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Type: Journal article
Title: Ultra-high-resolution greyscale fluorescence images via UV-exposure of thin flexible phosphor films
Author: Riesen, N.
Priest, C.
Lancaster, D.G.
Badek, K.
Riesen, H.
Citation: Nanoscale, 2023; 15(10):4863-4869
Publisher: Royal Society of Chemistry (RSC)
Issue Date: 2023
ISSN: 2040-3364
Statement of
Nicolas Riesen, Craig Priest, David G. Lancaster, Kate Badek and Hans Riesen
Abstract: Thin films of BaFCl:Sm nanocrystals prepared using a polymer binder were used to create fluorescence images. The phosphor films were exposed to a UV-C mercury lamp light source via chromium-coated quartz greyscale masks to create 4 μm resolution greyscale fluorescence images. The mechanism relies on the highly efficient conversion of Sm³⁺ to Sm²⁺ ions upon exposure to UV-C light which displays a large linear dynamic range. The red fluorescence around 688 nm of the Sm²⁺ is then read-out using blue-violet illumination under a laser scanning confocal microscope. The greyscale images with 16 greyscale levels had a resolution equivalent to ∼125 line pairs per mm or ∼6400 dpi. Improvements in the resolution would be possible using collimated UV-C laser exposure of the film or the use of higher resolution photomasks. Ultra-high resolution binary fluorescence images were also created with resolutions down to 2 μm (∼250 line pairs per mm, ∼12 700 dpi). Downstream applications of the technology could include tailored covert or overt anti-counterfeiting labelling.
Rights: © The Royal Society of Chemistry 2023
DOI: 10.1039/d2nr02931f
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Appears in Collections:Physics publications

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