Polymeric white organic light-emitting diodes with two emission layers

Sungkoo Lee, Yirang Im, Kyeong K. Lee, Eunhee Lim

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


A white light-emitting diode was fabricated by preparing multilayer emitting films with an inserted buffer layer. The device structures are ITO/PEDOT:PSS/Emissive layer/LiF/Al. The emissive layer comprises a yellow-emitting layer of Poly[9,9-dioctylfluorenyl-2,7-diyl]-co-1,4-benzo-(2,1, 3)-thiadiazole (F8BT), a blue-emitting layer of Poly[9,9-di-(2′- ethylhexyl)fluorenyl-2,7-diyl] (BEHF) and PEDOT:PSS as a buffer layer between the emission layers. The solution processed multi-layer polymer light-emitting diodes (PLED) were prepared by introduction of a water-soluble buffer layer between organic solvent soluble layers. We present white organic light-emitting diodes (WOLEDs) that has bilayer emission zones. This device exhibits a brightness of 280 cd/m 2 and emission efficiency of 1.18 cd/A at 12.6 V. The device with a doped PEDOT:PSS layer and a thicker blueemission layer exhibits CIE color coordinates of (0.30, 0.34), which is close to the white coordinates of (0.33, 0.33) used by the standard CIE color coordinates.

Original languageEnglish
Pages (from-to)3688-3691
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Issue number4
StatePublished - 2012


  • Multilayer
  • Polymer
  • White light-emitting diode


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