This work uses a deep learning approach using convolutional neural networks to locate and classify nanostructures in a heterogenous composition material from TEM imaging. We developed a methodology that allowed us to create 533 ground truth of TEM images with three different classes: 1) silicon oxide nanoparticles, 2) yttrium silicate particles and 3) silicon oxide coating. We performed the classification, location, and segmentation of chemical compounds reaching scores above 80% of accuracy using Mask R-CNN architecture with Anaconda Python 3.7 and the Tensorflow framework under Windows 10.
In this work we have developed white-emitting phosphors that can be activated at long UV wavelengths. A blend of EuAlO3:Eu3+ (red), EuAlO3:Eu2+ (green) and Y2SiO5:Ce3+ (blue), prepared by the combustion synthesis technique, yielded a white luminescence spectrum that can be stimulated with long wavelength UV photons. White emission from rare earth doped single-host yttrium oxyorthosilicates, has been also investigated. (Y0.9625Ce0.0075Tb0.03)2SiO5 exhibits an efficient, nearly D65, white emission with chromaticity x=0.225, y=0.320 due to a non-radiative (inductive) energy transfer between Ce3+ and Tb3+.
Thin-films of europium doped yttrium oxide, (Y1-xEux)2O3, were deposited on sapphire substrates by metallorganic chemical vapor deposition. The films, -400 nm thick, were weakly luminescent in the as-deposited condition. A KrF laser was pulsed once on the surface of the films at a fluence level between 0.9 - 2.3 J/cm2. One pulse was sufficient to melt the film, which increased the photoluminescent emission intensity. Melting of a rough surface resulted in smoothing of the surface. The highest energy pulse resulted in a decrease in luminous intensity, presumably due to material removal. Computational modeling of the laser melting and ablation process predicted that a significant fraction of the film is removed by ablation at the highest fluence levels.
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