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Lim JM, Kwon JY, Xu F, et al. Pure red phosphorescent organic light-emitting diodes made of iridium(III) complex with thiophene-quinoline ligand. J Nanosci Nanotechnol. 2013;13(12):8007-10doi: 10.1166/jnn.2013.8152.
Lim, J. M., Kwon, J. Y., Xu, F., Kim, H. U., & Hwang, D. H. (2013). Pure red phosphorescent organic light-emitting diodes made of iridium(III) complex with thiophene-quinoline ligand. Journal of nanoscience and nanotechnology, 13(12), 8007-10. https://doi.org/10.1166/jnn.2013.8152
Lim, Jong Min, et al. "Pure red phosphorescent organic light-emitting diodes made of iridium(III) complex with thiophene-quinoline ligand." Journal of nanoscience and nanotechnology vol. 13,12 (2013): 8007-10. doi: https://doi.org/10.1166/jnn.2013.8152
Lim JM, Kwon JY, Xu F, Kim HU, Hwang DH. Pure red phosphorescent organic light-emitting diodes made of iridium(III) complex with thiophene-quinoline ligand. J Nanosci Nanotechnol. 2013 Dec;13(12):8007-10. doi: 10.1166/jnn.2013.8152. PMID: 24266181.
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J Nanosci Nanotechnol. 2013 Dec;13(12):8007-10. doi: 10.1166/jnn.2013.8152.

Pure red phosphorescent organic light-emitting diodes made of iridium(III) complex with thiophene-quinoline ligand.

Journal of nanoscience and nanotechnology

Jong Min Lim, Ji-Young Kwon, Fei Xu, Hee Un Kim, Do-Hoon Hwang

Affiliations

  1. Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea.

PMID: 24266181 DOI: 10.1166/jnn.2013.8152

Abstract

A cyclometalated iridium(II) complex, bis(2-thiophen-2-yl-quinolinato)(acetoacetonate)iridium(II) [(tq)2Ir(III)(acac)] was synthesized for use in phosphorescent organic light-emitting diodes. The photophysical and electrochemical properties of the iridium(Ill) complex were characterized by UV-visible absorption, photoluminescence, and cyclic voltammetry. The maximum UV-visible absorption of (tq)2Ir(acac) was observed at 289 nm. (Tq)2Ir(acac) in dichloromethane showed its maximum photoluminescence (PL) emission at 629 nm. The optical band gap energy of (tq)2Ir(III)(acac) was measured to be 2.11 eV, and the HOMO energy level of (tq)2Ir(Ill)(acac) was calculated to be -5.08 eV. The T1 state of (tq)2Ir(lll)(acac), calculated from the PL emission maximum (2.01 eV), was well matched with the T1 level of CBP (2.6 eV). The phosphorescent organic light-emitting diode with a configuration of ITO/PEDOT:PSS/alpha-NPD/TCTA/CBP:(tq)2Ir(II)(acac)(8 wt%)/BCP/Alq3/LiF/Al was fabricated and characterized. Light emission from the device was observed at a low turn-on voltage of 4.3 V. The device showed a maximum brightness of 24,000 cd/m2 at 16.3 V and an external quantum efficiency of 11.1% with a Commission Internationale de l'Eclairage (CIE) coordinate of (0.690, 0.310).

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