The mineral apatite and apatite-like compounds are a class of promising inorganic materials, reported to have a wide range of applications including, but not limited to, oxide fuel cells, phosphors, catalysis, and biomaterials. The mineral could be easily tuned via ionic substitutions for enhancement of various optoelectronic properties. In this study we report characterization of natural apatite crystals from different sources using optical spectroscopy, transmission electron microscopy, and X-ray diffraction. We also note roles of external factors such as high pressure and doping with rareearth elements on the optoelectronic properties of the mineral to explore alternate pathways for material synthesis and potential new applications.
Quantum dots (QD) embedded in polymer matrix are a powerful material system for novel optoelectronic applications. Apart from the typical advantages available from QD systems such as size dependent optical properties and narrow emissions, they can also be used as a future multiplexed sensing device. In this work, we report optical emission from a two-color QD-doped silica and polymer system through photoluminescence measurements. The QD-based thin films could be excited through single wavelength in the visible range, and emitted at two distinct peaks with controllable intensities depending on the ratio of QDs doped into the silica and polymer. The emission increase of the two peaks as a function of excitation intensity was analyzed and compared with more traditional QD films deposited on bulk semiconductor substrates.
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