Absorption and Quantum Yield of Single Conjugated Polymer Poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) Molecules

Summary, in English

We simultaneously measured the absorption and emission of single conjugated polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) molecules in a poly(methyl methacrylate) (PMMA) matrix using near-critical xenon to enhance the photothermal contrast for direct absorption measurements. We directly measured the number of monomers and the quantum yield of single conjugated polymer molecules. Simultaneous absorption and emission measurements provided new insight into the photophysics of single conjugated polymers under optical excitation: quenching in larger molecules is more efficient than in smaller ones. Photoinduced traps and defects formed under prolonged illumination lead to decrease of both polymer fluorescence and absorption signals with the latter declining slower.

• Author: Lei Hou; Subhasis Adhikari; Yuxi Tian; Ivan G. Scheblykin; Michel Orrit
• Department/s: Chemical Physics; NanoLund: Centre for Nanoscience
• Publishing year: 2017-03-08
• Language: English
• Pages: 1575-1581
• Publication/Series: Nano Letters
• Volume: 17
• Issue: 3
• Links: http://dx.doi.org/10.1021/acs.nanolett.6b04726
• Document type: Journal article
• Publisher: The American Chemical Society (ACS)
• Topic: Polymer Chemistry; Atom and Molecular Physics and Optics
• Keywords: absorption; Conjugated polymer; photothermal; quantum yield; quenching
• Status: Published
• ISBN/ISSN/Other: ISSN: 1530-6984