13 September 2012 Extremely high-efficiency multiphoton emission blue phosphorescent OLEDs with external quantum efficiency exceeding 40%
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Abstract
We developed high-efficiency multi-photon emission (MPE) blue phosphorescent OLEDs with external quantum efficiency exceeding 40% at 100 cd m–2. In these MPE devices, we used a blue phosphorescent emitter, FIrpic and pyridine-containing electron-transporters, 3,5,3’’,5’’-tetra-3-pyridyl-[1,1’;3’,1’]terphenyl (B3PyPB) and bis-4,6-(3,5- dipyridylphenyl)-2-methylpyrimidine derivatives (B3PyMPM, B4PyMPM). We also used a well-known electrontransporter, 2,9-dimethyl-4,7-diphenylphenanthroline (BCP) for comparison. We used a combination of TAPC/MoO3/Al/Liq layers as the charge-generation layer unit. An optimized MPE device showed an extremely high current efficiency of over 90 cd A–1 and a high power efficiency of over 40 lm W–1 at 100 cd m–2 without any outcoupling enhancement.
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Hisahiro Sasabe, Hisahiro Sasabe, Kazuhiro Minamoto, Kazuhiro Minamoto, Yong-Jin Pu, Yong-Jin Pu, Masakatsu Hirasawa, Masakatsu Hirasawa, Junji Kido, Junji Kido, } "Extremely high-efficiency multiphoton emission blue phosphorescent OLEDs with external quantum efficiency exceeding 40%", Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 847604 (13 September 2012); doi: 10.1117/12.927997; https://doi.org/10.1117/12.927997
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