RGB recombination zone tuning to improve optical characteristics of white organic light-emitting diodes

Wook Song, Mei Meng, Kok Wai CHEAH, Fu Rong ZHU, Woo Young Kim*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)3697-3702
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Volume15
Issue number5
DOIs
Publication statusPublished - 1 May 2015

User-Defined Keywords

  • Förster energy transfer
  • Recombination zone
  • Thickness.
  • Three primary colors
  • WOLED

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