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Description
This study explored the development of a light source for a biophotonic sensor by integrating a lead-free halide perovskite-polymer composite thin film or dome on an inorganic UV LED source. This 3D organic/inorganic integrated device was designed to convert photons in the ultraviolet (UV, 350nm) wavelength range to 600nm light using a fluorescence process. The selected halide perovskites fluorescence material Cs4MnBi2Cl12 (CMBC) was synthesized via a precipitation method or by hydrothermal synthesis, employing commercial precursors of CsCl, MnCl₂·4H₂O, and Bi2O3 (or BiCl3). Er doped CMBC was also prepared for enhanced visible light emission. CMBC can be considered as a possible non-toxic alternative to the well-known halide perovskites containing lead (e.g. CsPbCl3). Following optical excitation at 360nm the undoped CMBC and Er: CMPC samples exhibited a broad band, orange-red emission centered at ~605nm. In addition, the Er: CMBC sample also revealed a distinct visible emission centered at ~650nm from an Er3+ intra-4f transition. For biophotonic sensor applications, prototype filters were prepared with varying concentrations of CMBC and either UV resin or cyanoacrylate adhesive in the composite film. This allowed for a comparison between filtered and unfiltered emission spectra, specifically targeting changes in transmittance at selected wavelengths.
| Academic or Professional Status | Faculty |
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