Optical properties of ultraviolet-light soaked states in polyfluorene thin films
| Autor: | Hiroyoshi Naito, Hideaki Takahashi, Kohei Asada |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Photoluminescence
Quenching (fluorescence) Absorption spectroscopy Metals and Alloys Analytical chemistry Infrared spectroscopy Surfaces and Interfaces medicine.disease_cause Photochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Polyfluorene chemistry.chemical_compound chemistry Materials Chemistry medicine Ultraviolet light Absorption (electromagnetic radiation) Ultraviolet |
| Zdroj: | Thin Solid Films. 509:202-206 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2005.09.171 |
| Popis: | Optical properties of ultraviolet (UV)-light soaked states in poly(9,9-dioctylfluorene) (F8) have been studied. F8 thin films, synthesized by Suzuki and Yamamoto coupling reactions, were irradiated by a He–Cd laser (λ = 325 nm) and the UV-light-soaked states were characterized by photoluminescence (PL), optical absorption, Fourier transform infrared absorption and electron spectroscopy for chemical analysis measurements. A photo-induced decrease in PL intensity and PL color change were found in UV-light-soaked F8 thin films. It is shown that the decrease in PL intensity is due to the increase in oxygen-related PL quenching centers and that the PL color change is due to the appearance of 2.2-eV emission bands whose origin is identified to be an exciplex formed between an oxygen-related defect and its nearest F8 polymer chain. The oxygen-related defect, which forms the exciplex, can result from a keto defect (fluorenone) because of the similarity in PL spectra between UV-light-soaked F8 and fluorene–fluorenone copolymers. |
| Databáze: | OpenAIRE |
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