Document Type
Journal Article
Department/Unit
Department of Physics
Title
RGB recombination zone tuning to improve optical characteristics of white organic light-emitting diodes
Language
English
Abstract
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.
Keywords
Förster energy transfer, Recombination zone, Thickness., Three primary colors, WOLED
Publication Date
2015
Source Publication Title
Journal of Nanoscience and Nanotechnology
Volume
15
Issue
5
Start Page
3697
End Page
3702
Publisher
American Scientific Publishers
DOI
10.1166/jnn.2015.9260
Link to Publisher's Edition
http://dx.doi.org/10.1166/jnn.2015.9260
ISSN (print)
15334880
ISSN (electronic)
15334899
APA Citation
Song, W., Meng, M., Cheah, K., Zhu, F., & Kim, W. (2015). RGB recombination zone tuning to improve optical characteristics of white organic light-emitting diodes. Journal of Nanoscience and Nanotechnology, 15 (5), 3697-3702. https://doi.org/10.1166/jnn.2015.9260