White top-emitting organic light-emitting diodes employing tandem structure

A high-efficiency white top-emitting organic light-emitting diode (TOLED) is demonstrated by introducing tandem structure. The microcavity effects are used to finalize the configuration of the tandem white TOLED. The resultant tandem white TOLED emits a complementary-color white light with the Commission Internationale de L'Eclairage coordinates of (0.39, 0.43) and the color-rendering index of 70, which retains high color stability towards driving voltage. The maximum forward viewing external quantum efficiency and current efficiency of the device are 16.9% and 41.1 cd/A, respectively. The employment of the tandem structure can be an alternative method to fabricate white TOLEDs for practical applications.

[1]  Yong-hua Chen,et al.  Organic semiconductor heterojunction as charge generation layer in tandem organic light-emitting diodes for high power efficiency , 2012 .

[2]  Yong-hua Chen,et al.  Highly efficient tandem white organic light-emitting diodes based upon C60/NaT4 organic heterojunction as charge generation layer , 2012 .

[3]  J. Qin,et al.  High‐Performance, Phosphorescent, Top‐Emitting Organic Light‐Emitting Diodes with p–i–n Homojunctions , 2011 .

[4]  Ping Chen,et al.  Highly efficient top-emitting white organic light-emitting diodes with improved contrast and reduced angular dependence for active matrix displays , 2010 .

[5]  Wai-Yeung Wong,et al.  Recent progress and current challenges in phosphorescent white organic light-emitting diodes (WOLEDs) , 2010 .

[6]  Dongge Ma,et al.  Management of charges and excitons for high-performance white organic light-emitting diodes. , 2010, Chemical Society reviews.

[7]  Dongge Ma,et al.  Realization of blue, green, and white inverted microcavity top-emitting organic light-emitting devices based on the same emitting layer. , 2010, Optics letters.

[8]  Dongge Ma,et al.  Highly efficient inverted top-emitting organic light-emitting diodes using a lead monoxide electron injection layer. , 2009, Optics express.

[9]  Dongge Ma,et al.  Highly efficient single-emitting-layer white organic light-emitting diodes with reduced efficiency roll-off , 2009 .

[10]  K. Leo,et al.  Optimized efficiency and angular emission characteristics of white top-emitting organic electroluminescent diodes , 2009 .

[11]  Mei-Rurng Tseng,et al.  Efficient, long-life and Lambertian source of top-emitting white OLEDs using low-reflectivity molybdenum anode and co-doping technology , 2008 .

[12]  G. Yeom,et al.  White top-emitting organic light-emitting diodes using one-emissive layer of the DCJTB doped DPVBi layer , 2008 .

[13]  Xingyuan Liu,et al.  Phase shift and penetration depth of metal mirrors in a microcavity structure. , 2007, Applied optics.

[14]  M. Wong,et al.  High-Performance Top-Emitting White Organic Light-Emitting Devices , 2007 .

[15]  Shih-Feng Hsu,et al.  Highly efficient top-emitting white organic electroluminescent devices , 2005 .

[16]  Stephen R. Forrest,et al.  White Organic Light‐Emitting Devices for Solid‐State Lighting , 2004 .

[17]  Yuh-Sheng Wen,et al.  Highly Phosphorescent Bis-Cyclometalated Iridium Complexes Containing Benzoimidazole-Based Ligands , 2004 .

[18]  Ching Wan Tang,et al.  High-efficiency tandem organic light-emitting diodes , 2004 .

[19]  D Murphy,et al.  Highly phosphorescent bis-cyclometalated iridium complexes: synthesis, photophysical characterization, and use in organic light emitting diodes. , 2001, Journal of the American Chemical Society.