High-efficiency small-molecule-based organic light emitting devices with solution processes and oxadiazole-based electron transport materials

Yung Ting Chang, Jan Kai Chang, Yi Ting Lee, Po Sheng Wang, Jhao Lin Wu, Che Chang Hsu, I. Wen Wu, Wei Hsuan Tseng, Tun Wen Pi, Chin Ti Chen, Chih I. Wu

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

We demonstrate high-efficiency small-molecule-based white phosphorescent organic light emitting diodes (PHOLEDs) by single-active-layer solution-based processes with the current efficiency of 17.3 cdA-1 and maximum luminous efficiency of 8.86 lmW-1 at a current density of 1 mA cm-2. The small-molecule based emitting layers are codoped with blue and orange phosphorescent dyes. We show that the presence of CsF/Al at cathodes not only improves electron transport in oxadiazole-containing electron transport layers (ETLs), but also facilitates electron injection through the reacted oxadiazole moiety to reduce interface resistance, which results in the enhancement of current efficiency. By selecting oxadiazole-based materials as ETLs with proper electron injection layer (EIL)/cathode structures, the brightness and efficiency of white PHOLEDs are significantly improved.

Original languageEnglish
Pages (from-to)10614-10622
Number of pages9
JournalACS Applied Materials and Interfaces
Volume5
Issue number21
DOIs
Publication statusPublished - Nov 13 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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