A series of (Lu0.99‐x Er0.01Yb x )2O3 and (Lu0.99‐x Er0.01Yb x )2O2S (x = 0‐0.1) phosphor particles were prepared to investigate their upconversion luminescence properties. Under 980 nm pumping laser, the two phosphors both exhibit strong green emission at ∼520‐573 nm and weak red emission at ∼648‐688 nm arising from 4S3/2/2H11/2→4I15/2 and 4F9/2→4I15/2 transitions of Er3+, respectively. The optimum

We characterize the gain degradations of an Er‐doped fiber amplifier (EDFA) during the exposure of its active Er‐doped fiber to 40 keV X‐rays (∽2.7 mrad(SiO2)/s up to 300 krad) at three different temperatures: ‐40°C, 25°C and 120°C. The spectral dependence of the fiber radiation‐induced attenuation (RIA) was also monitored in situ in the 900‐1600 nm spectral range, highlighting a combined temperature

The magnetic moment and the Curie temperature of the NiCu alloy decrease to a large extent with Cu. Ni60Cu40 alloy with Fe substitutions upto 2 at.% using a polyol mediated synthesis process resulting in enhanced magnetic properties have been obtained. The Ni60Cu39Fe1 and Ni60Cu38Fe2 alloys show fcc phase with Curie temperatures of 237 K and 266 K. The room temperature magnetization measurement shows

In the present work, we synthesized highly ordered TiO2 nanotube arrays on a Ti substrate, in a fluoride‐containing electrolyte, using the electrochemical anodization method, which yields oxide tubes of an amorphous phase. We studied the effect of different thermal annealing profiles for the crystallization of the amorphous TiO2 nanotubes (NTs). We find that the temperature ramping rate has a significant

The influence of Fe in the buffer layer on the laser lift‐off (LLO) of GaN high electron mobility transistors is presented herein. LLO is performed on Fe‐doped GaN films using a KrF excimer LLO system. The morphology, crystal characteristics, and two‐dimensional electron gas (2DEG) characteristics of the GaN films after LLO are characterized using a 3D optical microscope, X‐ray diffraction, and Hall

Metal‐ferroelectric‐metal (MFM) capacitors with Pt/Al‐doped HfO2 (Al:HfO2)/TiN structures were characterized to demonstrate the ferroelectricity of the Al:HfO2 thin films deposited by atomic layer deposition with H2O precursor at various annealing conditions. When the crystallization annealing temperature increased from 750 to 850 °C, the value of ferroelectric remnant polarization (2Pr) increased

The recent discovery of ferroelectric behavior in hafnia‐based dielectrics attributed to the formation of non‐centrosymmetric orthorhombic phase has opened up potential uses in numerous applications ranging from ferroelectric field effect transistors to pyroelectric energy harvesters. Here we report the relative amounts of ferroelectric orthorhombic phase (space group Pca21) in 7 nm thick hafnia‐zirconia

The rhenium disulfide (ReS2) single crystals are grown by chemical vapour transport technique. The powder X‐ray diffraction analysis of the single crystals showed them to possess ReS2 phase with triclinic unit cell structure. The energy dispersive analysis of X‐rays showed the crystals to be slightly rich in sulfur and deficient in rhenium. The optical bandgap obtained of the as‐grown single crystals

An optical absorption (OA) band of interstitial dichlorine monoxide molecules with peak at 4.7 eV and halfwidth 0.94 eV is identified in F2 laser – irradiated (ħω=7.9 eV) synthetic silica glass bearing both interstitial O2 and Cl2 molecules. Alongside with intrinsic defects, this OA band can contribute to solarization of silica glasses produced from SiCl4. While only the formation of ClClO is confirmed

According to a recent report by the World Health Organisation (WHO), antimicrobial resistance (AMR) is considered a global threat comparable to terrorism and climate change. It has been accepted that the use of antibiotics in veterinary or clinical practice exerts a selective pressure, which accelerates the emergence of antimicrobial resistance. Therefore, there is a clear need to detect antibiotic

The two‐dimensional nanosheet Sm2MoO6 was mounted on a bulk three‐dimensional NiS to form a durian‐like 2D/3D heterojunction photocatalyst, and the photocatalytic activity was studied. The photocatalytic activity of the optimal composite catalyst was 8.3 times higher than that of NiS. Compared with Sm2MoO6, it is increased by 186.7 times. On the one hand, it may be attributed to the assembly of two‐dimensional

Bismuth tri‐iodide (BiI3), a promising lead‐free photoelectric semiconductor material, is suitable for photovoltaic applications. Herein, we investigated the effect of halogen doping with bromine (Br) and chlorine (Cl) compounds on the morphology and photovoltaic performances of BiI3 thin films. BiI3‐xXx films doped with halogens were prepared by vacuum thermal evaporation. Scanning electron microscope

In situ plasma etching is a common method to prepare diamond substrates for epitaxial overgrowth to effectuate higher quality. However, there is no practical direct qualitative method established so far to assess the performance of the etching pretreatment. An optimization of the pretreatment process on grounds of high‐resolution X‐ray diffraction measurements is proposed to judge the structural quality

Antimony sulfide (Sb2S3) and antimony selenide (Sb2Se3) with optical bandgaps (E g ) of 1.88 eV and 1.1 eV, respectively; both crystallize in the orthorhombic structure and can produce Sb2SxSe3‐x of intermediate E g for solar cells. We used powder sources of Sb2S3 and Sb2Se3 in different mass ratios in vacuum thermal evaporation to produce Sb2SxSe3‐x thin films of thickness, 455 nm. These films showed

Silver antimony sulfide selenide (AgSbS1.3Se0.7) thin film forms from silver antimony sulfide (AgSbS2, 700 nm) and amorphous selenium (Se, 300 nm), both obtained via chemical deposition, heated in contact at 180 oC for 30 min in an argon ambient. The fcc‐structure of AgSbS2 (cuboargyrite) is maintained in AgSbS1.3Se0.7. The optical bandgap of 1.8 eV (direct‐forbidden) in AgSbS2 reduces to 1.47 eV in

With great pleasure we present this Topical Section of Physica status solidi (a) showcasing an exciting research in the field of diamond science and technology. Diamond is an attractive material not only for basic science but also for innovative technical applications such as quantum technologies, energy transformation and storage, biomedical imaging and treatment. As pointed out by the establishment