The DOI matches its Crossref record; 12 of the 12 references it cites were found in a registry or an index.
Homoleptic Cyclometalated Iridium Complexes with Highly Efficient Red Phosphorescence and Application to Organic Light-Emitting Diode
Abstract
Phosphorescence studies of a series of facial homoleptic cyclometalated iridium(III) complexes have been carried out. The complexes studied have the general structure Ir(III)(C-N)(3), where (C-N) is a monoanionic cyclometalating ligand: 2-(5-methylthiophen-2-yl)pyridinato, 2-(thiophen-2-yl)-5-trifluoromethylpyridinato, 2,5-di(thiophen-2-yl)pyridinato, 2,5-di(5-methylthiophen-2-yl)pyridinato, 2-(benzo[b]thiophen-2-yl)pyridinato, 2-(9,9-dimethyl-9H-fluoren-2-yl)pyridinato, 1-phenylisoquinolinato, 1-(thiophen-2-yl)isoquinolinato, or 1-(9,9-dimethyl-9H-fluoren-2-yl)isoquinolinato. Luminescence properties of all the complexes at 298 K in toluene are as follows: quantum yields of phosphorescence Phi(p) = 0.08-0.29, emission peaks lambda(max) = 558-652 nm, and emission lifetimes tau = 0.74-4.7 micros. Bathochromic shifts of the Ir(thpy)(3) family [the complexes with 2-(thiophen-2-yl)pyridine derivatives] are observed by introducing appropriate substituents, e.g., methyl, trifluoromethyl, or thiophen-2-yl. However, Phi(p) of the red emissive complexes (lambda(max) > 600 nm) becomes small, caused by a significant decrease of the radiative rate constant, k(r). In contrast, the complexes with the 1-arylisoquinoline ligands are found to have marked red shifts of lambda(max) and very high Phi(p) (0.19-0.26). These complexes are found to possess dominantly (3)MLCT (metal-to-ligand charge transfer) excited states and have k(r) values approximately 1 order of magnitude larger than those of the Ir(thpy)(3) family. An organic light-emitting diode (OLED) device that uses Ir(1-phenylisoquinolinato)(3) as a phosphorescent dopant produces very high efficiency (external quantum efficiency eta(ex) = 10.3% and power efficiency 8.0 lm/W at 100 cd/m(2)) and pure-red emission with 1931 CIE (Commission Internationale de L'Eclairage) chromaticity coordinates (x = 0.68, y = 0.32).
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Citations
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Cited by
Crystallization-Induced Phosphorescence of Pure Organic Luminogens at Room Temperature
Yuan, W. Z., Shen, X. Y., Zhao, H., Lam, J. W. Y., Tang, L., Lu, P., Wang, C., Liu, Y., Wang, Z., Zheng, Q., et al. (2010) · The Journal of Physical Chemistry C · doi:10.1021/jp909388y · Cited by 989
Recent Developments in the Application of Phosphorescent Iridium(III) Complex Systems
Ulbricht, C., Beyer, B., Friebe, C., Winter, A., & Schubert, U. S. (2009) · Advanced Materials · doi:10.1002/adma.200803537 · Cited by 746
You, Y., & Nam, W. (2012) · Chemical Society Reviews · doi:10.1039/c2cs35171d · Cited by 668
Hsu, C.-W., Lin, C.-C., Chung, M.-W., Chi, Y., Lee, G.-H., Chou, P.-T., Chang, C.-H., & Chen, P.-Y. (2011) · Journal of the American Chemical Society · doi:10.1021/ja2026568 · Cited by 365
Choy, W. C. H., Chan, W. K., & Yuan, Y. (2014) · Advanced Materials · doi:10.1002/adma.201306133 · Cited by 317
Metadata
- Authors
- Tsuboyama, A., Iwawaki, H., Furugori, M., Mukaide, T., Kamatani, J., Igawa, S., Moriyama, T., Miura, S., Takiguchi, T., Okada, S., Hoshino, M., & Ueno, K.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2003-09-27
- Volume
- 125
- Issue
- 42
- Pages
- 12971-12979
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2158422033
- Cited by
- 1,312
- References
- 12
- FWCI
- 41.56
- Type
- journal article
- Language
- en
- Open access
- closed
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