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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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