Fluorotellurite glass ceramics (GCs) are promising photonic materials owing to their unique characteristic of integration of low cut-off phonon energy of fluorides and the high refractive index of tellurite glasses. Here, appropriate heat treatment to obtain the transparent GC from the parent glass (PG) of TeO2-Al2O3-NaF-CaF2-YbF3-ErF3 was established. The XRD, TEM, and spectroscopy techniques were

We investigate the radiation effects of 1907 MeV Ta ions on the static and dynamic characteristics of 850 nm high-speed vertical cavity surface emitting lasers (VCSELs). The threshold current and slope efficiency are found to be degraded. However, appropriate ion fluence irradiation can improve the modulation bandwidth. The maximum 3 dB frequency is increased to 14.02 GHz from 13 GHz at a fluence of

This work presents the results of determining the temperature of plasma electrons formed in conditions of hydrodynamic luminescence – the light emission of a fluid during a flow in a narrow dielectric channel. Argon was added to the water-air mixture to measure the electron temperature of the medium, and the analysis of temperature was provided by measuring the intensity of argon lines. The obtained

Novel Eu-doped NaBaB9O15 phosphors were successfully prepared by a traditional solid-phase method in air. It is found that Eu3+ ions can be reduced to Eu2+ spontaneously even in a non-reducing atmosphere due to the charge compensation and the rigid three-dimensional structure of the NaBaB9O15 matrix. Eu2+/Eu3+ co-doped NaBaB9O15 phosphors exhibit blue/red dual-band emission in the 370-450 nm and 580-750

In this article, a series of Eu-doped oxynitride phosphate glass samples are prepared. It is shown that the photoluminescence of Eu can be tuned through different alkaline earth metal ions (M2+). The luminous intensity of Eu2+ decreases with increasing ionic radius in the order of Mg＜Ca＜Sr＜Ba. And with the increased mismatch degree of radius between M2+ and Eu ions, the luminescence of Eu3+ gains intensity

Scintillators based on Ce-doped garnets are regularly co-doped with Mg2+ or Ca2+ to form Ce ions in 4+ state and reduce undesired afterglow. However overly high Ce4+ concentration leads to poor light yield performance. In order to understand the reason for variation in luminescence efficiency of Ce3+- and Ce4+-doped garnets we investigate the differences in energy conversion processes in complex L

A coplanar donor-acceptor (D-A) structure in single crystal is directly observed for TICT-Type DPA-PYZ, which corresponds to a coplanar localized excited (LE) state. The conversion between coplanar LE and twisted intramolecular charge transfer (TICT) excited state in the solid state can be achieved through the change of the D-A twist angle between ∼0o and ∼30o during grinding, heating and solvent fumigation

Van der Waals layered materials have attracted much attention due to their unique properties and potential applications in (photoelectric) electronic devices. In this paper, a fast and economical method for growing high quality α-HgI2 single crystal is reported, which provides a feasible idea for preparing monolayer or two-dimensional α-HgI2. According to our research, the low-temperature (80 K) photoluminescence

In this paper, ion-beam-induced luminescence (IBIL) spectra of raw ZrO2 irradiated with 2 MeV H+ ions and photoluminescence (PL) spectra of annealed (200, 500 and 800 °C in air, nitrogen or oxygen) ZrO2 were investigated. The luminescence intensity decreased with increasing fluence, which indicated that the concentration of luminescence centers decreased during irradiation. The PL spectral results

In this paper, a novel long afterglow green luminescent material of Ga4GeO8: Tb3+ has been successfully synthesized by high-temperature solid-state method. Ga4GeO8 showed long afterglow blue emission peaked at 490 nm. When Tb3+ ions were introduced into the host, the strong long afterglow green emission from the f-f transition of Tb3+ appeared and the blue afterglow emission of the host disappeared

In this work, we present the results of a unique study that aims to detect the degradation of the individual silver nanoparticles peak in the photoluminescence spectra of the Ag/Ag2O composites synthesized by treating silver thin films manufactured by thermal evaporation method with oxygen plasma afterglow. The analysis of the spectroscopic data yielded an interesting finding that, the individual silver

