Poly(3,4-ethylene dioxythiophene): Poly(styrene sulfonate)的共振拉曼光谱研究

通过拉曼光谱方法分别对PEDOT:PSS掺杂和去掺杂状态进行了详细分析. 实验结果表明, 去掺杂的PEDOT:PSS由于其在激发波长附近的吸收增强而引起了共振效应, 拉曼信号得到大幅度增强, 可见, 以633 nm(He-Ne)激光为激发波长的拉曼光谱是研究PEDOT:PSS掺杂状态的有效方法. 此外, 显微拉曼光谱也是分析聚合物发光二极管器件内各层材料的有效手段.

Study of Poly (3,4-Ethylene Dioxythiophene):Poly (Styrene Sulfonate) by In-Situ Resonance Raman Spectroscopy

Poly(3,4-ethylene dioxythiophene)(PEDOT): Poly(styrene sulfonate)(PSS) has attracted a lot of interest for(application) in organic electronics due to good stability and high electronic conductivity in its doped state.Indeed,thin layers of(PEDOT: PSS) was regularly used in light emitting diodes(PLEDs) as hole injection and transportation layer.Here,Doping and(dedoping) states of PEDOT:PSS were studied by absorbance spectra and Raman spectra.A new absorption band centered at 620 nm was observed on dedoped PEDOT:PSS.Consistently,Raman signals of dedoped PEDOT:PSS are resonantly intensified since the Raman excitation wavelength (633 nm) is set in the enhanced absorption band.So it gives a sensitive way to study the doping and dedoping states of PEDOT:PSS.Furthermore,for the encapsulated polymer light-emitting diodes,Raman spectroscopy is a powerful way to study the polymer layers inside the devices.