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|Title:||Time-resolved photoluminescence study of low-energy emission mechanisms in oligofluorene and polyfluorene films||Authors:||Kang, Jihoon
Lee, Sun Young
Keivanidis, Panagiotis E.
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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