Open AccessHigh-efficiency and high-stability phosphorescent OLED based on new Ir complex
Author(s) -
Jun Wang,
Xuedong Wei,
Haibo Rao,
Jianbo Cheng,
Yadong Jiang
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.1156
Subject(s) - phosphorescence , oled , materials science , optoelectronics , stability (learning theory) , computer science , optics , physics , nanotechnology , fluorescence , layer (electronics) , machine learning
Multi-layer phosphorescent OLED with (tpbi)2Ir(acac) was fabricated which has the structure: ITO/CuPc (40 nm)/α-NPD (45 nm)/CBP: (tpbi)2Ir(acac) (3%, 30 nm)/BCP (20 nm)/Alq3 (20 nm)/LiF (1 nm)/Al (100 nm). Absorption spectra, phosphorescence lifetime of Ir complex, and I-V-L characteristic of the device was tested. The current of the device under low applied voltage conforms to the Richaardon-Schotty emission, and shows linear relationship under high voltage. Gauss peak fit shows the OLED spectra to be composed of α-NPD peak(450 nm), (tpbi)2Ir(acac) main peak(518 nm) and shoulder peak(543 nm). Maximum power efficiency of PHOLED is 12.1 lm/W (at 6V) with luminance 136 cd/m2, and the maximum luminance is 13500 cd/m2 with power efficiency 0.584 lm/W.