Premium
Low‐voltage and high‐stability p‐type doped blue organic light‐emitting diodes with bilayer hole‐injection layers
Author(s) -
Lu Lin,
Yu Jianning,
Long Li,
Yu Fangfang,
Zhang Jianhua,
Zhang Hao,
Wei Bin
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201084161
Subject(s) - oled , triphenylamine , materials science , doping , diode , bilayer , optoelectronics , luminance , layer (electronics) , diffusion , optics , chemistry , nanotechnology , membrane , physics , biochemistry , thermodynamics
We report low‐voltage and high‐stability blue organic light‐emitting diodes (OLEDs) with a peak at 470 nm, which are composed of tetrafluorotetracyano‐quinodimethane (F4‐TCNQ) doped 4,4′4″‐Tris(N‐(2‐naphthyl)‐N‐phenyl‐amino)‐triphenylamine(2T‐NATA) and additional 2T‐NATA as a hole injection layer. Compared to undoped devices, the operating voltage of p‐type doped blue OLEDs can decrease by 1.5 V. Furthermore, the use of 2T‐NATA as a blocking layer to fluorine diffusion was found to improve device lifetime and chromatic stability greatly, the half‐luminance decay reached about 3800 h at the initial luminance of 3000 cd/m 2 . The role of the thickness of F4‐TCNQ doped 2T‐NATA has also been investigated.