Electrostatic self-assembly and characterization of poly(p-phenylene vinylene)/CdS nanocomposite films

Haihu Yu; Desheng Jiang; Enyu Yang; Honghui Li; Xiaoyao Chen; Lingde Zhou

doi:10.1117/12.574533

12 January 2005 Electrostatic self-assembly and characterization of poly(p-phenylene vinylene)/CdS nanocomposite films

Haihu Yu, Desheng Jiang, Enyu Yang, Honghui Li, Xiaoyao Chen, Lingde Zhou

Proceedings Volume 5632, Light-Emitting Diode Materials and Devices; (2005) https://doi.org/10.1117/12.574533
Event: Photonics Asia, 2004, Beijing, China

Abstract

Colloidal CdS stabilized with (NaPO₃)₆ was prepared from Cd(NO₃)₂ and Na₂S. The precursor of poly(p-phenylene vinylene), PPV, was synthesized through Wessling's route. PPV precursor/CdS multilayer films were fabricated via the layer-by-layer electrostatic self-assembly technique. After thermal treating the PPV precursor/CdS films, PPV/CdS nanocomposite films were formed. The colloidal CdS and the composite films were characterized using a UV-vis spectrophotometer and a fluorescence spectrophotometer. A photoluminescence peak of the PPV/CdS multilayer film appears at around 380 nm, suggesting that the photoluminescence of the composite films should attribute to the CdS nanoparticles. The electroluminescence spectra show that a strong luminescence band appears in range 350~650 nm, centering around 530 nm, suggesting that the electroluminescence of the composite films should mainly attribute to PPV. For the ITO/(PPV/CdS)₂₀/Al device, the threshold voltage was about 5 V, and the luminescence intensities increased as the biased voltages increased. In the PPV/CdS nanocomposite film-based light emitting device, CdS plays a role mainly in electron-transporting and PPV works mainly in electroluminescence. However, at higher voltages, CdS nanoparticles may also emit light.

Citation Download Citation

Haihu Yu, Desheng Jiang, Enyu Yang, Honghui Li, Xiaoyao Chen, and Lingde Zhou "Electrostatic self-assembly and characterization of poly(p-phenylene vinylene)/CdS nanocomposite films", Proc. SPIE 5632, Light-Emitting Diode Materials and Devices, (12 January 2005); https://doi.org/10.1117/12.574533

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