Co-host comprising hole-transporting and blue-emitting components for efficient fluorescent white OLEDs

Yu Cheng Chen, Po Ching Kao, Jen Chou Yu, Yung Der Juang, Sheng-Yuan Chu

Research output: Contribution to journalArticle

Abstract

Efficient co-host emission layer has been demonstrated by mixing blue-emitting p-DMDPVBi and hole-transporting NPB in optimal weight ratio (w/w = 80/20). First, efficiency enhancement was observed in the fabrication of blue organic light-emitting diodes (ITO/NPB/p-DMDPVBi:NPB/TPBi/LiF/Al). Then, bright, efficient and stable fluorescent white organic light-emitting diodes were obtained by doping the optimal co-host emissive layer with orange dye (rubrene). The device performance was significantly improved, with a turn-on voltage, maximum luminance and maximum current efficiency of 2.9 V, 18100 cd/m 2 and 10.6 cd/A, respectively. The improvement mechanisms were elucidated using energy level diagrams, photoluminescence spectra, absorption spectra, and electroluminescence spectra. Current results show that forming the co-host emission layer is a promising way to improve device performance, making it applicable for facile fabrication of efficient OLEDs.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume159
Issue number4
DOIs
Publication statusPublished - 2012 Feb 29

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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