Improve efficiency of white organic light-emitting diodes by using nanosphere arrays in color conversion layers

Yu-Hsuan Ho, Ding-Wei Huang, Yung-Ting Chang, Ya-Han Ye, Chih-Wei Chu, Wei-Cheng Tian, Chin-Ti Chen, Pei-Kuen Wei
2012 Optics Express  
The authors demonstrated an efficient color conversion layer (CCL) by using nanosphere arrays in down-converted white organic light-emitting diodes (WOLEDs). The introduced periodical nanospheres not only helped extract the confined light in devices, but also increased the effective light path to achieve high-efficiency color conversion. By applying a CCL with red phosphor on a 400-nm-period nanosphere array, we achieved 137% color conversion ratio for blue OLEDs, which was 2.68 times higher
more » ... n conventional flat CCL. The resulting luminous efficiency of WOLEDs with patterned CCLs (20.97 cd/A, 1000 cd/m2) was two times higher than the efficiency of the flat device (10.26 cd/A, 1000 cd/m2).
doi:10.1364/oe.20.003005 pmid:22330538 fatcat:asnhjd2m4bbtfdjnthxpyzsary