화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.583, No.1, 180-186, 2013
Low Driving Voltage and High Efficiency Blue Phosphorescent OLEDs with Mixed Host System
We report both low driving voltage and high efficiency characteristics in blue phosphorescent organic light-emitting diodes with a simple device structure. A mixed host system consisting of narrow band-gap host material of 4,4',4''-tris(N-carbazolyl)triphenylamine (TCTA) and bipolar carrier transporting material of 2,6-bis(3-(carbazol-9-yl)phenyl)pyridine (26DCzPPy) shows low driving voltage performances with high luminance stability. A very low onset voltage of 3.0V and a driving voltage of 3.8V to obtain a brightness of 1000 cd/m(2)are achieved with a current efficiency of 44.2 cd/A.