The present work concerns the upconversion luminescence in Cr3+:YAG single crystal under infrared laser irradiation. During the experiment, 404 nm, 808 nm, 980 nm, and 1064 nm laser excitation sources in range of −150 °C–600 °C were employed. A strong red light emission was detected in the bulk of the samples under the infrared excitation. The red emission originated from 4T2g→4A2g transition of Cr3+

The possibility to design and intentionally tune the luminescent properties of phosphors, e.g. their emission colour, quantum yield and kinetic behavior, is of fundamental significance and a challenge for numerous applications. Usually, to obtain multicolour emission, multiple nanomaterials with different co-dopants combinations, sizes or chemical architectures are synthesized and characterized. Of

The chemical composition of (SiO2)59.9 – (PbO)30 – (Pr2O3)0.1 – (Sb2O3)x: (Al2O3)y – x have chosen for present glass synthesis, where the variable ‘x’ varies from 0 to 10 mol% and againstly ‘y’ varies from 10 to 0 mol% with a step size of 2 mol%. The samples were characterized by structural, photo and thermoluminescence techniques. The evolutions of thermal stability, elastic modulus, micro hardness

The authors report the optimization of vertically coupled active layers of InAs quantum dots (QDs) grown epitaxially following a unique in-situ growth strategy to achieve controlled strain propagation in subsequent layers resulting in homogenous dot-size distribution. The analysis comprises of bi, tri, penta, hepta and deca coupled layers which have been characterized for their optical properties using

In this paper we report the results of investigations on optical properties in the short-wavelength spectral range of thulium doped Y2O3 nanocrystals and PMMA-based polymer nanocomposites doped with them. The set of thulium doped Y2O3 nanopowders differing in dopant concentrations was examined with respect of structural features and UV-blue emission properties. In particular, the concentration-dependent

Transitions from the singlet electronic excited states higher than S1 level (S2) to the fundamental state (S0) are unlikely, although such transitions are observed for perylene derivative compounds. This rareness led us to investigate the role of the molecular structure of two perylene derivatives (bis(butylimido) – BuPTCD and bis(phenetylimido) – PhPTCD), as well as their supramolecular arrangements

The Sn-based perovskite light-emitting diodes (PeLED) with the structure of (ITO)/MoO3/4,4′-cyclohexylidenebis[N,N-bis(p-tolyl)aniline](TAPC)/4,4′,4′-Tris(carbazol-9-yl)-triphenylamine (TCTA)/perovskite/1,3,5-Tri(m-pyrid-3-yl-phenyl)benzene (TmPyPB)/lithium fluoride(LiF)/Al were fabricated by thermal evaporation and in-situ annealing. The perovskite emitting layers were annealed at the various temperature

Temperature-dependent cathodoluminescence (CL) measurements were performed for homoepitaxial chemical vapor deposited (CVD) diamond from 10 K to room temperature. With the increment of temperature, the unusual phenomena that the integrated intensities of free-exciton emission initially rise and then decrease, have been observed. The model based on trapping and thermal release of excitons was applied

Alexandrite mineral (BeAl2O4:Cr3+) powder incorporated in a fluorinated polymer was prepared in the form of pellets. A mixture with 20 wt% of the alexandrite in the pellet had the luminescence behavior evaluated as a function of exposure to ionizing radiation using the optically stimulated luminescence (OSL) technique. The OSL measurements were evaluated in terms of dose-response (beta dose from 0

In this work, the authors have investigated the optical and morphological characteristics of uncapped InAs quantum dots (QDs) and their sensitivity to the surface passivation. The temperature dependent carrier transfer mechanism between self-assembled vertically coupled InAs surface quantum dot (SQD) and underneath buried quantum dot (BQD), separated by a thin spacer layer is investigated. Oxide layer

Efficiency enhancement of solar cells is a goal of the photovoltaic industry, and different approaches can be used to achieve this objective. For example, the modification of the incident solar spectra using down shift spectral converters covering the solar cell represents an alternative that has been reported in the literature. In this case, there is an interplay between the gain in the efficiency

Visible to near-infrared quantum cutting and 2.0 μm near-infrared emissions have been obtained in Ho3+/Yb3+ co-doped oxyfluoride transparent glass-ceramic, containing cubic CaF2 nanocrystals, under 473 nm excitation. The formation of CaF2 nanocrystals and the incorporation of Ho3+/Yb3+ ions into these nanocrystals have been confirmed from x-ray diffraction and photoluminescence studies, respectively

