کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1441567 | 1509437 | 2010 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Photoluminescence of MEH-PPV with ultraviolet excitation Photoluminescence of MEH-PPV with ultraviolet excitation](/preview/png/1441567.png)
The basic optical properties of PPV-based polymers have been extensively studied due to their potential technological applications. However, a detailed investigation of electronic processes following photoexcitation in the ultraviolet is still lacking. We report photoluminescence measurements on poly(1-methoxy-4-ethylhexyloxy-paraphenylenevinylene) – MEH-PPV in the 2.0–5.6 eV range, with excitation up to 5.6 eV. The photoluminescence spectra lineshape is independent of excitation energy. The photoluminescence efficiency is high for energies well below the absorption maximum due to near-resonant excitation of the longest conjugated segments which are responsible for the PL. It decreases strongly for excitation energies in the range 2.1–2.5 eV (up to the absorption maximum) and slightly from 2.5 to 5.6 eV. The results indicate that states excited in the ultraviolet rapidly relax nonradiatively to the lowest state, from where the usual luminescence occurs.
Journal: Synthetic Metals - Volume 160, Issues 23–24, December 2010, Pages 2409–2412