With the fast development of GaN blue laser diode, Dy3+ doped laser crystals are receiving renewed interests due to their potential yellow laser emission under GaN laser diode pumping. In this study, Dy:YAG and Dy,Tb:YAG with high quality have been grown successfully with Czochralski method. Their spectroscopic properties as well as the energy transfer mechanism between Dy3+ and Tb3+ were discussed

Upconversion luminescent (UCL) materials have unique advantages in multicolor bio-imaging and anti-counterfeiting. Bismuth-based oxide possess merits of stable chemical structure, low cost, and corrosion resistance. In this paper, the Bi2Ti2O7:Yb3+/Eu3+ nanofibers were successfully prepared via electrospinning process. The length of the obtained nanofibers is several hundred microns and the diameter

The solid-state lasers provide an attractive approach to enhance the laser performance benefitting from significant improvements in both thermo-optic and spectroscopic properties of the gain mediums under cryogenic temperature. We have systematically investigated the structure, thermal and spectral properties of Nd:YAlO3 (Nd:YAP) in the temperature range of 77 to 300 K. We found for the first time

A series of Eu2+/Cr3+ co-doped BaAl12O19 phosphor was synthesized by traditional high temperature solid stated method, and the temperature-sensitive characteristic of the phosphor was researched. Due to the temperature sensitivity of the fluorescence lifetime of Cr3+, the thermometry based on fluorescence lifetime can be realized. Furthermore, the emissions of Eu2+ ion and Cr3+ ion can be well separated

We prepared (C6H5C2H4NH3)2Pb1-xCdxBr4 single crystals with four different values of x (x = 0.05, 0.1, 0.25, and 0.5) and investigated their photoluminescence (PL) and scintillation properties. All the samples showed the exciton luminescence peaking at 410 and 440 nm. The x = 0.05, 0.1, 0.25, and 0.5 samples exhibited the PL quantum yields of 20.2, 24.8, 29.7, and 27.8% including the typical errors

A series of far-red-emitting Ca2M3(SiO4)2(PO4)O (M = La, Y) (CMSPO):xEu3+ (x = 0.05, 0.10, 0.20, 0.30, 0.40 and 0.50) phosphors were successfully synthesized by high-temperature solid-phase reaction. The fabricated samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), fourier transform infrared (FT-IR), ultraviolet–visible diffuse reflectance (UV–Vis DR)

Sr3LiSbO6:x%Mn4+, y%Ca2+ (x = 0.1, 0.2, 0.3, 0.4, 0.5, x: y = 1: 1.5) phosphors have been successfully synthesized via conventional high-temperature solid-state reaction method. The phosphor samples were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), photoluminescence spectra, ultraviolet–visible (UV–vis) absorption spectra, Raman spectra and decay curves as well as

We report a new Dy3+-doped Ga2S3-Sb2S3-La2S3 (GSLS) chalcogenide glass for mid-infrared (mid-IR) laser applications. With the addition of La2S3 into the previously studied Ga2S3-Sb2S3 glass, the thermal stability of the base glass is significantly enhanced. The glass with the composition 20Ga2S3-75Sb2S3-5La2S3 (mol.%) shows the best thermal stability for fiber drawing, and the glass can be doped with

A comparative analysis of the spectroscopic characteristics of a large number of benzoates, nitro-, methoxy-, amino- and hydroxybenzoates of europium and terbium including those with an ancillary 1,10-phenanthroline ligand is presented. The effect of the stepwise introduction of substituents in the benzoate anion on the Eu3+ and Tb3+ luminescence excitation spectra and luminescence intensity is discussed

The energy band structure of CeX3 (X = Cl, Br, I) crystals have been calculated by the methods of density functional theory using projector augmented waves and hybrid functional of the exchange-correlation interaction PBE0. The valence bands of the investigated crystals are confirmed to be formed by halogen np-states, and the 5d conduction bands formed by 5d1 and 5d2 Ce3+ subbands with strongly different

