Journal
THIN SOLID FILMS
Volume 517, Issue 13, Pages 3788-3791Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2009.01.013
Keywords
Organic light emitting devices; Efficiency; Phosphorescence; Hole-blocking material; Photoluminescence; Electroluminescence
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Funding
- National Science Council [NSC-94-2215-E-006-008]
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We demonstrate high-efficiency red electrophosphorescent organic light-emitting devices (OLEDs) by doping a red-emitting iridium complex, Bis[7-methyl-1-p-tolyisoquinolinato-N,C-2']-iridium (III) (acetylacetonate) [(7-mtiq)(2)Ir(acac)], into a hole-blocking material, 4-biphenyloxolato aluminum(III)bis(2-methyl-8-quinolinato)4-phenylphenolate. Both the phosphorescent characteristics of (7-mtiq)(2)Ir(acac) and the electroluminescence mechanisms of OLEDs are investigated in this study. The Commission Internationale de L'Eclairage coordinates of (0.66, 034) is very close to the National Television System Committee standard red point (0.66, 033). With a dopant concentration of about 4%, a maximum luminance of 31317 cd/m(2) and a luminous efficiency of 21.6 cd/A have been obtained. (C) 2009 Elsevier B.V. All rights reserved.
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