Yellow Luminescence Iridium Complex and its Composite with Polymers

Abstract:

Yellow light-emitting heteroleptic iridium complex with 2-(4-bromophenyl) -1H-benzo [d] imidazole as cylcometalated ligand and 5,5'-dimethyl-2,2'-dipyridyl as the ancillary ligand was synthesized and characterized by ¹H NMR, elemental analysis and IR. The poly (methyl methacrylate)(PMMA) and poly (ethyl acrylate carbazole)(PEAK) doped with the complex were prepared by solution method. The photoluminescent properties of the complex and polymers were studied. The results show that the complex exhibits yellow luminescence with the emission peak of 562nm and CIE coordinates of (0.439, 0.502) upon 365nm excitation. The polymers transfer effectively intermolecular energy to the iridium complex, which results in effective yellow emission for the doped polymers.

• Periodical: Advanced Materials Research (Volumes 1004-1005)
• Pages: 354-357
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1004-1005.354
• Online since: August 2014
• Authors: Mei Juan Lin, Hui Juan Zeng, Qiang Tang, Qi Dan Ling*
• Keywords: 2-(4-bromophenyl)-1H-benzo [d] Imidazole, Iridium Complex, Peak, Photoluminescence (PL), PMMA

References

[1] M. Baldo, M. Segal, Phosphorescence as a probe of exciton formation and energy transfer in organic light emitting diodes, Phys. Stat. Sol. (a). 201 (2004) 1205-1214.

DOI: 10.1002/pssa.200404344

[2] J. Kido, M. Kohda, K. Okuyama, K. Nagai, Organic electroluminescent devices based on molecularly doped polymers, Appl. Phys Lett. 61 (1992) 761-763.

DOI: 10.1063/1.107790

[3] S. Lamansky, P. Djurovich, D. Murphy, et al, Highly phosphorescent bis-cyclometalated iridium complexes: synthesis, photophysical characterization, and use in organic light emitting diodes, J. Am. Chem. Soc. 123 (2001) 4304-4312.

DOI: 10.1021/ja003693s

[4] P. Coppo, E. A. Plummer, L. De Cola, Tuning iridium(III) phenylpyridine complexes in the almost blue, region, Chem. Commun. 15 (2004) 1774-1775.

DOI: 10.1039/b406851c

[5] S. J. Yeh, M. F. Wu, C.T. Chen, et al, New dopant and host materials for blue-light emitting phosphorescent organic electroluminescent devices, Adv. Mater. 17 (2005) 285-289.

DOI: 10.1002/adma.200401373

[6] R. Ragni, E. A. Plummer, K. Brunner, et al, Blue emitting iridium complexes: synthesis, photophysics and phosphorescent devices, J. Mater. Chem. 16 (2006) 1161-1170.

DOI: 10.1039/b512081k

[7] H. Xu, D. H. Yu, L. L. Liu, et al, Small molecular glasses based on multiposition encapsulated phenyl benzimidazole iridium(III) complexes: toward efficient solution-processable host-free electrophosphorescent diodes, J. Phys. Chem. B. 114 (2010).

DOI: 10.1021/jp909297d

[8] P. M. Jahani, A. Nowroozi, Conformational analysis, tautomeric preference, intramolecular hydrogen bonding, and solvent effect on dinitrosamine: a quantum chemical study, Int. J. Quantum Chem. 113 (2013) 1026-1033.

DOI: 10.1002/qua.24115