A new approach for controlling intersubband transitions and optical properties of coaxial cylindrical quantum well is proposed. Considering the correct dressing effect for the confinement potential, the new ultra-wide tuning mechanism is based on the variation of quasibound states with the intensity of long-wavelength laser field. By means of the finite difference method, the results provide a new

The aim of this study is to make clear the photoluminescence (PL) properties of Mn4+-activated phosphors under the application of hydrostatic pressure (p). A determination of the excited-state zero-phonon line (ZPL) energies in the 3d3-configuration ions is possible from a set of Racah (B and C) and crystal-field splitting parameters (Dq), and vice versa. It has been demonstrated that detailed analyses

As a representative of the third-generation semiconductors, ZnO has great development potential in the fields of optics and electricity, so the measurement on its electrical properties is quite important. Here, we try to extract the carrier concentration and mobility of ZnO by mid-infrared reflectance spectroscopy. Considering that the longitudinal optical phonon-plasmon coupling (LOPC) mode formed

The temperature-dependent time-resolved spectroscopies are employed to investigate the hot carrier characteristics in MAPbBr3 nanocrystals (NCs). Simultaneously, the absorption and photoluminescence data exhibits that MAPbBr3 NCs pass through cubic phase and tetragonal phase in turn as the temperature drops. As the phase transition from the cubic phase to the tetragonal phase, the band gap narrows

Applications that utilize scintillation detectors at low temperatures are growing in number. Many of these require materials with high light yield and a fast response. Here we report on the low-temperature characterisation of ZnSe doped with Al or Te, respectively. The X-ray luminescence and decay curves were measured over the 77–295 K temperature range, and alpha particle excitation was used to examine

Although silicon photonics has made great progress, there are still challenges to realization of modules or devices such as integrated light sources and amplifiers because of the indirect band gap nature of silicon. In this paper, we report a high concentration Er3+-doped La2O3–Ga2O3 glass for Er3+-doped waveguide amplifier (EDWA). The results show the xEr2O3–44La2O3-(56-x)Ga2O3 glasses prepared by

A new phosphor Y2BaAl4SiO12: Ce3+, Cr3+ yielding much efficient energy transfer from Ce3+ to Cr3+ and strongly emitting deep-far red emission under blue LED excitation has been reported. The doping of Ce3+ into Y2BaAl4SiO12: Cr3+ has greatly enhanced the excitation at blue region with increasing deep-far red emission more than three times. It is highly noticeable that an efficient energy transfer has

Green photosynthetic pigments play a major role in light-harvesting for biological substances and bio-mimetic strategy will provide a structural or functional model for natural antenna system. But the precise supramolecular structure of chlorosome has still not been clearly identified and the simulation of its function with new alternatives will be a real challenge. It has been well accepted that blue

Novel trivalent europium activated single-phase red-emitting Cs2Ba(MoO4)2 (named as CBMO) phosphors were first prepared through high-temperature solid-state reaction. Under 396 nm excitation, the CBMO:15 mol%Eu3+ phosphor exhibited a strong red emission at 614 nm due to the typical 5D0→7F2 transition. The optimum concentration of Eu3+ ions was 15 mol%, and critical distance (Rc) was 14.78 Å. The Commission

Nearly two orders of magnitude decrease of the visible emission of GdF3:ErF3 nanoparticles under 797 nm laser excitation is experimentally observed with an external magnetic field (MF) up to about 1.3 T at room temperature. Transmission measurement of the excitation laser indicates that the MF induced luminescence suppression in the prepared nanoparticles is mainly due to the decreased absorption of

A 5 at % Er: LuYO3 crystal was grown by optical floating zone method for the first time. The absorption section at 980 nm is 0.35×10−20cm2 with FWHM of 19 nm. The intensity parameters Ωi(i=2,4,6) and the radiative transition probability, fluorescence branching ratio and lifetime of energy level transition from 4I11/2 to 4I13/2 and 4I13/2 to 4I15/2 of Er ion in Er: LuYO3 crystal were calculated. The