Rhodamine B hydrazine was designed as a novel dual-channel ion probe detecting to nitrite among anions and mercury ion among cations, which shows downshifting (DS, the normal PL process) and upconversion (UC, the emission of short-wavelength excited by long-wavelength light) fluorescence enhancement responding. This probe in UC channel has ten times wider ions detection range than in DS channel, while

The processes leading to the appearance of phosphorescence and delayed fluorescence in organic molecular materials compete. This paper compares the ratio of the intensities of delayed fluorescence and phosphorescence with the pulse shape discrimination (PSD) capability of organic scintillators. The paper considers hot-pressed polycrystals and composite samples containing single-crystal organic grains

Sm3+-doped β-dicalcium silicate (β-Ca2SiO4: Sm3+) was resoundingly prepared by the traditional high-temperature solid-state reaction method. The crystal structure, morphology and composition of β-Ca2SiO4: Sm3+ before and after mineralization was characterized by X-ray diffractometer (XRD), fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy

A novel adjustable dual excited emission Eu2+/Eu3+ co-doped Ca4Si2O7F2 phosphor are reported. Unlike most of Eu2+ doped inorganic compounds, in the host lattice Ca4Si2O7F2, partial Eu3+ can still exist stably even in reducing atmosphere. The adjustable dual excited emission from blue light to red light can be found by changing the wavelength of excitation emission or the concentration of europium doped

We investigated the structural and luminescent properties of Eu3+-doped CaHfO3, which was synthesized using the solid-state reaction method. The crystal structures of the samples were analyzed by applying the Rietveld refinement technique on their X-ray diffraction patterns. Because of cation vacancies and/or interstitial oxygens, the unit-cell volumes of the samples increased, and the local lattice

Mn4+ and Sm3+ singly doped and Mn4+/Sm3+ codoped CaGdMgSbO6 (abbreviated as CGMS) phosphors with double perovskite structure have been successfully prepared by the solid-state reaction. X-ray powder diffraction and luminescence spectra were used to analysis their crystal phases and optical properties. Especially, temperature-dependent luminescence spectra and luminescence decay curves of the CGMS:Mn4+/Sm3+

The exciton-phonon coupling plays an important role in the optical properties of two-dimensional (2D) materials. In the preparation of 2D TMDC films, there are often different degrees of intrinsic defects, which have significant impacts on their optical and electrical properties. Here, we have investigated the effect of intrinsic defects on resonant Raman spectroscopy (RRS) in WS2. In a modified chemical

Laser-induced phosphorescence based on luminescent particles is a suitable technique for remote temperature sensing. The luminescence characteristics of the phosphor (Sr,Ca)SiAlN3:Eu2+ (”SCASN”) were investigated regarding the suitability of the material for phosphor thermometry. The phosphor has a high quantum efficiency, a very broad excitation band, an emission peak centered at about 620 nm and

The work was aimed at development of glasses for encapsulation of self-glowing crystals, doped with alpha radionuclides. Bismuth borosilicate-based glass systems doped with Eu3+, В2О3-ЅіO2-Аl2О3-Bi2O3-MO (where M = Ba, Sr and Zn) (Si–Bi -x), with various concentrations of activator were studied. The optimal synthesis conditions were selected, the composition of the obtained glasses was investigated

A new aluminum-oxynitride Ce3+-Tb3+ and Ce3+-Mn2+ co-doped Mg0·695Si0·695Al1·39O3·65N0.35 (MSAON) have been prepared by the high-temperature solid-state method at 1500 °C. The structure, photoluminescence properties, energy transfer (ET) mechanism, thermal quenching behaviors have been investigated. The MSAON host has been formed based on the co-substitution method of cation pair. Under UV excitation

Luminescence and energy-transfer mechanisms in 60TeO2:40ZnO glass codoped with Dy3+and Pr3+ is investigated. Two sets of Dy3+/Pr3+ codoped samples were synthetized, each with a fixed donor-ion concentration. The photoluminescence under UV-VIS excitation revealed emissions in 437, 485, 528, 540, 613, 644, 684, 706, and 730 nm (Pr3+), and in 480, 574 663, and 753 nm (Dy3+). The emission intensity behavior

Lead halide perovskites have attracted tremendous attention recently due to their great success in the fields of photovoltaic technologies and light-emitting devices. In this work, the excitonic photoluminescence (PL) properties of all-inorganic perovskite CsPbBr3 were investigated in detail via temperature-dependent PL and Raman spectroscopy in the range of 87 K–297 K, benefiting from our recent work

