Department of Physics
RGB recombination zone tuning to improve optical characteristics of white organic light-emitting diodes
Copyright © 2015 American Scientific Publishers.White organic light emitting diodes (WOLEDs) were fabricated using blue, green and red emitting layers (EMLs). The device has a structure of ITO/NPB/EML/Alq3 / Liq/Al. Here, to control the white color balance, the location of the blue EML in the WOLEDs was fixed and only the thickness of blue EML was changed while both thickness and position of the green and red EMLs were adjusted. When adjusting the thickness of blue EML, the occurrence area of recombination zone was changed to influence the green luminescence. When adjusting the location and thickness of red EML, it could be found that the current density is more sensitive to the location of red EML than its thickness. Furthermore, it was discovered that light was emitted due to the Förster energy transfer even if it was apart from the recombination zone. WOLEDs with a maximum luminance of 17,740 cd/m, 2 an external quantum efficiency of 2.12% at 100 cd/m, 2 CIE coordinates of (0.328 , 0.301) and a color temperature of 6,185 K were obtained.
Förster energy transfer, Recombination zone, Thickness., Three primary colors, WOLED
Source Publication Title
Journal of Nanoscience and Nanotechnology
American Scientific Publishers
Link to Publisher's Edition
Song, Wook, Mei Meng, Kok Wai Cheah, Fu Rong Zhu, and Woo Young Kim. "RGB recombination zone tuning to improve optical characteristics of white organic light-emitting diodes." Journal of Nanoscience and Nanotechnology 15.5 (2015): 3697-3702.