title: [Study of poly (3,4-ethylene dioxythiophene) : poly (styrene sulfonate) by in-situ resonance Raman spectroscopy].
abstract: 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.
authors.affiliation: TEDA Applied Physics School, Nankai University, Tianjin, China.
authors.forename: Hai-bo
authors.initials: HB
authors.lastname: Lin
authors.forename: Xiao-xuan
authors.initials: XX
authors.lastname: Xu
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.forename: Bin-lin
authors.initials: BL
authors.lastname: Wu
authors.forename: Jia-lin
authors.initials: JL
authors.lastname: Xu
authors.forename: Gang
authors.initials: G
authors.lastname: Yu
authors.forename: Cun-zhou
authors.initials: CZ
authors.lastname: Zhang