Mn doped two-dimensional (2D) layered perovskites, are becoming excellent candidates as red phosphor because of their high quantum yields (QY) and enhanced stability. However, these Mn doped 2D layered perovskites can only be excited by the near UV light, which largely limits the development of perovskites. Herein, blue-excitable Mn-doped PEA2(Pb/Mn)(Br/I)4 PQDs are synthesized from anion exchange

Lead halide perovskite CsPbBr3 nanocrystals (NCs) have attracted great interest in recent years owing to their excellent properties such as strong light absorption, high photoluminescence quantum yield (PLQY), good wavelength tunability, and narrow FWHM. However, their instability is still a bottleneck for their potential application. In this work, a pseudo-peritectic method, which is a peritectic

Phosphor-converted white-light-emitting diodes (PC-WLEDs) are the main devices behind solid-state lighting (SSL) for both indoor and outdoor lighting, or backlight of liquid-crystal displays (LCD). Nonetheless, despite the current maturity of such devices, some concerns on spectral distribution, reliability, and color qualities of WLEDs for lighting, or even the enhancement of the color gamut of backlight

Poor stability as an essential issue of metal halide perovskites (MHPs), limits their further applications in displaying and lighting. Among multicolor luminous MHPs, the development of blue luminous perovskite lags far behind that of red and green emission. Herein, a “MAPbBrxCl3-x quantum dots (QDs) in Pb(OH)Br” strategy is proposed, fabricating stable MAPbBrxCl3-x@Pb(OH)Br with the emission wavelength

Controlling the emission wavelength by the quantum confinement or the size effect of silicon quantum dots (Si QDs) has a limitation in that it can be only approximately 600 nm or above. To overcome this limitation, in the recent decade, numerous studies have been conducted for reproducing the entire visible range from blue to red from Si QDs by their surface functionalization. In this study, we fabricated

In current study Neodymium doped phosphate glasses were prepared and subsequently the Physical and luminescence properties of these glasses were thoroughly analyzed. In total, eleven absorption bands centered at 352, 431, 474, 512, 526, 583, 626, 683, 746, 803 and 875 nm were observed in absorption spectra. Similarly, the emission spectra of the prepared glasses recorded with 804 nm excitation show

Lanthanide ions doped upconversion luminescence materials have attracted great attention due to their potential applications in anti-counterfeiting, volumetric display, optical multiplexing, and bioimaging. Previous studies showed that it is possible to control transient states of lanthanide ions, enabling a large luminescence color gamut in one fixed composition upconversion material. However, the

Most recently, it has been demonstrated that the use of 3P0–3H4/1D2-3H4 intensity ratio of Pr3+ transitions is potentially beneficial to luminescence thermometry. In this study, a study is conducted of (Ba1-xSrx)TiO3:0.5%:Pr3+ phosphors following Sr2+ concentrations range (x = 0–0.5) in terms of luminescence thermometry. Besides, an investigation is carried out into thermoluminescence properties, based

We report a detailed analysis of both structural characterization and high-resolution spectroscopic properties of Nd3+-doped YPO4 and LuPO4 in the form of nano/micro -powders. LuPO4, like YPO4 crystalizes in a zircon-type tetragonal system. Nd3+ ion in substitution of Lu3+ or Y3+ cations occupies the main symmetry site D2d and the presence of additional components in the spectra may indicate the presence

Computational and experimental methodology is employed to study optical properties in Eu-doped BaAl2O4 phosphors. The symmetry and detailed geometry of the Eu-dopant site, predicted by atomistic simulation, are used to calculate the crystal field parameters and the intensity parameters (Ω2 and Ω4) based on a Judd-Ofelt approach to the Eu3+ ion. The phenomenological intensity parameters are obtained

