Please use this identifier to cite or link to this item: https://ktisis.cut.ac.cy/handle/10488/18179
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://ktisis.cut.ac.cy/handle/10488/18179
ISSN: 0032-3861
DOI: 10.1016/j.polymer.2008.10.006
Rights: © Elsevier
Type: Article
Affiliation : Seoul National University 
Max Planck Institute for Polymer Research 
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