12 January 2005 Annealing and concentration effects on the photoluminescence and absorption of optically-thin conjugated polymer films and photonic wells
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Abstract
Soluble poly(phenylene vinylene)(PPV)-type polymers have been applied widely as active layers in many optoelectronic devices, such as light-emitting diodes and organic lasers. In such devices their physical thickness are commonly about 100~200 nanometers for the desirable charge transport characteristics and optical interference effects. In this work, poly[(2-methoxy,5-octoxy) 1,4-phenylenevinylene] (MO-PPV) thin films have been prepared from their chloroform solutions of different concentrations. Then their UV-VIS absorption (Abs), photoluminescence (PL) and selective-excitation photoluminescence (SEPL) spectra have been measured at room temperature. A long wavelength emission component near 630 nm has been identified as S2→S0 vibronic band through gaussian decomposition method and confirmed by experiments. The effect of annealing on the optical properties of MO-PPV thin films is also studied. The results show that there exists an optimal treatment temperature under which the maximal excitation intensity can arrive. It can be attributed to the different morphologies in films. In addition, an experimental research about the active polymer photonic well structures of MO-PPV/PMMA pairs has been carried out.
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Ligong Yang, Ligong Yang, Peifu F. Gu, Peifu F. Gu, Hui Ye, Hui Ye, Peng Wu, Peng Wu, } "Annealing and concentration effects on the photoluminescence and absorption of optically-thin conjugated polymer films and photonic wells", Proc. SPIE 5632, Light-Emitting Diode Materials and Devices, (12 January 2005); doi: 10.1117/12.570323; https://doi.org/10.1117/12.570323
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