Highly Nonstoichiometric YAG Ceramics with Modified Luminescence Properties

Luminescence and luminescence quenching of highly efficient Y2Mo4O15:Eu3+ phosphors and ceramics

A good LED phosphor must possess strong enough absorption, high quantum yields, colour purity, and quenching temperatures. Our synthesized Y2Mo4O15:Eu(3+) phosphors possess all of these properties. Excitation of these materials with near-UV or blue radiation yields bright red emission and the colour coordinates are relatively stable upon temperature increase. Furthermore, samples doped with 50%...

Enhanced luminescence and photomagnetic properties of surface-modified EuO nanocrystals.

EuropiumII oxide (EuO) has localized narrow 4f orbitals that exist as the degeneracy levels between the conduction band (5d orbitals of EuII) and the valence band (2p orbitals of O2-).[1] The 4f-5d electron transition and spin configuration of EuO lead to unique optical, magnetic and electronic properties.[2] We recently successfully prepared of a spindle-shape EuO nanocrystals (mean diameter: ...

Cavitation Damage During Flexural Creep of SiAlON–YAG Ceramics

Cavitation damage in flexure bars crept at 1170°C was studied by a density measurement technique. The cavity density within the flexure beams could be approximated by a linear function of position from the tensile surface. A threshold stress for cavitation damage is suggested from the results of this study. Below the threshold tensile stress, cavitation ceases, whereas above the threshold, cavi...

Luminescence Properties of AlN Ceramics and Its Potential Application for Solid State Dosimetry

Luminescence Properties of TeO2-LiF-Gd2O3 Glasses

In this work, the structural properties and spectroscopic behavior 80 mol.%TeO2-20mol.%LiF glasses which were doped with 0. 05, 0. 2 mole% Gd2O3 have been studied. It was shown that,  by increasing the amount of Gd2O3 the glass stability was decreased. The PL emissions at 431nm and 627nm wavelengths were distinguished by 320nm excitation. The FT-IR analysis showed deformed TeO4 groups in these ...