Concentration dependence of photoluminescence properties in poly[(2-methoxy,5-octoxy)1,4-phenylenevinylene] thin films |
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Authors: | LG Yang QH Zhang TC Huang PF Gu |
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Institution: | a Department of Optical Engineering, Zhejiang University, Yu-Quan, Hangzhou 310027, PR China b Department of Polymer Science and Engineering, Zhejiang University, Yu-Quan, Hangzhou 310027, PR China |
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Abstract: | Photoluminescence and selective excitation photoluminescence measurements at room temperature have been performed on poly(2-methoxy,5-octoxy) 1,4-phenylenevinylene] (MO-PPV) thin films, which are prepared from MO-PPV chloroform solutions of different concentrations. The position of the S0→S1 absorption peak shows red-shift and broadened relative to that in an MO-PPV solution form due to the solidification effect, while no relative shifts between the absorption spectra of these film samples are observed. A long wavelength emission component near 630 nm has been identified as S2→S0 vibronic transition through the Gaussian decomposition method and confirmed by below-gap PL and selective-excitation PL experiments. This second vibronic component cannot be observed in the spectra of thick films. The PL efficiency of MO-PPV thin film is also investigated through comparison with that of an MEH-PPV thin film and explained by the side substituent effect. |
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Keywords: | 78 55 Kz 78 40 Me 78 66 Qn 36 20 Fz 71 35 Cc |
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