Journal
JOURNAL OF INFORMATION DISPLAY
Volume 14, Issue 3, Pages 109-113Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15980316.2013.837106
Keywords
OLED; yellow; blue; tandem; white; two-peak
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Funding
- Industrial Strategic Technology Development Program [10028439]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) Human Resources Development Program [20134010200490]
- Ministry of Trade, Industry, and Energy of the Republic of Korea
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Reported herein are highly efficient yellow phosphorescent organic light-emitting diodes for tandem white organic light-emitting diode (WOLED) applications. The fabricated device structure was ITO/di-[4-(N, N-ditolyl- amino)-phenyl] cyclohexane(TAPC)(50 nm)/bis[2-(2-hydroxyphenyl)-pyridine] beryllium(Bepp2): iridium(III) bis(4( 4-t-butylphenyl) thieno [3,2-c] pyridinato-N, C-2') acetylacetonate)(Ir(tptpy) 2(acac))(10 nm)/(1,3,5-tri[(3-pyridyl)-phen-3yl] benzene(TmPyPB)(40 nm)/LiF (1.5 nm)/Al(100 nm). The extremely high 25.0% external quantum efficiency (EQE), the 84.4 cd/Acurrent efficiency, and the 90.7 lm/Wpower efficiency are reported, with Commission Internationale de L'Eclairage (CIE) coordinates of (0.49, 0.50). Such good performances are attributed to the good exciton confinement structure fabricated herein, and the highly efficient yellow dopant. The white tandem device was fabricated by utilizing this yellow device with the authors' phosphorescent blue-OLED unit. An excellent 67.2 lm/Wpower efficiency and a 48.6% EQE with CIE coordinates of (0.39, 0.49) were obtained.
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