Journal
ORGANIC ELECTRONICS
Volume 11, Issue 4, Pages 564-572Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2009.12.014
Keywords
Phosphorescent organic light-emitting diodes (PhOLEDs); Iridium complex; Deep-blue emitter; External quantum efficiency; Picolinic acid N-oxide ancillary ligand
Funding
- Ministry of Education, Science and Technology [2009K000069]
- Korea Science and Engineering Foundation (KOSEF)
- Korea government (MEST) [M10600000157-06J0000-15710]
- Strategic Technology under Ministry of Knowledge Economy of Korea
- National Research Foundation of Korea [핵06B3010, 2006-0051065, 14-2008-01-001-00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A new series of highly efficient deep-blue phosphorescent Ir(III) complexes, (F(2)CH(3)ppy)(2)-Ir(pic-N-oxide) 6 and (F(2)CF(3)CH(3)ppy)(2)Ir(pic-N-oxide) 7, based on phenylpyridine (ppy) as the main ligand and picolinic acid N-oxide (pic-N-oxide) as the ancillary ligand, were synthesized for applications in phosphorescent organic light-emitting diodes (PhOLEDs). The photophysical, electrochemical, and electroluminescent (EL) properties of these substances were investigated. The energy levels of these substances were adjusted by the introduction of electron-donating and electron-withdrawing substituents on the ppy ligand. The Ir(III) complexes have high phosphorescent quantum yields as well as high thermal stability. High performance PhOLEDs fabricated using the Ir(III) complexes showed bright deep-blue emissions with the Commission Internationale de L'Eclairage (CIE) coordinates of (0.147, 0.210) at the current density of 0.1 mA/cm(2), and high external quantum (23.3%) and current (36.1 cd/A) efficiencies. (C) 2009 Elsevier B.V. All rights reserved.
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