We report on the polarized spectroscopic properties and efficient laser emission of Yb0.19Y0.34Lu0.12Gd0.35Ca4O(BO3)3, a newly developed (Yb, Y, Lu, Gd) mixed oxyborate crystal. The strongest absorption is found to occur at 976.6 nm for E//Y, with a cross-section measured to be 2.05 × 10−20 cm2; the main emission band important to laser action appears to be strongest for E//Z, its maximum cross-section

Scheelite related rare-earth double molybdate with the formula of NaLa(MoO4)2 is a promising scintillator for investigating the neutrinoless double beta decay process. In this study, NaLa(MoO4)2 crystal was grown by the vertical Bridgman method using spontaneous crystallization. The as-grown NaLa(MoO4)2 crystal exhibited yellow and dark blue in color (from top to the bottom). The powder x-ray diffraction

Phosphonates are efficient corrosion and scale inhibitors commonly used in industrial circulating water systems. However, conventional detection methods cannot accurately detect their concentration in some water bodies and sludge because of their low concentration. In this study, a ratiometric fluorescent probe was constructed based on quercetin (QC) and divalent zinc ion (Zn2+) to comparatively detect

This work relates to the synthesis, structural, and spectroscopic characterization of praseodymium and sodium co-doped Sr3(BO3)2. This material was evaluated concerning its suitability as a photo- or radioluminescent UV-C emitting compound. Beyond recording the photoluminescence and radioluminescence, diffuse reflectance and temperature dependent spectra were recorded. Furthermore, the structure refinement

A striking correlation is observed between the characteristic defect-mediated deep level luminescence and deposition temperature of the zinc oxide (ZnO) thin films made by atomic layer deposition (ALD) technique. Near-ideal and virtually defect-free zinc oxide films are deposited at a temperature of 150°C. However, distinct long-wavelength broadband luminescence features are identified for yellow (maxima

We report on the growth, structure, polarized spectroscopy and first laser operation of a double molybdate compound featuring a layered structure – the monoclinic Nd:CsGd(MoO4)2. Single-crystals of 3 at.% Nd:CsGd(MoO4)2 are grown from the flux using cesium trimolybdate (Cs2Mo3O10) as a solvent. They crystallize in the monoclinic system (sp. gr. P2/c) with lattice constants a = 9.5239(4) Å, b = 5.0752(5)

Eu2+-doped phosphors Sr2MgSi2O7: xEu2+ (x = 1–5 mol%) with blue color are synthesized by the co-precipitation method. The X-ray diffraction patterns of these phosphors indicate a tetragonal crystal structure. The emission peak centered at 486 nm is attributed to the 4F7→ 4F65D1 transitions of Eu2+ ions with CIE coordinates of (x = 0.176, y = 0.637). We use Sr2MgSi2O7: 4 mol% Eu2+ phosphors to find

Since 2003, self-heating effect of phosphor which reduces the efficacy and reliability of phosphor conversion (Pc) light emitting diodes (LEDs), has been a growing research area of opto-thermal Pc-LED modeling. However, few studies have focused on the particles based nature of the phosphor self-heating. Based on a new approach, accurate Montro Carelo ray tracing simulations are performed in regions

Eu2+-activated Ca3ZrSi2O9 (Ca3ZrSi2O9:Eu2+) phosphors were successfully synthesized by an amorphous metal complex method with the use of propylene glycol-modified silane. We studied the photoluminescence and crystallographic properties of Ca3ZrSi2O9:Eu2+ as a function of total Eu content (x) in Ca3−xEuxZrSi2O9. The Ca3ZrSi2O9:Eu2+ samples with low Eu2+ contents (x = 0.003–0.030) had a green emission

Bismuth silicate glasses at various compositions of Mn2+ and Yb3+ were successfully synthesized by conventional melt and quenching method of 40% Bi2O3: 60% SiO2. Mn2+ presents a simultaneous green-orange emission by means of simultaneous four and six folded coordination when exciting with 350 nm and by up-conversion when exciting with 980 nm Yb3+ presents its known 976 nm emission by its 2F5/2 → 2F7/2

Optical features of Dy3+:YAP and Dy3+/Tb3+:YAP single crystals that were successfully fabricated by the Czochralski method were reported. The thermal behaviors and XRD rocking curves of the grown Dy3+:YAP crystal were carried out. The identified broad absorption bands of Dy3+:6H15/2→4I15/2 with FWHMs approximately to 11 nm and the moderate absorption cross-sections at 450 nm in both crystals, imply

In photodynamic therapy, a beam of incident light on the target causes interactions with the photosensitizing agent in the patient, subsequently killing cancerous cells through chemical and biological processes. The objective of this work was to describe for the first time the use of the FXL-mblue detector in dosimetric applications with irradiations from red LED light and using the UV–Vis spectrophotometry

