A1 Refereed original research article in a scientific journal
White-light emitting multi-lanthanide terephthalate thin films by atomic/molecular layer deposition
Authors: Ghazy Amr, Lastusaari Mika, Karppinen Maarit
Publisher: ROYAL SOC CHEMISTRY
Publication year: 2023
Journal: Journal of Materials Chemistry. C
Journal name in source: JOURNAL OF MATERIALS CHEMISTRY C
Journal acronym: J MATER CHEM C
Volume: 11
Issue: 16
First page : 5331
Last page: 5336
Number of pages: 6
ISSN: 2050-7526
DOI: https://doi.org/10.1039/d3tc00464c
Web address : https://doi.org/10.1039/D3TC00464C
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/179466459
Precisely composition-tuned white-light-emissive lanthanide-organic thin films are fabricated using the combined atomic/molecular layer deposition (ALD/MLD) technique. The emission colour characteristics are comparable (and even exceeding) to those measured for commercial incandescent bulbs, fluorescent tubes and LED lamps. The films are composed of up to four lanthanide species (La, Er, Tb, and Eu) and terephthalate as the organic linker molecule. Terephthalate plays multiple roles in the films, as it not only brings mechanical flexibility to the films and defines the distance between the lanthanide ions, but also shows upon UV excitation UV/blue broad-band emission around 300-450 nm. This excitation energy was found to be efficiently transferred to the Er3+ ions, such that the emission could be shifted to the longer wavelengths. Then, Tb and Eu provide the green and red emissions, such that the films in overall show warm white light emission. Finally, using a three-layer composition to control the distribution of the Ln dopants, the emission intensity was increased fourfold.
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