羟氨苄青霉素引起大疱性类天疱疮样疹

Rare-earth ion doped TeO2 and GeO2 glasses as laser materials

All-inorganic cesium lead bromide CsPbBr3 perovskite quantum dots (QDs) are emerging as potential candidates for their applications in optoelectronic devices but they suffer from poor long-term stability due to their high sensitivity to UV irradiation, heat, and especially to moisture. Although great advances in improving stability of perovskite QDs have been achieved by surface modification or encapsulation in polymer and silica, they are not sufficiently refrained from external environment due to nondense structures of these protective layers. In this work, in situ nanocrystallization strategy is developed to directly grow CsPbBr3 QDs among a specially designed TeO2-based glass matrix. As a result, QD-embedded glass shows typical bright green emission assigned to exciton recombination radiation and significant improvement of photon/thermal stability and water resistance due to the effective protecting role of dense structural glass. Particularly, ∼90% of emission intensity is even remained after immersi...

In Situ Crystallization Synthesis of CsPbBr3 Perovskite Quantum Dot-Embedded Glasses with Improved Stability for Solid-State Lighting and Random Upconverted Lasing

We investigate curvature effects on geometric parameters, energetics, and electronic structure of zigzag nanotubes with fully optimized geometries from first-principle calculations. The calculated curvature energies, which are inversely proportional to the square of radius, are in good agreement with the classical elasticity theory. The variation of the band gap with radius is found to differ from simple rules based on the zone folded graphene bands. Large discrepancies between tight binding and first-principles calculations of the band gap values of small nanotubes are discussed in detail.

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Systematic ab initio study of curvature effects in carbon nanotubes

K. Marimuthu

Papers

Concentration effect of Sm3+ ions in B2O3–PbO–PbF2–Bi2O3–ZnO glasses – Structural and luminescence investigations

Composition dependent structural and optical properties of Sm3+-doped sodium borate and sodium fluoroborate glasses

Structural and luminescence properties of Dy3+ doped oxyfluoro-borophosphate glasses for lasing materials and white LEDs

Composition dependent structural and optical properties of Sm3+ doped boro-tellurite glasses

Concentration dependent Eu3+ doped boro-tellurite glasses—Structural and optical investigations