skip to main content

SciTech ConnectSciTech Connect

Title: Hybrid-state emission in a polythienylenevinylene derivative with an electron deficient moiety

The photoluminescence (PL) of a novel imide-substituted poly(3-thienylenevinylene) derivative (imidePTV) was studied in film and solution. PL quantum efficiency was measured to be more than two orders of magnitude larger than its nonluminescent counterpart, namely, alkyl-substituted PTV and was interpreted as evidence for a near degeneracy of optically allowed 1{sup 1}B{sub u} and optically forbidden 2{sup 1}A{sub g} excitonic states. As a result, coexistence of 2{sup 1}A{sub g} and 1{sup 1}B{sub u} emissions was observed, and the predominance was found to be sensitive to temperature and morphological environment. PL of solutions in solvents of higher polarity and polarizability and from low-temperature films was dominated by the transition from the dipole allowed 1{sup 1}B{sub u} state. On the other hand, the PL spectra of films at high temperature and solutions in solvents of low polarity and polarizability were primarily from the 2{sup 1}A{sub g} state that obtains a finite transmission moment from an asymmetric perturbation mixing with the 1{sup 1}B{sub u}.
Authors:
; ;  [1] ; ;  [2] ; ;  [3]
  1. Department of Physics, University of South Florida, Tampa, Florida 33620 (United States)
  2. Department of Chemistry, University of South Florida, Tampa, Florida 33620 (United States)
  3. Department of Chemistry and Biochemistry, South Dakota State University, Brookings, South Dakota 57007 (United States)
Publication Date:
OSTI Identifier:
22415719
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 142; Journal Issue: 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; DIPOLES; DISTURBANCES; ELECTRONS; EMISSION SPECTRA; FILMS; G STATES; HYBRIDIZATION; IMIDES; MIXING; ORGANIC POLYMERS; PHOTOLUMINESCENCE; POLARIZABILITY; QUANTUM EFFICIENCY; SOLUTIONS; SOLVENTS; TEMPERATURE DEPENDENCE