Low-voltage and high-stability p-type doped blue organic light-emitting diodes with bilayer hole-injection layers

✍ Scribed by Lu, Lin ;Yu, Jianning ;Long, Li ;Yu, Fangfang ;Zhang, Jianhua ;Zhang, Hao ;Wei, Bin

• Book ID: 105366368
• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 258 KB
• Volume: 208
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.201084161

✦ Synopsis

Abstract

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.