A novel series of europium doped potassium titano telluroborate (Eu3+: KTTB) glasses were prepared with the melt quenching and characterized with XRD, SEM, FTIR, UV–Vis–NIR spectrometer, PL etc. And their bonding parameter (δ), the Judd-Ofelt (J-O) parameters, as well as the radiative parameters such as the stimulated emission cross-section, the lifetime and the quantum efficiency, were calculated

A newly developed copper, lithium, and potassium-activated magnesium oxide (MgO:Cu0.001%,Li10%,K10%) using solution combustion synthesis (SCS) method is shown to have promise as a thermoluminescence material. Its sensitivity, dose dependence, spectral distribution of radioluminescence (RL) emission, glow curve characteristics and storage stability are found as all favorable for dosimetric purposes

The various heating rate (VHR) method is used to determine the activation energy (E) of traps responsible for thermoluminescence (TL) peaks. The VHR method was developed and works well for single glow peaks. However, it is often applied to multiple overlapping peaks where one of the peaks is dominant. The use of VHR method for TL curves consisting of several peaks for determining the activation energy

In this paper, we have designed dual-mode imaging agents LuOF: Nd3+ NPs, which can provided bimodality imaging of NIR-to-NIR-II luminescence and X-Ray computed tomography. The as-prepared samples prepared by hydrothermal method possessed irregular paving stone shapes with size distribution of 10∼15 nm. The structure analysis showed the samples were pure cubic phase. Under the excitation of 808nm laser

In this work, we investigated the structural and optical properties of zinc tellurite glass matrices doped with Tm3+ and Dy3+. Raman spectra show the structural units and vibrational modes of two glass matrices composed of TeO2 and ZnO. The chemical composition of the glass and the doping with the rare earth ion changed the frequency and intensity of the Boson peaks, Te–O–Te, TeO4, and TeO3 structural

Although naturally occurring luminescence materials such as quartz and feldspars are generally used for radiation dosimetry and dating, natural borates may also stand as a promising material for dosimetry and dating. We report thermoluminescence (TL) and optically stimulated luminescence (OSL) of one of the most abundant boron minerals in Turkey namely, ulexite (NaCaB5O6(OH)6·5H2O). An X-ray diffraction

The photoluminescence (PL) and PL excitation (PLE) spectra of CdTe/ZnTe asymmetric double quantum well (QW) structures are studied on a series of samples containing two CdTe layers with nominal thicknesses of 2 and 4 monolayers (ML) in the ZnTe matrix. The samples differ in the thickness of the ZnTe spacer between CdTe QWs which is 45, 65 and 75 ML. It has been found that at above-barrier excitation

This work aims at studying optical properties of Eu3+ dopant in K0·3Bi0·7F2.4 host and seeking their applications. A series of orange red emitting K0·3Bi0·7F2.4:Eu3+ phosphors were synthesized via a chemical precipitation reaction method at room temperature, which is convenient, economical and less time consuming. XRD and Rietveld refinement results confirm the pure phase of as-prepared materials. The

Time-dependent profiles of phototransferred thermoluminescence (PTTL) of Al2O3:C, Mg are presented and analysed. Whereas qualitative discussions consider theoretical predictions, mathematical analysis of the profiles is based on experimental results. The thermoluminescence glow curve of unannealed Al2O3:C, Mg measured at 1 °C/s following irradiation to 2 Gy consists of at least eight peaks. There is

The effect of the lead or erbium co-doping upon the spectroscopic properties has been systematically investigated through the analysis of the absorption and emission spectra of Bi doped fibre (BDF), Bi/Pb and Bi/Er co-doped fibre (BPDF and BEDF). All these BDFs have a broadband emission from 1000 nm to 1600 nm. The Pb or Er co-doping in BDFs will evidently reduce the formation of bismuth related active

An optically semiconductor metamaterial sensor for solute concentration sensing is designed based on plasmonically induced transparency (PIT) effect. The concentration of two aqueous solutions, NaCl and ethanol in water solutions are investigated using the proposed optical sensor. The optimization process to find the best geometrical size for the antennas and also the material thicknesses cause to

Local electric fields modulate a variety of cellular processes and are particularly relevant in the nervous system. Signal propagation along an axon occurs through small (around 100 mV) rapid changes in the potential across the cell membrane. Experimental techniques capable of measuring voltage changes in cells, tissue, and animal models have been instrumental in understanding cell signaling in the

A series of Sr8.5-mMg2+m(PO4)7:Eu2+,Mn2+ (m = 0 and ±0.5) phosphors were prepared by solid-state reaction. The phase purity, luminescence properties and thermal stability were investigated systematically. Under 365 nm excitation, the Sr8.5-mMg2+m(PO4)7:Eu2+ exhibits a wide emission band covering from 425 to 850 nm with three main peaks centered at 412, 515 and 625 nm, which are attributed to the 4f65 d1→4f7

