Highly efficient and stable inverted bottom-emission organic light emitting devices

The authors report the development of highly efficient and stable C545T doped green fluorescent Alq3 inverted bottom-emission organic light emitting device (OLED), with a device configuration of ITO∕Mg∕Cs2O:Bphen∕Alq3∕C545T:Alq3∕NPB∕WO3∕Al, that achieved a maximum current efficiency of 23.7cd∕A and a power efficiency of 12.4lm∕W which are two times better than those of the conventional OLED. At a brightness level of 100cd∕m2, the device required driving current density only as low as 0.5mA∕cm2 at a driving voltage of only 5.0V and its half-lifetime T1∕2 in excess of 104000h.

[1]  Wolfgang Kowalsky,et al.  Inverted hybrid organic light-emitting device with polyethylene dioxythiophene-polystyrene sulfonate as an anode buffer layer , 2003 .

[2]  Ho Won Choi,et al.  Enhancement of electron injection in inverted top-emitting organic light-emitting diodes using an insulating magnesium oxide buffer layer , 2005 .

[3]  Igor Bello,et al.  Ion-beam-induced surface damages on tris-(8-hydroxyquinoline) aluminum , 1999 .

[4]  Inverted transparent multi-layered vacuum deposited organic light-emitting diodes with electrically doped carrier transport layers and coumarin doped emissive layer , 2003 .

[5]  M. Wong,et al.  Effective Intermediate Layers for Highly Efficient Stacked Organic Light-Emitting Devices , 2005 .

[6]  H. Chae,et al.  Characteristics of top-emission inverted organic light-emitting diodes with plasma-polymerized para-xylene cathode interfacial layers , 2005 .

[7]  Xiang Zhou,et al.  Low-voltage inverted transparent vacuum deposited organic light-emitting diodes using electrical doping , 2002 .

[8]  Chieh-Wei Chen,et al.  An effective cathode structure for inverted top-emitting organic light-emitting devices , 2004 .

[9]  Y. Zhan,et al.  Mechanisms of injection enhancement in organic light-emitting diodes through insulating buffer , 2004 .

[10]  Fei Huang,et al.  High-efficiency inverted top-emitting polymer light-emitting diodes , 2005 .

[11]  Jingze Li,et al.  Enhanced performance of organic light emitting device by insertion of conducting/insulating WO3 anodic buffer layer , 2005 .

[12]  Ta-Ya Chu,et al.  Ultrathin Electron Injection Layer on Indium–Tin Oxide Bottom Cathode for Highly Efficient Inverted Organic Light-Emitting Diodes , 2006 .

[13]  Joerg Schoebel,et al.  Characterization and optimization of OLED materials and layer sequences , 2001, SPIE Optics + Photonics.

[14]  Eugene Kim,et al.  Inverted top-emitting organic light-emitting diodes using transparent conductive NiO electrode , 2005 .

[15]  Donggeun Jung,et al.  Effects of N2 Plasma Treatment of the Al Bottom Cathode on the Characteristics of Top-Emission-Inverted Organic-Light-Emitting Diodes , 2003 .