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Proceedings Paper

Blue polarized luminescence from organic material aligned by ion-beam-processed poly(3,4-ethylenedioxythiophene)
Author(s): Wei-Yang Chou; Shih-Tin Ling; 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
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Paper 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.

Paper Details

Date Published: 18 August 2005
PDF: 9 pages
Proc. SPIE 5888, Polarization Science and Remote Sensing II, 58881C (18 August 2005); doi: 10.1117/12.614657
Show Author Affiliations
Wei-Yang Chou, National Cheng Kung Univ. (Taiwan)
Shih-Tin Ling, National Cheng Kung Univ. (Taiwan)
Horng-Long Cheng, National Cheng Kung Univ. (Taiwan)
Fu-Ching Tang, National Cheng Kung Univ. (Taiwan)
Kai-Yun Chang, National Cheng Kung Univ. (Taiwan)
S. K. Hsu, National Cheng Kung Univ. (Taiwan)
Yu-Shen Mai, National Cheng Kung Univ. (Taiwan)
Chia-Wei Kuo, National Cheng Kung Univ. (Taiwan)
Chia-Rong Sheu, National Cheng Kung Univ. (Taiwan)
Chi-Chang Liao, Industrial Technology Research Institute (Taiwan)
Ten-Chin Wen, National Cheng Kung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 5888:
Polarization Science and Remote Sensing II
Joseph A. Shaw; J. Scott Tyo, Editor(s)

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