Enhancement of Vibrant Up-Conversion in (Ca,Sr)F:Er,Yb,Al Phosphors via Energy Transfer, Localized Interstitial Distortion, and Au Nanostructures.

A remarkable increase in the luminescent intensity of Er-doped CaF up-conversion phosphors was achieved, showing an approximate enhancement of over 1100-fold. This enhancement was realized by incorporating Yb, Al, Sr, and gold nanospheres and nanorods. The substantial improvement in up-converting luminescence effectively enhances sensitivity and efficiency at low excitation power densities.

Photoluminescence Spectra Correlations with Structural Distortion in Eu- and Ce-Doped YAl(Mg,Ge)O ( = 0, 1, 2) Garnet Phosphors.

Garnet-type materials consisting of YAl(Mg,Ge)O ( = 0, 1, 2), combined with Eu or Ce activator ions, were prepared by a solid-state method to determine the structural and optical correlations. The structure of YAl(Mg,Ge)O ( = 1, 2) was determined to be a cubic unit cell (Ia-3d), which contains an 8-coordinated Y site with octahedral (Mg,Al)O and tetrahedral (Al,Ge)O polyhedra, using synchrotron powder X-ray diffraction. When Eu or Ce ions were substituted for the Y site in the YAl(Mg,Ge)O host lattices, the emission spectra showed a decrease in the magnetic dipole - Eu transition and a redshift of the - Ce transition, related to centrosymmetry and crystal field splitting, respectively.

Insights of Peculiar Green-Yellow Emission Occurrence in Ce-Doped Barium Yttrium Orthogermanate Phosphors.

The BaCeNaYGeO orthogermanate phosphor, prepared by LiCl flux assistance under a reducing atmosphere, exhibited a mysterious green-yellow emission at 298 K. A blue-emitting orthogermanate phosphor was expected to be achieved through the lower d-band of Ce ions in the host structure owing to their optical structure geometry. Oxygen vacancies were observed in the phosphors through investigating bond-length fluxations, the oxygen 1s profile, and the Ge/Ge oxidation state, using synchrotron X-ray diffraction refinement, X-ray photoelectron spectroscopy, and Ge K-edge X-ray absorption near-edge structure spectra, respectively.

Self-Activating Strontium Orthoborate Blue Phosphors Induced by Cation and Anion Deficiencies and Their Rare-Earth-Free White Ultraviolet Light-Emitting Diodes.

Self-activating blue-light-emitting strontium orthoborate phosphors, viz., SrBO and SrBO ( ranges from -0.3 to 0.

Nonstoichiometric LaOF Structure and Its Green Luminescence Property Doped with Bi and Tb Ions for Applying White UV LEDs.

Red-green-blue phosphors excited by ultraviolet (UV) radiation for white light LEDs have received much attention to improve the efficiency, color rendering index (CRI), and chromatic stability. The spectral conversion of a rare-earth ion-doped nonstoichiometric LaOF host was explored with structural analysis in this report. The nonstoichiometric structure of a LaOF compound, synthesized by a solid-state reaction using LaO and excess NHF precursors, was analyzed by synchrotron X-ray powder diffraction.

Bi and Eu Activated Luminescent Behaviors in Non-Stoichiometric LaOF Structure.

Optical materials composed of LaBiEuOF ( = 0.001-0.05, = 0-0.

Cannabinoid receptor agonist protects cultured dopaminergic neurons from the death by the proteasomal dysfunction.

Cannabinoids have been proposed to possess neuroprotective properties; though their mechanism of action remains contentious, they are posited to prevent neurodegenerative disorders, including Parkinson's disease, the pathogenesis of which has not been established. Recent studies have demonstrated that induction of proteasomal dysfunction in animal models results in a phenotype similar to Parkinson's disease. Here, we investigated the neuroprotective function of a synthetic cannabinoid-receptor agonist (WIN55.