Photophysical properties of PPP and PPV derivatives bearing polystyrene or polycaprolactone as side groups

COLAK D. G., EGBE D. A. M., BIRCKNER E., YURTERI S., CIANGA I., TEKIN E., ...More

EUROPEAN POLYMER JOURNAL, vol.45, no.3, pp.940-945, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 45 Issue: 3
  • Publication Date: 2009
  • Doi Number: 10.1016/j.eurpolymj.2008.11.040
  • Journal Name: EUROPEAN POLYMER JOURNAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.940-945
  • Istanbul Technical University Affiliated: Yes

Abstract

This contribution reports on detailed photophysical investigations of poly(p-phenylene) PPP and poly(p-phenylene-vinylene) (PPV) derivatives laterally decorated with polystyrene (PPV-PSt) or poly(epsilon-caprolactone) (PPP-PCL, PPP-altPCL, PPV-PCL and PPV-PCL-Br). The polymers emit blue and exhibit very high relative and absolute photoluminescence quantum yield, Phi(f), in dilute solution, thin film (spin-coated and inkjet-printed) and bulk state. This is ascribed to the presence of the lateral macromolecules, which suppress the strong pi-pi interactions and consequently excimers formation. Lower Phi(f) value was obtained for the bromine containing polymer and its corresponding model compound dibromodistyryl-benzene Br-2-DSB, which was ascribed to heavy atom effect enabling intersystem crossing from S-1 to T-1. However, studies at 77 K did not reveal phosphorescence, in contrast an enhancement of the fluorescence intensity with respect to room temperature measurement was observed. (C) 2008 Elsevier Ltd. All rights reserved.