Microcavity top-emitting organic light-emitting devices integrated with diffusers for simultaneous enhancement of efficiencies and viewing characteristics

We show that integrating diffuser films with microcavity top-emitting organic light-emitting devices (OLEDs) provide a convenient approach for simultaneously achieving large quantum- efficiency enhancement (1.38 times compared to top-emitting devices without diffusers and 2.1 times compared to conventional bottom-emitting devices) and improving viewing characteristics (more saturated/stable colors over angles, emission patterns more Lambertian, pixel sharpness remained) of top-emitting microcavity OLEDs for display applications. Most importantly, the fabrication of the diffuser films is simple and effective. These features may make it attractive for use in enhancing OLED performances in various applications.

[1]  Chih-Jen Yang,et al.  Microcavity top-emitting organic light-emitting devices integrated with microlens arrays: Simultaneous enhancement of quantum efficiency, cd/A efficiency, color performances, and image resolution , 2007 .

[2]  T. Mizutani,et al.  Encapsulation of organic light-emitting diode using thermal chemical-vapour-deposition polymer film , 2001 .

[3]  Chunliang Lin,et al.  Influences of resonant wavelengths on performances of microcavity organic light-emitting devices , 2007 .

[4]  Chung-Chih Wu,et al.  Enhancing light outcoupling of organic light-emitting devices by locating emitters around the second antinode of the reflective metal electrode , 2006 .

[5]  Chieh-Wei Chen,et al.  Top-emitting organic light-emitting devices using surface-modified Ag anode , 2003 .

[6]  Xiang Zhou,et al.  Very-low-operating-voltage organic light-emitting diodes using a p-doped amorphous hole injection layer , 2001 .

[7]  Heike Riel,et al.  Phosphorescent top-emitting organic light-emitting devices with improved light outcoupling , 2003 .

[8]  Chunliang Lin,et al.  Methodology for optimizing viewing characteristics of top-emitting organic light-emitting devices , 2004 .

[9]  Stephen R. Forrest,et al.  Improved light out-coupling in organic light emitting diodes employing ordered microlens arrays , 2002 .

[10]  Tetsuo Tsutsui,et al.  Control of emission characteristics in organic thin‐film electroluminescent diodes using an optical‐microcavity structure , 1993 .

[11]  Martin Pfeiffer,et al.  Highly efficient top emitting organic light-emitting diodes with organic outcoupling enhancement layers , 2006 .

[12]  C. Tang,et al.  Application of an ultrathin LiF/Al bilayer in organic surface-emitting diodes , 2001 .

[13]  Stephen R. Forrest,et al.  Organic light emitting devices with enhanced outcoupling via microlenses fabricated by imprint lithography , 2006 .

[14]  Chung-Chih Wu,et al.  Examining microcavity organic light-emitting devices having two metal mirrors , 2005 .

[15]  Ananth Dodabalapur,et al.  Efficiency enhancement of microcavity organic light emitting diodes , 1996 .