18 August 2005 Blue polarized luminescence from organic material aligned by ion-beam-processed poly(3,4-ethylenedioxythiophene)
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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.
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Wei-Yang Chou, Wei-Yang Chou, Shih-Tin Ling, Shih-Tin Ling, Horng-Long Cheng, Horng-Long Cheng, Fu-Ching Tang, Fu-Ching Tang, Kai-Yun Chang, Kai-Yun Chang, S. K. Hsu, S. K. Hsu, Yu-Shen Mai, Yu-Shen Mai, Chia-Wei Kuo, Chia-Wei Kuo, Chia-Rong Sheu, Chia-Rong Sheu, Chi-Chang Liao, Chi-Chang Liao, Ten-Chin Wen, 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); doi: 10.1117/12.614657; https://doi.org/10.1117/12.614657
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