Intrinsic electrochemical doping in blue light emitting polymer devices utilizing a water soluble anionic conjugated polymer
Intrinsic electrochemical doping in blue light emitting polymer devices utilizing a water soluble anionic conjugated polymer
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利用水溶性阴离子共轭聚合物的蓝光发射聚合物器件中的本征电化学掺杂
DOI：
10.1016/j.orgel.2007.07.001
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发表时间：
2007
影响因子：
3.2
通讯作者：
E. List
中科院分区：
文献类型：
--
作者：
S. Sax;S. Sax;G. Mauthner;G. Mauthner;T. Piok;T. Piok;S. Pradhan;U. Scherf;E. List;E. List
报道了具有烷基磺酸钠侧链的水溶性蓝光阴离子聚{1,4-苯基-[9,9-双（4-苯氧基丁基磺酸盐）]芴-2,7-二基}共聚物（PBS-PFP）的发光器件相关性质。与有机溶剂相比，水具有环保的优势，通过喷墨打印等新型制备技术简化了设备制造过程中的处理。由该聚合物制成的薄膜发光器件显示出稳定的蓝色发射，发射最大值约为420nm。关于电流密度/电压和亮度/电压器件特性的研究，以及恒定偏置下的电流密度随操作时间的变化，可以识别由附着在聚合物侧链上的离子基团引起的内在电化学掺杂效应。因此，首先，使用具有空气稳定性的铝等高功函数电极的电子注入器件的电致发光起始电压可以明显降低，其次，由该聚合物制成的器件在正向偏置方向和反向偏置方向上都显示出亮度。
We report on light emitting device related properties of the water soluble blue light emitting anionic poly{1,4-phenylene-[9,9-bis(4-phenoxy-butylsulfonate)]fluorene-2,7-diyl} copolymer (PBS-PFP) with alkyl sulfonic acid sodium side chains. Compared to organic solvents water has the advantage of being environmentally friendly, which simplifies the handling during device fabrication by novel preparation techniques such as ink-jet printing. Light emitting devices fabricated from this polymer in thin film configuration show stable blue emission with an emission maximum at approximately 420nm. Investigations concerning the current–density/voltage and the luminance/voltage device characteristics as well as the current–density over operation time at constant biases allow the identification of intrinsic electrochemical doping effects caused by ionic groups attached on the side chains of the polymer. Due to this fact, firstly the electroluminescence onset voltage for devices using high work-function electrodes for electron injection such as aluminum, which has the advantage of being air stable, can be distinctly reduced, and secondly devices fabricated from this polymer showed luminance in forward bias direction as well as in reverse bias direction.