Effect of Eu Ions Concentration in YO-Based Transparent Ceramics on the Electron Irradiation Induced Luminescence and Damage.

Eu-doped YO-based luminescent materials can be used as a scintillator for electron or high energy β-ray irradiation, which are essential for applications such as electron microscopy and nuclear batteries. Therefore, it is essential to understand their defect mechanisms and to develop materials with excellent properties. In this paper, YO-based transparent ceramics with different Eu doping concentrations were prepared by solid-state reactive vacuum sintering.

Lanthanide Functionalized Carbon Quantum Dots for White Light Emission, pH Sensing, and Co (II) Detection.

Carbon quantum dots (CQDs) with fluorescence emission have been widely studied for versatile applications, but facile tunability of the spectral properties of CQDs by doping remains to be further explored. Herein, employing lanthanide ion Eu as a dopant and activator, a simple and efficient synthesis route for pure CQDs and Eu-CQDs was demonstrated using N, N-dimethylformamide, oleic acid, and oleylamine as precursors for carbon sources. In comparison, with the popular citric acid precursor, the as-prepared CQDs and Eu-CQDs exhibited an obviously smaller particle size (1.

ITO-Induced Nonlinear Optical Response Enhancement of Titanium Nitride Thin Films.

A series of TiN/ITO composite films with various thickness of ITO buffer layer were fabricated in this study. The enhancement of optical properties was realized in the composite thin films. The absorption spectra showed that absorption intensity in the near-infrared region was obviously enhanced with the increase of ITO thickness due to the coupling of surface plasma between TiN and ITO.

Red Emitting Solid-State CDs/PVP with Hydrophobicity for Latent Fingerprint Detection.

Fluorescent carbon dots (CDs) are a new type of photoluminescent nanomaterial. Solid-state CDs usually undergo fluorescence quenching due to direct π-π* interactions and superabundant energy resonance transfer. Therefore, the preparation of solid-state fluorescent CDs is a challenge, especially the preparation of long wavelength solid-state CDs.

Optical Temperature-Sensing Performance of LaCeO:Ho Yb Powders.

In this paper, LaCeO powders co-activated by Ho and Yb were synthesized by a high temperature solid-state reaction. Both Ho and Yb substitute the La sites in the LaCeO lattice, where the Ho concentration is 0.5 at.

Color Tunable Composite Phosphor Ceramics Based on SrAlSiN:Eu/LuAlO:Ce for High-Power and High-Color-Rendering-Index White LEDs/LDs Lighting.

LuAlO:Ce phosphor ceramics were fabricated by vacuum sintering. On this basis, a bi-layer composite phosphor was prepared by low-temperature sintering to cover the phosphor ceramics with a layer of SrAlSiN:Eu-phosphor-in-glass (PiG). The optical, thermal, and colorimetric properties of LuAG:Ce phosphor ceramics, SrAlSiN:Eu phosphors and SrAlSiN:Eu-PiG were studied individually.

Tunable Nonlinear Optical Response of ITO Films with Au@Ag Bimetallic Nanoparticles.

The nonlinear optical (NLO) response of indium tin oxide films covered with Au@Ag colloid layer was characterized by a femtosecond single-beam open aperture (OA) Z-scan technique in this study. As the Au@Ag thickness increased, the transition from saturated absorption (SA) to reverse saturated absorption (RSA) was found in these ITO matrix composites. The nonlinear absorption coefficient for these composite materials can be regulated from -6.

Structural and Scintillation Properties of Ce:GdAlGaO Translucent Ceramics Prepared by One-Step Sintering.

Cerium-doped gadolinium aluminum gallium garnet (Ce:GdAlGaO, Ce:GAGG) ceramic is a promising scintillation material. In this study, Ce:GdAlGaO scintillation ceramics were prepared by the one-step sintering of commercially available GdO, AlO, GaO, and CeO powders in a flowing oxygen atmosphere at 1600 °C by solid-phase reaction sintering. For all the Ce:GdAlGaO ceramic samples doped with different amounts of Ce doping, dense ceramics were obtained.

BaAlO:Eu-AlO ceramics for wide range optical temperature sensing.

In this paper, BaAlO:Eu-AlO ceramics were successfully prepared by spark plasma sintering (SPS). The optical properties of the multiphase ceramics doped with different concentrations of alumina were studied. Under excitation with 365 nm ultraviolet light, the luminescent color of the samples can be adjusted by changing the sintering temperature and the contents of alumina addition.

SERS-active WO thin films with tunable surface plasmon resonance induced by defects from thermal treatment.

A series of WO thin films with defects were obtained by thermal treatments from laser irradiation and annealing, respectively. The corresponding tunability of localized surface plasmon resonance properties and the enhancement of Raman scattering intensity were realized due to the defects in the WO thin films after thermal treatments. With the changes of either laser power or annealing temperature, the crystalline quality of WO thin film was declined with a red shift of the surface plasmon resonance wavelength from 464 nm to 482 nm.

Photocatalytic water splitting properties of Cu exchanged Beta zeolites.

Photocatalytic water splitting with solar energy is the most promising and environmentally friendly hydrogen production method. Having an efficient and cost-effective photocatalyst is key to hydrogen production. Cu dopant has been shown to greatly enhance photocatalytic activities.

Mn activated AlO red-emitting ceramic phosphor with excellent thermal conductivity.

An AlO:Mn, Mg red emitting ceramic phosphor, which can be effectively excited by ultraviolet and blue light, was successfully synthesized via solid-state reaction in an oxygen and air atmosphere. The ceramic sintered in oxygen atmosphere has higher optical transmittance and stronger luminescence intensity than the ceramic sintered in the air, which is more suitable for LED application. Since the structure of α-AlO is very simple, it is convenient to study the factors affecting the Mn luminescence.

Size and distance dependent fluorescence enhancement of nanoporous gold.

Nanoporous gold (NPG) has been reported to provide remarkable fluorescence enhancement of adjacent fluorophores due to the metal-enhanced fluorescence phenomenon (MEF), and the enhancement is related with the characteristic length of nanoporosity. To fully understand the effect of NPG on nearby fluorophores, it is desirable to study systems with well-defined metal-fluorophore distances. In this study we investigated the distance effect by using silica as the spacing layer between fluorophores and NPG.