Efficient hybrid white organic light-emitting diodes with extremely long lifetime: the effect of n-type interlayer

• DOI: 10.1038/srep07198
• Publication Date: 2014-11-26T10:16:28Z
• Authors: Baiquan Liu; Lei Wang; Miao Xu; Hong Tao; Jianhua Zou; Dongyu Gao; Linfeng Lan; Honglong Ning; Junbiao Peng; Yong Cao
• Keywords: Quantum Efficiency

The effect of n-type interlayer in hybrid white organic light-emitting diodes (WOLEDs) has been systematically investigated by using various materials. A new finding, that the triplet energy rather than electron mobility or hole-blocking ability plays a more positive role performance WOLEDs, is demonstrated. Based on efficient bis[2-(2-hydroxyphenyl)-pyridine] beryllium employed to realize high-performance WOLED. resulting device (without n-doping technology) exhibits low voltages (i.e., 2.8 V for 1 cd/m(2), 3.9 100 cd/m(2)) and efficiency roll-off 11.5 cd/A at cd/m(2) 11.2 1000 cd/m(2)). At display-relevant luminance total power 16.0 lm/W, color rendering index 73 an extremely long lifetime 12596265 h are obtained. Such superior results not only comprehensively indicate materials effective interlayers develop WOLEDs but also demonstrate significant step towards real commercialization WOLEDs.