Abstract
We report a new Iridium(III) complex and the study of its optical, electrochemical and electroluminescence properties. The crystal structure shows an octahedral environment around Ir(III) center. Density functional theory (DFT) calculations indicate the contribution of the d-orbitals of Ir and the π-orbitals of the cyclometalating and ancillary ligands toward HOMO, whereas LUMO is concentrated on only the cyclometalating ligand. These complexes emit in the sky blue color region from an admixture of triplet metal-to-ligand-charge-transfer (3MLCT) and ligand π-π* states. A maximum external (ηex) quantumefficiency and luminance efficiency of 2.4% and 5.5 cd/A at 0.12 mA/cm2 was obtained from the device consisting of a 5% doped polymeric and low molecular host. A maximum brightness of 10,200 cd/m2 at 14.8 V was obtained from the device.
Similar content being viewed by others
References
R. J. Holmes, S. R. Forrest, Y.-J. Tung, R. C. Kwong, J. J. Brown, S. Garon, M. E. Thompson, Appl. Phys. Lett. 82, 2422, (2003).
S-J. Yeh, M-F. Wu, C-T. Chen, Y-H. Song, Y. Chi, M-H. Ho, S-F. Hsu, C. H. Chen, Adv. Mater., 17, 285 (2005).
C-L. Li, Y-J. Su, Y-T. Tao, P-T. Chou, C-H. Chien, C-C. Cheng, S-R. Liu, Adv. Func. Mater. 15, 387, (2005).
X. Chen, J-L. Liao, Y. Liang, M.O. Ahmed, H-E. Tseng, S. A. Chen, J. Am. Chem. Soc. 125, 636, (2003).
A. Nakamura, T. Tada, M. Mizukami, S. Yagyu, Appl. Phys. Lett. 84, 130, (2004).
Sprouse, S.; King, K. A.; Spellane, P.J.; Watts, R. J. J. Phys. Chem. 106, 6647, (1984).
R. R. Das etal. Unpublished result.
M. G. Colombo, T. C. Brunold, T. Riedener, H. U. Gudel, M. Fortsch, H-B. Burgi, Inorg. Chem. 33, 545, (1994).
A. J. Bard, L. R. Faulkner, Electrochemical Methods: Fundamentals and Applications, 2nd ed., New York: Wiley, p. 811, (2001).
F. Rabeck, Mechanisms of Photophysical Processes and Photochemical Reactions in Polymers: Theory and Applications, Wiley, Chichester, (1987)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
R Das, R., Kwon, O., Byun, Y. et al. A New Bis-Cyclometalated Iridium (III) Complex as a Triplet Emitter in Organic Light Emitting Devices. MRS Online Proceedings Library 871, 621 (2005). https://doi.org/10.1557/PROC-871-I6.21
Published:
DOI: https://doi.org/10.1557/PROC-871-I6.21