We studied spectral properties of 5-Bromoindole (5-BrI) in poly (vinyl alcohol) (PVA) film. The fluorescence of 5-BrI in PVA films is similar to indole in PVA film but strongly quenched compared to unsubstituted indole. The quantum yield of 5-BrI is only 0.0034 comparing to 0.26 of indole. In contrast, phosphorescence of 5-BrI in PVA is comparable to indole phosphorescence in magnitude and lifetime

Bismuth Vanadate (BiVO4) is a well-known industrial pigment, a microwave dielectric material as well as an efficient photocatalyst for the degradation of organic pollutants and photoelectrochemical water splitting. Here, we report a BiVO4-based upconversion ceramic material for high-sensitivity and high-temperature optical thermometry. Yb/Er-doped BiVO4 (BiVO4:Yb/Er) ceramic is prepared by microwave

The 5D0 – 7Fn fluorescence of Eu3+ ions in Y2O3 thin films grown on Al2O3 substrates was studied. The films were produced by laser molecular beam epitaxy. The spectral lines revealed small inhomogeneous broadening which evidences for small distortions of cubic lattice. The measurements of the fluorescence lifetimes provided an indication of photon density of states and local field effects due to a

A novel Dy:LuAG transparent ceramic was fabricated by a solid-state method, and it has the potential to be used as the gain medium of yellow laser generated by blue LD pumping. The spectroscopic parameters were determined by the Judd-Ofelt theory, and Ω2, Ω4, Ω6 were calculated to be 0.57×10−20 cm2, 1.44×10−20 cm2, 0.68×10−20 cm2, respectively. An intense yellow emission band, corresponding to the

In present report, CaTi4O9: 1 at% Er3+, 1 at% Yb3+ phosphors have been synthesized via sol-gel method and reported herein for its temperature sensing performance. XRD spectra confirms high crystallinity and successful inclusion of rare earth (RE) ions into CaTi4O9 as the dopant ions do no induce any change in the peak position. The X-ray diffraction analysis indicates that the host calcium titanate

GdScO3 single crystal codoped with Tm3+ and Tb3+ ions was successfully grown by the Edge-defined Film-fed Growth Method (EFG) for the first time. Absorption, fluorescence spectrum and fluorescence lifetimes of the grown crystal at room temperature were measured. The absorption cross-section at 789 nm was calculated to be 8.20 × 10−21 cm2. The emission cross-section was 1.35 × 10−21 cm2 at 1504 nm with

We demonstrate the applicability of a ratiometric luminescence thermometer to microelectronic components. The thermometer, which consists of a 980 nm laser diode, two optical filters, two photocells and two multimeters, works on the basis of thermal effect on luminescence intensity ratio of 980-nm-upconverted 530 and 550 nm emissions of micron-sized Er3+/Yb3+-codoped NaGd(WO4)2 crystalline phosphor

In recent experiments, a novel chromophore (N, N,-bis (salicylidene)-(2-(3″4′-diaminophenyl) benzothiazole) (BTS)) with double hydrogen bond structure was synthesized, and the typical excited-state intramolecular proton transfer (ESIPT) fluorescence phenomenon was observed in dichloromethane (DCM) [Luı’s Gustavo Teixeira Alves Duarte et al. Phys. Chem. Chem. Phys., 2019, 21, 1172–1182]. However, due

Nd (0.8 at.%) co-doped Yb (0.8 and 3.0 at.%):YVO4 single crystals were grown by optical floating zone technique for the first time to the best of our knowledge. The absorption spectra revealed strong absorption for π-polarization (E||c) than the σ-polarization (E┴c) for both the Yb concentrations due to anisotropy of the crystal. The estimated effective Judd-Ofelt parameters are 11.8675x10-20, 5.1577x10-20

The chase of perfect solvents used in liquid scintillation cocktails practically resulted in the existence of two groups based on representatives of linear alkylbenzene group and a group of naphthalene derivatives. The objectives of this paper were to evaluate spectral and main detection parameters, including the pulse shape discrimination suitability, of Diethyl-, Propyl-, and Dodecylbenzene as representatives

Adding sodium citric as chelator, NaY(MoO4)2: Pr3+, Tb3+ phosphors were prepared by hydrothermal method. XRD (X-ray diffraction) is employed to confirm the microscopic arrangement of the samples, and the test data show that phosphors are body – centered tetragonal structure. The FE-SEM (Field Emission Scanning Electron Microscope) results indicate that the addition of sodium citrate has a certain effect

This work reports the ellipsometric study of trivalent erbium (Er3+) doped monocrystalline barium yttrium fluoride (BaY2F8), which has recently been shown to be one of the best photon upconversion (UC) materials available. This spans the BaY2F8 applications in a large range of wavelengths, from ultraviolet (UV) to near-infrared (NIR). We detail the optical properties of BaY2F8: Er3+ (0.5 mol%, 10 mol%