Photoreactive main chain conjugated polymer containing oxetane moieties in the side chain and its application to green electrophosphorescence devices

Min Ju Cho, Jicheol Shin, Jung Il Jin, Young Min Kim, Young Wook Park, Byeong Kwon Ju, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The utilization of a photoreactive hole injection/transport layer in multilayer electrophosphorescence polymer light-emitting diodes (PLEDs) is demonstrated in this study. A new photoreactive polymer was synthesized using 3,6-dibromo-9-(6-((3-methyloxetan-3-yl)methoxy)hexyl)-9H-carbazole and 2,4-dimethyl-N,N-bis(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)aniline via the Suzuki coupling reaction. When oxetane groups were photopolymerized in the presence of a cationic photoinitiator, the cured film showed good compatibility with PEDOT:PSS and the indium tin oxide (ITO) layer due to the hydrophilic nature of the cross-linked section. The resulting green light-emitting device bearing PVK:PBD:Ir(Cz-ppy)3 exhibits a maximum external quantum efficiency of 8.73%, corresponding to a luminous efficiency of 28.2 cd/A when using the device configuration of ITO/POx-TPACz/PEDOT:PSS/PVK:PBD:Ir(Cz-ppy)3/TAZ/Alq3/LiF/Al. These values are higher than those of PLEDs using conventional PEDOT:PSS as a single hole injection layer (HIL). The slight degree of improvement in device efficiency is due to the reduced hole injection barrier.

Original languageEnglish
Pages (from-to)2147-2152
Number of pages6
JournalSynthetic Metals
Volume159
Issue number19-20
DOIs
Publication statusPublished - 2009 Oct

Keywords

  • Electrophosphorescence
  • Energy transfer
  • Iridium(III) complex
  • Oxetane
  • Photocross-link
  • Photoluminescence
  • Solubility

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Photoreactive main chain conjugated polymer containing oxetane moieties in the side chain and its application to green electrophosphorescence devices'. Together they form a unique fingerprint.

Cite this