MEH-PPV photobleaching control by femtosecond pulse shaping

✍ Scribed by Ferreira, Paulo Henrique D. ;Silva, Daniel L. ;Misoguti, Lino ;Mendonca, Cleber R.

• Book ID: 105365038
• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 190 KB
• Volume: 206
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200824153

✦ Synopsis

Abstract

In the work reported here we were able to control the photobleaching of poly[2‐methoxy‐5‐(2′‐ethyl‐hexyloxy)‐1,4‐phenylene vinylene] (MEH‐PPV), excited by two‐photon absorption, using femtosecond pulse shaping. By applying a cosine‐like spectral phase mask, we observe a reduction of three times in the photobleaching rate, while the fluorescence intensity decreases by 20%, in comparison to the values obtained with a Fourier‐transform‐limited pulse. These results demonstrate an interesting trade‐off between photobleaching rate and nonlinear fluorescence intensity. The possible mechanism behind this process is discussed in terms of the pulse spectral profile and the absorbance band of MEH‐PPV. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)