Acta Optica Sinica, Volume. 27, Issue 8, 1519(2007)
Linear and Nonlinear Optical Properties of Two PPV Derivatives
The effect of side chains with different length on the optical properties of two PPV derivatives, poly (2,5-dioctyloxy-1,4-phenylenevinylene) and poly(2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylenevinylene), was investigated by absorption spectroscopy, fluorescence spectroscopy and picosecond Z-scan technique. The optical properties of two derivatives were discussed using the theories of π-electron conjugated structure and resonant/non-resonant enhancement, respectively. The obtained results demonstrated that the absorption and fluorescence emission bands of MEH-PPV shift towards the long wavelength direction compared with the counterparts of DO-PPV. Furthermore, the side chains also affect the third-order nonlinear susceptibilities χ(3) of PPV polymers. Under the resonant excitation, the third-order nonlinear susceptibility χ(3) of MEH-PPV at 532 nm is two orders of magnitude larger than that of DO-PPV, and reached a maximum of 9.30×1010 esu.
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[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese]. Linear and Nonlinear Optical Properties of Two PPV Derivatives[J]. Acta Optica Sinica, 2007, 27(8): 1519