Extrinsic Influences on Photoluminescence Spectral Lineshape in Thin Films

Matthew J. Dyson, Tom P.A. van der Pol (Corresponding author), Stefan C.J. Meskers (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

Accurate determination of the photoluminescence (PL) spectrum of molecules is crucial in many areas including molecular diagnostics, genome analysis, and organic electronics. However, interpretation of experimental spectra from thin films can be complicated by phenomena extrinsic to the site of photon emission such as optical interference and self-absorption. In this study, the alteration of fluorescence spectral lineshape is modeled from a thin film due to extrinsic factors as function of film thickness, incident angle, bandgap, and Stokes shift. The method is experimentally verified for thin (<400 nm) layers of molecular semiconductors on quartz substrates. Finally, a chart is provided for estimating the magnitude of the error due to extrinsic factors in the bandshape of fluorescence spectra from thin films. This demonstrates that the 0-0/0-1 intensity ratio, an indicator of the nature of excitonic coupling, is especially sensitive to possibly unconsidered influence from extrinsic effects.

Original languageEnglish
Article number2001997
Number of pages8
JournalAdvanced Optical Materials
Volume9
Issue number7
DOIs
Publication statusPublished - 6 Apr 2021

Funding

M.J.D. and T.P.A.v.d.P. contributed equally to this work. M.J.D. thanks the Marie Skłodowska‐Curie Actions Innovative Training Network “H2020‐MSCAITN‐2014 INFORM ‐ 675867” for financial support. T.P.A.v.d.P. acknowledges funding from the Ministry of Education, Culture and Science (Gravity program 024.001.035). The authors also thank Dr. Harm van Eersel (Simbeyond, Eindhoven, The Netherlands) for providing the code to calculate () from () and to adjust the FLUXiM Setfos input parameters, and Prof. Paul Stavrinou (Dept. of Engineering Science, University of Oxford, UK) for the scientific discussion that motivated this work. n E k E

FundersFunder number
Marie Skłodowska‐Curie675867
Ministerie van Onderwijs, Cultuur en Wetenschap024.001.035

    Keywords

    • disordered molecular materials
    • hybrid perovskites
    • optical environment
    • organic electronics
    • photoluminescence spectra
    • photoluminescent (bio)markers
    • thin-film optics

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