University of Hertfordshire

  • Tatiane Pereira
  • Monika Warzecha
  • Luis Andrade
  • Junior Reis Silva
  • Mauro Luciano Baesso
  • Callum J. McHugh
  • Jesus Calvo-Castro
  • Sandro Lima
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Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Early online date7 Oct 2020
DOIs
Publication statusE-pub ahead of print - 7 Oct 2020

Abstract

Photoluminescence quantum yields denote a critical variable to characterise a fluorophore and its potential performance. Their determination, by means of methodologies employing reference standard materials, innevitably leads to large uncertainties. In response to this, herein we report for the first time an innovative and elegant methodology, whereby the use of neat solvent/reference material required by thermal lens approaches is eliminated by coupling it to photoluminescence spectroscopy, allowing for the discrimination between materials with similar photoluminescence quantum yields. To achieve that, both radiative and non-radiative transitions are simultaneously measured by means of a photoluminescence spectrometer coupled to a multiwavelength thermal lens spectroscopy setup in a mode-mismatched dual-beam configuration, respectively. The absorption factor independent ratio of the thermal lens and photoluminescence signals can then be used to determine the fluorescence quantum yield both accurately and precisely. We validated our reported method by means of rhodamine 6G and further applied in three novel structurally related diketopyrrolopyrrole based materials to, contrary to results obtained by other methods, unveil significant differences in their photoluminescence quantum yields.

Notes

© Royal Society of Chemistry 2020. This is the accepted manuscript version of an article which has been published in final form at https://dx.doi.org/10.1039/D0CP03794J.

ID: 22772207