Blue polarized luminescence from organic material aligned by ion-beam-processed poly(3,4-ethylenedioxythiophene)

Wei Yang Chou, Shih Ting Lin, Horng Long Cheng, Fu Ching Tang, Kai Yun Chang, S. K. Hsu, Yu Shen Mai, Chia Wei Kuo, Chia Rong Sheu, Chi Chang Liao, Ten Chin Wen

Research output: Contribution to journalConference articlepeer-review

Abstract

We first demonstrated that an organic electroluminescence (EL) device based on conjugated polymers, which emitted polarized light, aligned by ion beam processed films of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). Such devices would be particularly useful as backlights for conventional LCDs. Homogenous alignment of 4,4′-Bis[2-9(-ethyl-3- carbazoyl)vinylenyl]-1,1′-biphenyl (BECVB) films on thin layers of ion-beam-processed or rubbed PEDOT:PSS allows the construction of light-emitting diodes that emit polarized blue light (λem = 455 nm). The ion-beam-processed or rubbed PEDOT:PSS acts as an effective hole-injecting alignment layer. Polarized photoluminescence spectra demonstrated that the long axis of BECVB molecule was oriented along the ion-beam or rubbing direction. Owing to the orientation of BECVB molecules, polarized EL in the rubbing or ion-beam direction was observed in the device. The maximum photoluminescence polarization ratios of 5.6:1 and 3.2:1 were achieved for the devices aligned by rubbing and ion-beam methods, respectively.

Original languageEnglish
Article number58881C
Pages (from-to)1-9
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5888
DOIs
Publication statusPublished - 2005 Dec 29
EventPolarization Science and Remote Sensing II - San Diego, CA, United States
Duration: 2005 Aug 22005 Aug 4

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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