Pr3+:NaY(MoO4)2 crystals with dopant concentration from 0.1 to 1.5 mol% have been successfully grown by the vertical Bridgman method using spontaneous crystallization. The as-grown Pr3+-doped NaY(MoO4)2 crystals presented black-green color, and the annealed crystal samples presented transparency with faint green coloration. The mechanisms of eliminating color centers by thermal annealing are explained

A series of new double perovskite structure CaLaMgTaO6: Bi3+, Eu3+ phosphors were synthesized by high-temperature solid-phase method. The crystal structure, luminescence characteristics and temperature sensing performance have been systematically studied. The substitution rule of Bi3+ in CLMT and its luminescence characteristics are described. The decay curve of Bi3+ further proves the existence of

Recently, the investigation of Mn4+ doped phosphors with deep-red emission is one of hot research topics because that this type of phosphors has potential applications in phosphor converted white light emitting diodes (pc-WLEDs). In this article, we designed and synthesized Bi3+/Mn4+ doped Ca2YZr2Al3O12 phosphors. In addition, we investigated their luminescence performances to show the potential applications

High optical quality Dy3+-doped CaLaGa3O7 (abbreviated as Dy: CLGO below) crystal was grown successfully by the Czochralski technique along the (0 0 1) orientation. The lattice parameters of the as-grown crystal were obtained by Rietveld refinement to its XRD pattern. The electronic structures including band structure and density of state (DOS) were calculated by using first-principles calculations

High-quality Dy:PbWO4 crystal has been successfully grown by the Bridgman method. Fluorescence properties of the grown crystal at the yellow-light region were discussed. The absorption cross-section of Dy3+ ions at 454 nm was calculated to be 0.142×10−20 cm2, which corresponded to the transition from 6H15/2 to 4I15/2 level. Based on Judd-Ofelt theory, the J-O intensity parameters Ωt and the emission

Semiconductor ZnS quantum dots (QDs) co-doped with Eu3+ and Ce3+ were synthesized by the chemical method. The optical properties of the samples were characterized by absorption spectroscopy, photoluminescence (PL) spectroscopy and PL-decay lifetime. X-ray diffraction revealed that the QDs had a zincblende structure and a particle size of about 3 nm. The presence of Eu3+ and Ce3+ ions in the samples

YVO4:Eu3+ phosphors have been subject of studies in recent years because of their intense luminescence, their various applications in lighting devices and, recently, because of their potential use in biological probes resulting from their low toxicity. Achieving YVO4:Eu3+ nanophosphors with size less than 20 nm has been a difficult task due to the annealing treatments used during their synthesis. In

Cryolite was considered to be an ideal up-conversion host material due to its low phonon energy, which can effectively suppress the radiation-free transition process of excited state energy levels. In the present paper, a novel up-conversion material K3YF6:Ho3+, Yb3+ with cryolite structure was prepared successfully using a high-temperature solid state method. The up-conversion luminescence properties

A high-quality 2-inch-diameter Nd3+, Ce3+ co-doped Y3Al5O12 (YAG) crystal was successfully grown by the Czochralski (CZ) method. During crystal growth, a modified temperature field was applied to prevent defects in the crystal. The spectrum of the sample showed strong absorption peaks corresponding to Nd3+ and Ce3+ ions. The effect of Ce3+ codoping on the photoluminescence of Nd3+ was investigated

Zn contamination of InGaN/GaN multiple quantum well (MQW) structure from unknown source is found. A model describing concentration profile of Zn acceptor impurity in InGaN/GaN MQW structure is introduced and compared to measured values. The model is based on difference among the formation energies of acceptors in the InGaN quantum wells. A nice correlation of the model and experimental data helps to

In this paper, the Gd2O3: Yb3+/Er3+/Bi3+ phosphors are prepared by sol-gel method. The upconversion (UC) emission spectra of Gd2O3:Yb3+/Er3+/Bi3+ phosphors are measured under 980 nm excitation. The UC emission intensity can be enhanced by the codoped Bi3+ ions. The temperature sensing performance is investigated with the fluorescence intensity ratio(FIR) technology based on thermal coupled levels of