Absolute photoluminescence quantum efficiency of P3HT/CHCl₃ solution by Thermal Lens Spectrometry

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• 作者：R.A. Cruz ; T. Catunda ; ^{tomaz@ifsc.usp.br} ; W.M. Facchinatto ; D.T. Balogh ; R.M. Faria
• 关键词：Photoluminescence quantum efficiency ; Thermal Lens Spectrometry ; Polythiophenes ; Photophysical properties ; Photodegradation
• 刊名：Synthetic Metals
• 出版年：2013
• 出版时间：1 January, 2013
• 年：2013
• 卷：163
• 期：Complete
• 页码：38-41
• 全文大小：369 K

文摘

Thermal Lens Spectrometry (TLS), as well as all photothermal methods, rely on the determination of the fraction of absorbed energy converted in heat (¦Õ), which in turn is related to photoluminescence quantum efficiency (¦Ç). In this study, we have used TLS to measure ¦Ç of Poly(3-hexylthiophene) (P3HT) dissolved in chloroform as a function of concentration and excitation wavelength. For samples synthesized by oxidative polymerization (¡«74 % HT content), ¦Ç = 0.39 ¡À 0.02 was found to be constant with excitation energy (UV-vis, 335-514 nm) and concentration, from 10^?4 to 0.6 mg/mL. The value of ¦Ç was practically the same as that of a commercial regioregular P3HT (>95 % HT content), measured under the same conditions. The photodegradation effect was also quantitatively analyzed. Although the average emission wavelength of the photo-degraded sample depends on excitation wavelength, both ¦Õ and ¦Ç are constant in the UV-vis range.