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Highly efficient bilayer green phosphorescent organic light emitting devices
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We present a highly efficient green phosphorescent device comprising only of two organic layers. A host material bis[2-(2-hydroxyphenyl)-pyridine]beryllium having a good electron transporting and energy transfer characteristics, and a wide band gap hole transportmaterial-di(4-(-diphenyl-amino)phenyl)--diphenylbenzidine lead to the fabrication of a simplified high efficiency device. The driving voltage value of to reach a luminance of is reported. The maximum current- and power-efficiency values of and are demonstrated in this device. Results reveal a practical way to fabricate highly efficient truly bilayer organic devices for trouble-free manufacturing processes.
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