A1 Refereed original research article in a scientific journal
Effect of carbon backbone on luminescence properties of Eu-organic hybrid thin films prepared by ALD/MLD
Authors: Safdar Muhammad, Ghazy Amr, Tuomisto Minnea, Lastusaari Mika, Karppinen Maarit
Publisher: SPRINGER
Publication year: 2021
Journal: Journal of Materials Science
Journal name in source: JOURNAL OF MATERIALS SCIENCE
Journal acronym: J MATER SCI
Volume: 56
Issue: 22
First page : 12634
Last page: 12642
Number of pages: 9
ISSN: 0022-2461
eISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-021-06094-8
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/56052985
Here we show that the backbone of the organic ligand has a profound impact on the luminescence characteristics of lanthanide-organic materials. We employ the emerging atomic/molecular layer deposition (ALD/MLD) technique to deposit europium-based thin films where the organic ligands vary in terms of the number of aromatic rings in their backbone (benzene, naphthalene and anthracene). Enlarging the backbone shifts the excitation towards visible wavelengths, but it simultaneously decreases the emission intensity. Moreover, for the Eu-terephthalate films with the single benzene ring as the organic backbone, we investigate the effects of diluting the Eu3+ concentration with Y3+ to reveal that the emission intensity is optimized around 12% Eu3+ concentration. Interestingly, such a dependence of luminescence intensity on the concentration of emitting species suggests that our (Eu,Y)-organic thin films behave more like ionic phosphors than discrete metal-ligand molecules.
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