Light emission in phase separated conjugated and non-conjugated polymer blends

• Published in: Polymer (Guilford) Vol. 46; no. 13; pp. 4967 - 4970
• Main Authors: Chou, Hsieh-Li, Hsu, Shen-Yi, Wei, Pei-Kuen
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 17.06.2005; Elsevier
• Subjects: Applied sciences; Electrical, magnetic and optical properties; Exact sciences and technology; Light emission; Organic polymers; Physicochemistry of polymers; Polymer blends; Polymer light emitting diodes; Properties and characterization; Polymer light emitting diodes; Polymer blends; Light emission; Chemical solution; Property composition relationship; Dispersion degree; Photoluminescence; Methyl methacrylate polymer; Phenylenevinylene derivative polymer; Experimental study; Heterogeneous mixture; Solid state; Conjugated polymer; Optical properties; Morphology
• ISSN: 0032-3861; 1873-2291
• DOI: 10.1016/j.polymer.2005.03.092

Phase separations in conjugated polymer (MEH-PPV) and non-conjugated polymer (PMMA) blended films are studied by photoluminescent (PL) near-field scanning optical microscope and spectrometer. The morphologies of blended films changed from stripe patterns to isolated islands as PMMA concentrations increased. The PL spectra in isolated micron dots are the same as MEH-PPV. Nevertheless, we found new PL spectra, peaked at 500 nm wavelength, in the PMMA matrix. Since, PMMA does not emit light, the new spectra indicate some MEH-PPV diluted in the PMMA rich regions. The excitons of MEH-PPV in the PMMA matrix are localized and emit light as PPV oligomers.