標題: Synthesis of laterally attached side-chain liquid crystalline poly(p-phenylene vinylene) and polyfluorene derivatives for the application of polarized electroluminescence
作者: Yao, Yung-Hsin
Yang, Sheng-Hsiung
Hsu, Chain-Shu
應用化學系
Department of Applied Chemistry
關鍵字: poly(p-phenylene vinylene);polyfluorene;polarized light
公開日期: 22-Nov-2006
摘要: Two series of poly(p-phenylene vinylene) and polyfluorene derivatives (PPV1-PPV4 and PF1-PF5) containing laterally attached penta(p-phenylene) mesogenes were synthesized and characterized. These polymers show nematic liquid crystalline behavior. The optical properties of the polymers were investigated by UV-vis absorption and photoluminescence spectrometers and these polymers were fabricated to form the polarized electroluminescent devices using poly(ethylenedioxythiophene)-poly(styrene sulfonic acid) (PEDOT-PSS) as an alignment layer. In the series of poly(p-phenylene vinylene) derivatives, polymer PPV4 offered the best EL device performance. It emitted yellow light at 588 nm at 4 V The maximum brightness was about 1337 cd/m(2) at 9 V with a polarized ratio of 2.6. In another series of polyfluorene derivatives, PF4 offered the best EL device performance with the polarized ratio of 12.4 and a maximum luminescence of 1855 cd/m(2). In the case of polarized white light, as a consequence of blending small amount of PF4 and PF5 with a host polymer PF2, polarized ratio of up to 10.2 and a maximum brightness of 2454 cd/m(2) have been attained. The aligned films exhibited pronounced polarized ratio, implying that the polymers exhibit potential for linearly polarized LED application. (c) 2006 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.polymer.2006.10.002
http://hdl.handle.net/11536/11530
ISSN: 0032-3861
DOI: 10.1016/j.polymer.2006.10.002
期刊: POLYMER
Volume: 47
Issue: 25
起始頁: 8297
結束頁: 8308
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