Doped sol-gel based microstructured layers to improve the light emission of luminescent coatings

Sol-gel based layers doped with Rhodamine B phosphors (RB) were directly microstructured to produce sub-lambda 2D gratings, using nanoimprint lithography. Such an approach enables the simplification of technological processes, since no further etching process is required, which reduces considerably...

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Bibliographic Details
Published inJournal of alloys and compounds Vol. 957; p. 170408
Main Authors Marichez, Léa, Chadeyron, Geneviève, Zambon, Daniel, Réveret, François, Potdevin, Audrey, Boyer, Damien, Gaté, Valentin, Verrier, Isabelle, Jamon, Damien, Gamet, Emilie, Jourlin, Yves
Format Journal Article
LanguageEnglish
Published Elsevier B.V 25.09.2023
Elsevier
Subjects
Chemical Sciences
Diffraction grating
Engineering Sciences
Luminescent coating
Material chemistry
Micro and nanotechnologies
Microelectronics
Microstructuring
Nanoimprint lithography
Diffraction grating
Nanoimprint lithography
Luminescent coating
Microstructuring
nanoimprint lithography
microstructuring
diffraction grating
luminescent coating
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Summary:Sol-gel based layers doped with Rhodamine B phosphors (RB) were directly microstructured to produce sub-lambda 2D gratings, using nanoimprint lithography. Such an approach enables the simplification of technological processes, since no further etching process is required, which reduces considerably the number of technological steps and thus production costs. Surface microstructuring improved fluorophore emission in the visible range. Demonstrations were performed experimentally and samples were characterized using angle-resolved fluorescence. The emissions measured on microstructured luminescent coatings were 3–4 times higher, depending on the angle of observation, than those recorded on flat surfaces. This technological approach is very promising for the next generation of low-cost, high-performance anti-counterfeiting marking processes and for the traceability of objects based on unique optical effects. [Display omitted] •Variations in photoluminescence quantum yields as a function of excitation wavelength and RB concentrations were studied•The nanoimprint lithography technique was used to produce a 2D grating on a luminescent (TEOS/MTEOS)/RB base sol-gel coating.•Surface microstructuring improved fluorophore emission in the visible range.•Angle-resolved photoluminescence was investigated on the luminescent films with and without grating.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2023.170408