We present a cathodoluminescence study of the spatial distribution Eu2+ and Eu3+ dopants in hydroxyapatite powders. The results demonstrate that europium ions lattice depends on their valence state. Monochromatic images from prismatic powders show although is distributed homogeneously entire powder volume, mainly at edges. luminescence spectrum displayed wide strong blue emission centered 420 nm, while several orange-red emissions covering range 575 to 725 nm. These correspond transitions...

Abstract Implementation of more refined structures at the nano to microscale is expected advance applications in optics and photonics. This work presents additive manufacturing 3D luminescent microarchitectures emitting light visible range. A tailor‐made organo‐metallic resin suitable for two‐photon lithography developed, which upon thermal treatment an oxygen‐rich atmosphere allows creation silicon‐free tetragonal ( t ‐) monoclinic m ZrO 2 . The approach unique because Zr‐resin different...

The conformal atomic layer deposition of a transparent conductive oxide composed Al-doped ZnO (AZO) over three-dimensional (3D) shaped ZrO2 microarchitectures produced using two-photon lithography (TPL) is reported here for the first time. effect morphology, surface roughness, and crystallographic phase (tetragonal monoclinic) on quality properties deposited AZO thin films investigated. No discontinuities, domains, or areas differing from desired chemical composition have been found in grown...

This work reports the ellipsometry analysis of atomic layer deposition (ALD) films ZnO doped with Zr to determine parameters like free carrier concentration and mobility. Thin zinc oxide (ZnO) Zr-doped thickness ∼100 nm were prepared by on sapphire, SiO2/Si(100), Si(100) substrates. Variable-angle spectroscopic was used study their optical properties in 0.5-3.5 eV spectral range. The constants accurately obtained using a model that combines Drude Tauc-Lorentz oscillators Bruggeman effective...

Microscale functional materials permit advanced applications in optics and photonics. This work presents the additive manufacturing of three-dimensional structured phosphors emitting red, green, blue, white. The development is a step forward to realizing colour synthesis within complex architectures relevance integrated or light-emitting sources.

Abstract 3D ceramic architectures are captivating geometrical features with an immense demand in optics. In this work, additive manufacturing (AM) approach for printing alkaline‐earth perovskite microarchitectures is developed. The enables custom‐made photoresists suited two‐photon lithography, permitting the production of (BaZrO 3 , CaZrO and SrZrO ) structures shaped form octet‐truss lattices, gyroids, or inspired like sodalite zeolite, C 60 buckyballs micrometric nanometric feature sizes....

We report a cathodoluminescence (CL) study of β-Ga2O3 nanowires grown by thermal evaporation GaN on Si(100) and Au/Si(00) substrates. Condensation subsequent oxidation metallic Ga is suggested as the growth mechanism nanowires. The show multiple bends or undulations, together with strong UV emission at 3.31 eV weak blue centered 2.8 band component. Au/Si(100) substrates recorded lower CL intensity well-defined eV. A treatment these samples produced an increase quenching band. Thermal...

Undoped and Mn doped SnO2 nanowires, nanobelts, microplates have been grown by a thermal evaporation method that enables the morphology content in structures to be controlled. The structural morphological characterization was carried out scanning transmission electron microscopy (SEM TEM) backscattered diffraction (EBSD). A crystallographic model has proposed describe SnO2:Mn microplates. X-ray photoelectron spectroscopy (XPS) energy dispersive (EDS) demonstrated incorporation of into...

Abstract Morphological and optical characteristics of radio frequency-sputtered zinc aluminum oxide over porous silicon (PS) substrates were studied before after irradiating composite films with 130 MeV nickel ions at different fluences varying from 1 × 10 12 to 3 13 ions/cm 2 . The effect irradiation on the structure was investigated by scanning electron microscopy, X-ray diffraction (XRD), photoluminescence (PL), cathodoluminescence spectroscopy. Current–voltage ZnO-PS heterojunctions also...

Tailoring the properties of microfabricated ceramics through doping can unlock new avenues for additive manufacturing (AM) advanced 3D architectures. The first step to achieving optical functionality is control material morphology, crystallinity, and defects associated with composition produced AM architecture dopants. For this purpose, zinc‐doped zirconia (ZrO 2 :Zn) microarchitectures proposed using two‐photon lithography tailor‐made resin. It found that Zn modulates ZrO :Zn crystallinity...

We report a cathodoluminescence (CL) and x-ray photoelectron spectroscopy (XPS) study of the influence oxygen incorporation on defect structure GaN microrods nanowires. The micro- nanostructures were synthesized by thermal evaporation method, which enables us to incorporate at different concentrations varying growth temperature. HR-TEM measurements revealed that generates stacking fault defects edge dislocations along Amorphous GaOxNy compounds segregated surface XPS, XRD CL suggests...

We present a study of the influence gallium vacancy (VGa) point defects on ferromagnetic properties GaN:Mn and GaN:Mn,O micro- nanostructures. Results demonstrate that generation these enhances signal microstructures, while incorporation oxygen as an impurity inhibits this property. XPS measurements revealed Mn impurities in samples mainly exhibit valence state 2+. Cathodoluminescence (CL) spectra from Mn-doped GaN displayed emissions centered at about 1.97 eV, attributed to transitions...

Abstract In this work, we report the influence of single-ionized oxygen vacancies ( $$V^{\prime}_{{\text{O}}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>V</mml:mi> <mml:mtext>O</mml:mtext> <mml:mo>′</mml:mo> </mml:msubsup> </mml:math> ) as a spin ½ system in ferromagnetic response undoped and Cr-doped SnO 2 nanowires. For study, nanowires were synthesized by thermal evaporation method. Raman, Auger, X-ray photoelectron spectroscopies confirmed...

Pulsed laser treatments have been performed in GaN samples of both n- and p-type conductivity. The induced changes monitored by emissive mode cathodoluminescence (CL) a scanning electron microscope. Emissive observations indicate moderate recrystallization. luminescent emission has characterized types samples, GaN:Si GaN:Mg. Whereas the evolution CL Si doped could be explained occurrence annealing, behavior Mg upon irradiation seems to more complex strong relation with compensation or...

The effect of indentation on the cathodoluminescence (CL) GaN:Si epitaxial films has been investigated in scanning electron microscope. Deformation produces changes defect structure which are monitored through induced cathodoluminescent emission. Besides a general quenching luminescence, an increase relative intensity deep level bands is observed. different annealing treatments CL emission investigated.

Purpose: This study was designed to analyze the differences in central corneal thickness values determined with noncontact specular microscopy and scanning-slit topography. The measurements were performed on same eye. Methods: We analyzed of 93 patients (n = 93) by means (Topcon SP-2000P microscope, Topcon Corp., Tokyo, Japan) topography (Orbscan Topography System II, Orbscan Inc., Salt Lake City, UT). One experienced physician 3 consecutive both devices. Results: obtained pachymetry 17 ±...