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Molecular design of host materials based on triphenylamine/oxadiazole hybrids for excellent deep-red phosphorescent organic light-emitting diodes
Tao, Youtian1; Wang, Qiang2,3; Ao, Liang1; Zhong, Cheng1; Qin, Jingui1; Yang, Chuluo1; Ma, Dongge2
2010
Source PublicationJOURNAL OF MATERIALS CHEMISTRY
ISSN0959-9428
Volume20Issue:9Pages:1759-1765
AbstractA series of triphenylamine/oxadiazole hybrids, p-TPA-p-OXD(1a), o-TPA-p-OXD (1b), p-TPA-mOXD (2a) and o-TPA-m-OXD (2b),were designed, synthesized and characterized as bipolar transport host materials for deep-red phosphorescent organic light-emitting diodes (OLEDs). The ortho-TPA linked hybrids (1b and 2b) show less intramolecular charge transfer, blue-shifted emission, wider energy gap, and higher triplet energy as compared to their para-TPA linked analogues (1a and 2a). Phosphorescent organic light-emitting devices (PHOLEDs) fabricated by using the four hybrids as the hosts and the red emitter bis(1-phenylisoquinolinato)(acetylacetonate) iridium [(piq)(2)Ir(acac)] as the guest exhibit much higher EL performances with maximum external quantum efficiencies of 9.8-21.6% and lower turn-on voltages (2.7-3.1 V) compared with the reference device with common 4,4'-bis(N-carbazolyl) biphenyl (CBP) as a host material (4.3%, 5.3 V). The external quantum efficiency of 21.6% achieved by using o-TPA-m-OXD as host is the highest for deep-red electrophosphorescence with the Commission Internationale de l'Eclairage (CIE) coordinates of (0.68, 0.32) reported in the literature to date. Green electrophosphorescence devices by using Ir(ppy)(3) as guest and 1b, 2a and 2b as hosts also show excellent EL performances with maximum external quantum efficiencies of 17.1-19.6%. This work demonstrates that tradeoffs among bipolar property, triplet energy, energy gap and energy level can be realized through judicious molecular design for a host in phosphorescent OLEDs.
DOI10.1039/b920227g
Indexed BySCI
Language英语
WOS IDWOS:000274581000020
PublisherROYAL SOC CHEMISTRY
Citation statistics
Cited Times:99[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/69674
Collection中国科学院化学研究所
Corresponding AuthorYang, Chuluo
Affiliation1.Wuhan Univ, Dept Chem, Hubei Key Lab Organ & Polymer Optoelect 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
3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Tao, Youtian,Wang, Qiang,Ao, Liang,et al. Molecular design of host materials based on triphenylamine/oxadiazole hybrids for excellent deep-red phosphorescent organic light-emitting diodes[J]. JOURNAL OF MATERIALS CHEMISTRY,2010,20(9):1759-1765.
APA Tao, Youtian.,Wang, Qiang.,Ao, Liang.,Zhong, Cheng.,Qin, Jingui.,...&Ma, Dongge.(2010).Molecular design of host materials based on triphenylamine/oxadiazole hybrids for excellent deep-red phosphorescent organic light-emitting diodes.JOURNAL OF MATERIALS CHEMISTRY,20(9),1759-1765.
MLA Tao, Youtian,et al."Molecular design of host materials based on triphenylamine/oxadiazole hybrids for excellent deep-red phosphorescent organic light-emitting diodes".JOURNAL OF MATERIALS CHEMISTRY 20.9(2010):1759-1765.
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