiliation1.Chinese Acad Sci, Tech Inst Phys & Chem, Nanoorgan Photoelect Lab, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
He, Jian,Liu, Hongmei,Dai, Yanfeng,et al. Nonconjugated Carbazoles: A Series of Novel Host Materials for Highly Efficient Blue Electrophosphorescent OLEDs[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2009,113(16):6761-6767.
APA He, Jian.,Liu, Hongmei.,Dai, Yanfeng.,Ou, Xuemei.,Wang, Jing.,...&Ma, Dongge.(2009).Nonconjugated Carbazoles: A Series of Novel Host Materials for Highly Efficient Blue Electrophosphorescent OLEDs.JOURNAL OF PHYSICAL CHEMISTRY C,113(16),6761-6767.
MLA He, Jian,et al."Nonconjugated Carbazoles: A Series of Novel Host Materials for Highly Efficient Blue Electrophosphorescent OLEDs".JOURNAL OF PHYSICAL CHEMISTRY C 113.16(2009):6761-6767.
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