Solution-processed white organic light-emitting diodes with mixed-host structures

Xinwen Zhang, Zhaoxin Wu, Bo Jiao, Dongdong Wang, Dawei Wang, Xun Hou, Wei Huang

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Efficient white light-emitting diodes (WOLEDs) were fabricated with a solution-processed single emission layer composed of a molecular and polymeric material mixed-host (MH). The main host used was a blue-emitting molecular material of 4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl (DPVBi) and the assisting host used was a hole-transport-type polymer of poly(9-vinylcarbazole) (PVK). By co-doping 4,4′-bis[2-(4-(N,N- diphenylamino)phenyl)vinyl]biphenyl and 5,6,11,12-tetraphenylnaphacene into the MH, the performances of the fabricated devices made with different mixing ratio of host materials were investigated, and were to depend on the mixing ratios. Under the optimal PVK:DPVBi ratio (3:7), we achieved a maximum luminance of 14 110 cd/m 2 and a maximum current efficiency of 9.5 cd/A. These improvements were attributed to the MH structure, which effectively improved the thermal stability of spin-coated film and enhanced the hole-injection/ transporting properties of WOLEDs.

Original languageEnglish
Pages (from-to)697-701
Number of pages5
JournalJournal of Luminescence
Volume132
Issue number3
DOIs
StatePublished - Mar 2012
Externally publishedYes

Keywords

  • Mixed-host
  • Solution process
  • White organic light-emitting diodes

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