Phosphorescence Color Tuning by Ligand, and Substituent Effects of Multifunctional Iridium(III) Cyclometalates with 9-Arylcarbazole Moieties

doi:10.1002/asia.200800226

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	Phosphorescence Color Tuning by Ligand, and Substituent Effects of Multifunctional Iridium(III) Cyclometalates with 9-Arylcarbazole Moieties
	Ho, Cheuk-Lam 1; Wang, Qi 3; Lam, Ching-Shan 1; Wong, Wai-Yeung 1,2; Ma, Dongge 3; Wang, Lixiang 3; Gao, Zhi-Qiang 2; Chen, Chin-Hsin 2; Cheah, Kok-Wai 2; Lin, Zhenyang 4
刊名	Chemistry-An Asian Journal
	2009
卷号	4 期号:1 页码:89-103
关键词	Carbazole Color Tuning Iridium Complexes Organic Light-emitting Diodes Phosphorescence
ISSN号	1861-4728
DOI	10.1002/asia.200800226
英文摘要	The synthesis, isomeric studies, and photophysical characterization of a series of multifunctional cyclometalated iridium(III) complexes containing a fluoro- or methyl-substituted 2[3-(N-plienylcarbazolyl)]pyridine molecular framework are presented. All of the complexes are thermally stable solids and highly efficient electrophosphors. The optical, electrochemical, photo-, and electrophosphorescence traits of these iridium phosphors have been studied in terms of the electronic nature and coordinating site of the aryl or pyridyl ring substituents. The correlation between the functional properties of these phosphors and the results of density functional theory calculations was made. Arising from the propensity of the electron-rich carbazolyl group to facilitate hole injection/transport, the presence of such a moiety can increase the highest-occupied molecular orbital levels and improve the charge balance in the resulting complexes relative to the parent phosphor with 2-phenylpyridine ligands. Remarkably, the excited-state properties can be manipulated through ligand and substituent effects that allow the tuning of phosphorescence energies from bluish green to deep red. Electrophosphorescent organic light-emitting diodes (OLEDs) with outstanding device performance can be fabricated based on these materials, which show a maximum current efficiency of approximately 43.4 cd A(-1), corresponding to an external quantum efficiency of approximately 12.9% ph/el (photons per electron) and a power efficiency of approximately 33.4 Lm W(-1) for the best device. The present work provides a new avenue for the rational design of multifunctional iridium-carbazolyl electrophosphors, by synthetically tailoring the carbazolyl pyridine ring that can reveal a superior device performance coupled with good color-tuning versatility, suitable for multicolor-display technology.
语种	英语
出版者	WILEY-V C H VERLAG GMBH
WOS记录号	WOS:000262582400010
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/68565]
专题	中国科学院化学研究所
通讯作者	Wong, Wai-Yeung
作者单位	1.Hong Kong Baptist Univ, Dept Chem, Kowloon, Hong Kong, Peoples R China 2.Hong Kong Baptist Univ, Ctr Adv Luminescence Mat, Kowloon, Hong Kong, Peoples R China 3.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 4.Hong Kong Univ Sci & Technol, Dept Chem, Hong Kong, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Ho, Cheuk-Lam,Wang, Qi,Lam, Ching-Shan,et al. Phosphorescence Color Tuning by Ligand, and Substituent Effects of Multifunctional Iridium(III) Cyclometalates with 9-Arylcarbazole Moieties[J]. Chemistry-An Asian Journal,2009,4(1):89-103.
APA	Ho, Cheuk-Lam.,Wang, Qi.,Lam, Ching-Shan.,Wong, Wai-Yeung.,Ma, Dongge.,...&Lin, Zhenyang.(2009).Phosphorescence Color Tuning by Ligand, and Substituent Effects of Multifunctional Iridium(III) Cyclometalates with 9-Arylcarbazole Moieties.Chemistry-An Asian Journal,4(1),89-103.
MLA	Ho, Cheuk-Lam,et al."Phosphorescence Color Tuning by Ligand, and Substituent Effects of Multifunctional Iridium(III) Cyclometalates with 9-Arylcarbazole Moieties".Chemistry-An Asian Journal 4.1(2009):89-103.