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

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