Highly efficient phosphor-converted white organic light-emitting diodes with moderate microcavity and light-recycling filters.

We demonstrate the combined effects of a microcavity structure and light-recycling filters (LRFs) on the forward electrical efficiency of phosphor-converted white organic light-emitting diodes (pc-WOLEDs). The introduction of a single pair of low- and high-index layers (SiO(2)/TiO(2)) improves the blue emission from blue OLED and the insertion of blue-passing and yellow-reflecting LRFs enhances the forward yellow emission from the YAG:Ce(3+) phosphors layers. The enhancement of the luminous efficacy of the forward white emission is 1.92 times that of a conventional pc-WOLED with color coordinates of (0.34, 0.34) and a correlated color temperature of about 4800 K.

[1]  C. H. Chen,et al.  Electroluminescence of doped organic thin films , 1989 .

[2]  Joseph John Shiang,et al.  Organic light-emitting devices for illumination quality white light , 2002 .

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

[4]  Yong-Hee Lee,et al.  Enhanced forward efficiency of Y3Al5O12:Ce3+ phosphor from white light-emitting diodes using blue-pass yellow-reflection filter. , 2009, Optics express.

[5]  S. R. Forrest,et al.  High-efficiency fluorescent organic light-emitting devices using a phosphorescent sensitizer , 2000, Nature.

[6]  Sun Young Lee,et al.  Weak-microcavity organic light-emitting diodes with improved light out-coupling. , 2008, Optics express.

[7]  Yoon-Ho Song,et al.  Efficient white organic light emission by single emitting layer , 2003 .

[8]  Benjamin Claus Krummacher,et al.  Highly efficient white organic light-emitting diode , 2006 .

[9]  S. Forrest,et al.  A Full‐Color Transparent Metal‐Free Stacked Organic Light Emitting Device with Simplified Pixel Biasing , 1999 .

[10]  Yuguang Ma,et al.  Exceedingly efficient deep-blue electroluminescence from new anthracenes obtained using rational molecular design , 2008 .

[11]  P. Baumeister,et al.  Multilayer mirrors with high reflectance over an extended spectral region. , 1966, Applied optics.

[12]  N. Narendran,et al.  Extracting phosphor‐scattered photons to improve white LED efficiency , 2005 .

[13]  Modeeparampil N. Kamalasanan,et al.  White organic LEDs and their recent advancements , 2006 .

[14]  Jenn‐Fang Chen,et al.  Highly efficient white organic electroluminescent devices based on tandem architecture , 2005 .

[15]  Tetsuo Tsutsui,et al.  Organic electroluminescent device having a hole conductor as an emitting layer , 1989 .

[16]  Jeong Rok Oh,et al.  Deep blue, efficient, moderate microcavity organic light-emitting diodes , 2010 .