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A Divergent Synthesis of Very Large Polyphenylene Dendrimers with Iridium(III) Cores: Molecular Size Effect on the Performance of Phosphorescent Organic Light-Emitting Diodes
Qin, Tianshi1; Ding, Junqiao3; Wang, Lixiang3; Baumgarten, Martin1; Zhou, Gang1,2; Muellen, Klaus1
2009-10-14
Source PublicationJOURNAL OF THE AMERICAN CHEMICAL SOCIETY
ISSN0002-7863
Volume131Issue:40Pages:14329-14336
AbstractThis is a first report on a novel divergent procedure to synthesize higher generation polyphenylene dendrimers with an Ir(III) core up to G4, which up to now is the largest Ir(III) dendrimer, having a molecular diameter of 8 nm. Our synthetic method provides a much higher yield (>80%) than earlier reported traditional convergent strategies (<35%). Moreover, with a stepwise synthesis, the molecular sizes are controlled by different dendrimer generations from G1 (R(1) approximate to 15 angstrom) to G4 (R(4) approximate to 40 angstrom). In this case, polyphenylene dendrons are used as a "matrix" which prevent iridium phosphorescent cores from triplet-triplet annihilation and improve their photoluminescence quantum yields (PLQYs). All dendrimers show strong phosphorescence at room temperature, and interestingly, their PLQYs tend to increase with subsequent generations up to 36% for G4 in solid state, almost 4 times of that of the nondendritic iridium complex. We also fabricated all generation dendrimers in phosphorescent organic light-emitting diodes (PhOLEDs) and investigated the relationship between the Ir(III) dendrimer sizes and the device performances. Our results indicate that dendrimer G3 possesses the highest efficiency device compared to other generation dendrimers, since its appropriate dendrimer size (R(3) approximate to 30 angstrom) can not only prevent intermolecular triplet-triplet annihilation, thereby increasing the PLQY, but also provide an effective charge carrier mobility from the periphery to the Ir(III) core.
DOI10.1021/ja905118t
Indexed BySCI ; IC ; CCR
Language英语
WOS IDWOS:000271271500070
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:112[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/66588
Collection中国科学院化学研究所
Corresponding AuthorZhou, Gang
Affiliation1.Max Planck Inst Polymer Res, D-55128 Mainz, Germany
2.Fudan Univ, Adv Mat Lab, Shanghai 200438, Peoples R China
3.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Qin, Tianshi,Ding, Junqiao,Wang, Lixiang,et al. A Divergent Synthesis of Very Large Polyphenylene Dendrimers with Iridium(III) Cores: Molecular Size Effect on the Performance of Phosphorescent Organic Light-Emitting Diodes[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2009,131(40):14329-14336.
APA Qin, Tianshi,Ding, Junqiao,Wang, Lixiang,Baumgarten, Martin,Zhou, Gang,&Muellen, Klaus.(2009).A Divergent Synthesis of Very Large Polyphenylene Dendrimers with Iridium(III) Cores: Molecular Size Effect on the Performance of Phosphorescent Organic Light-Emitting Diodes.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,131(40),14329-14336.
MLA Qin, Tianshi,et al."A Divergent Synthesis of Very Large Polyphenylene Dendrimers with Iridium(III) Cores: Molecular Size Effect on the Performance of Phosphorescent Organic Light-Emitting Diodes".JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 131.40(2009):14329-14336.
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