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https://hdl.handle.net/20.500.14279/18179
Title: | Time-resolved photoluminescence study of low-energy emission mechanisms in oligofluorene and polyfluorene films |
Authors: | Kang, Jihoon Jo, Jungho Jo, Youngeun Lee, Sun Young Keivanidis, Panagiotis E. Wegner, Gerhard Yoon, Do Y. |
Major Field of Science: | Engineering and Technology |
Field Category: | Chemical Engineering |
Keywords: | Polyfluorene;Oligofluorene;Time-resolved photoluminescence |
Issue Date: | 8-Dec-2008 |
Source: | Polymer, 2008, vol. 49, iss. 26, pp. 5700-5704 |
Volume: | 49 |
Issue: | 26 |
Start page: | 5700 |
End page: | 5704 |
Journal: | Polymer |
Abstract: | We report time-resolved photoluminescence (PL) spectroscopy study of solutions and thin films of pure penta-fluorenes with varying alkyl side-chain structures. While no low-energy green emissions were observed in solutions, spin-cast and vacuum dried initial films exhibited low-energy emission in time-delayed PL spectra, centered at 490 nm, whose intensity varied strongly with the side-chain structure. In comparison, the films annealed at 170 °C in air showed nearly identical low-energy emission in time-delayed PL spectra, centered at 520 nm, regardless of the side-chain structures. Therefore, our experimental results obtained for pure penta-fluorenes provided clear evidence that the mechanism of the green emission of oligofluorene and polyfluorene films includes both the intermolecular aggregate/excimer formation, emitted around 490 nm, and fluorenone-type chemical defects, emitted around 520 nm. © 2008 Elsevier Ltd. All rights reserved. |
URI: | https://hdl.handle.net/20.500.14279/18179 |
ISSN: | 00323861 |
DOI: | 10.1016/j.polymer.2008.10.006 |
Rights: | © Elsevier |
Type: | Article |
Affiliation : | Seoul National University Max Planck Institute |
Publication Type: | Peer Reviewed |
Appears in Collections: | Άρθρα/Articles |
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