In the present work, we exploited the capability of the trivalent thulium (Tm3+) ions doped sodium niobate (NaNbO3) nanocrystals as an optical nanothermometer with a giant relative thermal sensitivity (Sr) of up to 12%°C−1. Tm3+:NaNbO3 nanoparticles, under excitation at 1064 nm using a Q-switched and mode-locked Nd:YAG laser, provided emissions at multi-wavelengths from 460 nm to 840 nm through non-parametric

This special issue explores the extraordinary luminescence properties of metal halide perovskites. Metal halide perovskites have emerged at the forefront of next-generation, thin-film semiconductors for photovoltaic and light-emitting applications. These materials exhibit remarkable optoelectronic properties such as long charge carrier diffusion lengths and high radiative emission efficiencies, which

A vibration-free, optical cooling refrigerator may imply revolutionary applications in different fields, therefore it is vital to explore new materials suitable for laser cooling below the cryogenic temperature. Here we demonstrate that the Yb3+-doped LuLiF4 crystal is a promising material that could reach the cryogenic temperature limit (123 K) or even lower. With the doping concentration of 7.5%

This contribution exhibits the luminescence properties of BaHfO3: Tb3+ perovskite ceramics. The main objective is to know the effect on the luminescent properties of the trivalent Terbium ion (Tb3+), when it is introduced into a crystalline structure of high symmetry such as perovskite, where it can occupy any of two sites available in the lattice. The synthesis of these nanocrystal powders was conducted

Yb3+-doped oxyfluoride glasses and glass ceramics containing KZnF3 nanocrystals were obtained by melt-quenching. Under excitation of a 980 nm laser, a strong blue emission from Yb3+-Yb3+ cooperative upconversion was observed in the glass sample, which increased by five times in glass ceramics after heat treatment for 20 h. The photoluminescence mechanism and sample properties were investigated by X-ray

Photoluminescence (PL) properties of Zn0.8Mg0.2O film are investigated under high excitation and low temperature. With increasing excitation intensity, emission from the inelastic exciton-exciton scattering gradually dominates, meanwhile the bound exciton emission decreases. The exciton binding energy is estimated to be ~110–128 meV from the energy of P-band and PL thermal quenching, much higher than

Terbium doped calcium fluoride (CaF2:Tb3+) and cerium co-doped CaF2:Tb3+ (CaF2:Ce3+, Tb3+) nanoparticles were synthesized by the hydrothermal method by using citric acid (Cit) as surfactant. The as-synthesized nanoparticles have good dispersibility in water to form an aqueous transparent dispersion at a concentration of 20 mg/mL. The nanoparticles have the CaF2-type cubic structures. Photoluminescence

Materials with pressure-induced luminescence is a type of important energy-storage materials that can release the stored energy in form of light upon an external mechanical stimulus, which can be used for light sources, visualization of stress distribution and mapping of dynamic pressure of the materials. However, using such type of materials as the wearable applications to monitor health problems

To explore new white-light-emitting luminescent materials, a series of multi-color phosphors Ca15(PO4)2(SiO4)6:RE (RE = Eu3+,Sm3+,Dy3+) were successfully prepared by using high temperature solid-state reaction. The calculated electronic structure used by first-principles method predicts that the matrix belongs to a wide bandgap material, which is suitable to achieve the incorporation of various rare

A probe that can efficiently detect harmful Cr(III) and Cr(VI) at the same time is urgently needed. In aqueous solution, Cr(III) and Cr(VI) are in the form of the cation (Cr3+) and anions (CrO42−, HCrO4−, or Cr2O72−), respectively. Owning to their opposite charge, it is a great challenge to develop a two-in-one probe for Cr detection. Here, we report an amino-functionalized YF3:Eu3+ fluorescent probe

A novel red-emitting phosphor NaLaMgWO6 (NLMWO):xMn4+ has been synthesized by a high-temperature solid-state reaction. The samples were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), photoluminescence excitation (PLE) and emission (PL) spectra. The results indicated that the phosphors could be efficiently excited by the near ultraviolet (NUV) and

Trap filling studies of persistent phosphors using visible-light excitation have important implications on both fundamental luminescence research and practical applications. We report here an up-conversion charging (UCC) design of Gd3Ga5O12:Pr3+ persistent phosphor upon excitation with blue lasers. As an example, long-lasting emission from Pr3+ has been achieved in the phosphor after the traps are

Luminescence signals from feldspars are of importance in luminescence dosimetry and dating. The present study attempts a correlation between two specific experimental parameters, such as the lifetime of luminescence components and the dimensionless acceptor density parameter ρ′, as well as the influence of the crystal structure on the luminescence signals. The analysis of the above parameters was completed