P-186: Enhanced Efficiency and Stability of Organic Light-Emitting Diodes with Copper Hexadecafluorophthalocyanine Doped Hole Transport Layer

We report the enhancement of the electroluminescence (EL) efficiency and the device stability of organic light-emitting diodes (OLEDs) by inserting a copper hexadecafluorophthalocyanine (F16CuPC)-doped N,N′-di(1-naphthyl)-N,N′-diphenylbenzidine (α-NPD) layer between an indium-tin oxide and α-NPD. Compared with the reference device consisting of the bilayer structure of α-NPD and tris(8-hydroxyquinoline) aluminum (Alq3), the devices having F16CuPC-doped α-NPD show not only an increased EL efficiency (∼4.5 cd/A compared with ∼3.8 cd/A for the reference device) and lower driving voltage but also a longer lifetime and smaller operating voltage variation over time. It is suggested that the improved device performance can be attributed to the higher hole-injection efficiency and thermal stability of the F16CuPC-doped α-NPD layer.

[1]  C. Lee.  Enhanced efficiency and durability of organic electroluminescent devices by inserting a thin insulating layer at the Alq3/cathode interface , 1997 .

[2]  Marie Angelopoulos,et al.  Polymeric anodes for improved polymer light-emitting diode performance , 1997 .

[3]  C. Tang,et al.  Enhanced electron injection in organic electroluminescence devices using an Al/LiF electrode , 1997 .

[4]  Yongli Gao,et al.  Tuning the Carrier Injection Efficiency for Organic Light-Emitting Diodes† , 2000 .

[5]  Franco Cacialli,et al.  Contact optimization in polymer light-emitting diodes , 2003 .

[6]  Hiroshi Inada,et al.  Multilayered organic electroluminescent device using a novel starburst molecule, 4,4’,4‘‐tris(3‐methylphenylphenylamino)triphenylamine, as a hole transport material , 1994 .

[7]  Ching Wan Tang,et al.  Organic electroluminescent devices with improved stability , 1996 .

[8]  Shui-Tong Lee,et al.  Conducting fluorocarbon coatings for organic light-emitting diodes , 2004 .

[9]  M. Knupfer,et al.  Energy level alignment at organic/metal interfaces: Dipole and ionization potential , 2002 .

[10]  C. Tang,et al.  Organic Electroluminescent Diodes , 1987 .

[11]  H. Chung,et al.  Improved blue light-emitting polymeric device by the tuning of drift mobility and charge balance , 2004 .

[12]  L. Dunsch,et al.  IMPROVED THERMAL STABILITY OF NONPOLYMERIC ORGANIC GLASSES BY DOPING WITH FULLERENE C60 , 1999 .

[13]  Zhenan Bao,et al.  New Air-Stable n-Channel Organic Thin Film Transistors , 1998 .