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Highly Efficient Hybrid White Tandem Organic Light‐Emitting Diodes with MoO 3 Layer
Author(s) -
Duan Lian,
Tsuboi Taiju,
Qiu Yong
Publication year - 2015
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201500266
Subject(s) - chemistry , tandem , oled , electroluminescence , phosphorescence , diode , layer (electronics) , bilayer , fluorescence , optoelectronics , luminance , voltage , analytical chemistry (journal) , optics , materials science , organic chemistry , electrical engineering , physics , engineering , biochemistry , membrane , composite material
Electroluminescence (EL) characteristics have been studied for a hybrid tandem white organic light emitting diode (OLED) with a blue emitting fluorescent EL1 unit based on BCzVBi and a yellow emitting phosphorescent EL2 unit based on (fbi) 2 Ir(acac), where a MoO 3 layer is inserted between EL1 and EL2 units as charge generation layer (CGL). Maximum current and power efficiencies of 68.1 cd/A and 29.2 lm/W were obtained, respectively, while the current and power efficiencies at luminance of 1000 cd/m 2 were 68.0 cd/A and 24.6 lm/W. The yellow emission appears from about 4.5 V firstly, while the blue emission starts to appear from about 5.4 V. It was found that charge generation from CGL of MoO 3 /NPB bilayer occurred at high voltages of above 5.4 V but not at low voltages below 5.2 V.
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