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

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

doi:10.1117/12.614657

18 August 2005 Blue polarized luminescence from organic material aligned by ion-beam-processed poly(3,4-ethylenedioxythiophene)

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

Author Affiliations +

Proceedings Volume 5888, Polarization Science and Remote Sensing II; 58881C (2005) https://doi.org/10.1117/12.614657
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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 (λ_em = 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.

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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, and Ten-Chin Wen "Blue polarized luminescence from organic material aligned by ion-beam-processed poly(3,4-ethylenedioxythiophene)", Proc. SPIE 5888, Polarization Science and Remote Sensing II, 58881C (18 August 2005); https://doi.org/10.1117/12.614657

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