TL dose dependences were simulated following the semi-localized transitions (SLT) model and the model with cluster defects which contain TL-active electron traps, luminescence centers and deep hole traps. Monte-Carlo method was used to calculate cluster occupancy at the irradiation and relaxation stages. At the heating stage, TL yield was calculated with Monte-Carlo method and with the proposed analytical

Potassium Zinc Alumino Borosilicate (KZABS) glasses co-doped with Dy3+/Tb3+ ions have been synthesized by employing a sudden melt quenching technique. To check the luminescence behavior, the as prepared glasses were characterized by employing spectroscopic tools like photoluminescence (PL) excitation and emission, temperature dependent PL and PL decay to see the energy transfer between Dy3+ and Tb3+

Tm3+-doped La2CaB10O19 (Tm3+: LCB) crystal with dimensions of 40 × 16 × 14 mm3 has been grown by the top-seeded solution growth (TSSG) method. At room temperature, the absorption spectrum in the wavelength range of 190–2000 nm and emission spectrum under the excitation of 466 nm were measured by using (110) oriented crystal wafers. According to the Judd−Ofelt theory, the fundamental spectral parameters

Eu3+ has been successfully incorporated in multisites of cubic CaCO3 nanocrystals via carbonation method. X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflection spectra (DRS) and photoluminescence (PL) spectroscopy were utilized to characterize the properties of all samples. PL spectra show that the intensity of CaCO3:0.02Eu3+

We have measured room temperature and low temperature luminescence spectra of Eu3+ in SrAl2O4:Eu3+/2+. The powder samples were synthesized in reducing atmosphere above 1200 °C, cooled down to room temperature in the same atmosphere, and heated again to 750 °C in air. The analysis of the emission spectra of Eu3+ showed the presence of multiple sites for this ion, revealing that many different charge

Cesium copper iodide compound (Cs3Cu2I5) is in a blossoming status owing to its advantages of high photoluminescence quantum yield (PL QY), non-toxicity and low-cost, which holds great potential in optoelectronic applications. The issue of long-term stability of Cs3Cu2I5 should be concerned before its commercialization. Herein, we fabricate ultra-stable Cs3Cu2I5 powder by adopting Na + ions doping

The development of phosphor-converted white light-emitting diodes (w-LEDs) is in the ascendant. However, it is a constant pursuit to find the most suitable visible light emitting phosphors. Trivalent Bi ion is a kind of activator ion with a wide range of luminescence (from ultraviolet to visible). It has important application value for the study of luminescent properties of Bi3+ activated phosphors

By combining the GGA + U method, the magnetic and optical properties of (In, Mn) co-doped 4H–SiC and (In, 2Mn) co-doped 4H–SiC systems are calculated by first principles. The results show that the local magnetic moment of the (In, Mn) co-doped 4H–SiC system is 5.14 μB. And (In, 2Mn) co-doped 4H–SiC system can get the most stable ferromagnetic state, in which the energy difference △ EFM is 172.2 meV

This study intends to use the luminescence of trivalent europium, as a probe, to extract additional data on structural features detected previously in mixed metaphosphate glasses. To this end, five key compositions were doped with a constant amount of Eu 2 O 3 and synthesized using the melt quenching technique. Raman spectroscopy shows that the structure of the doped samples is in the vicinity of the

The paper is devoted to the study of the excitation capture efficiency of rare-earth ions emission levels upon electron-beam irradiation in well-known scintillation materials. The method is based on cathodoluminescent rise rate dependence on the electron beam current. Electron probe microanalysis was used to determine the composition of the samples. The technique allowed us to quantify the excitation

Thermally and optically stimulated luminescence signals from feldspars have been the subject of numerous experimental and modeling studies, due to the importance of these signals in luminescence dosimetry and luminescence dating. Despite these extensive previous studies, there are no standardized computerized deconvolution methods for analyzing these signals in the literature. In this paper we present

In this work, Er3+/Yb3+ co-doped 40Bi2O3-30GeO2-15Ga2O3-15Na2O glass was papered by melt-quenching method. The thermal properties and spectroscopic were studied. The glass has good thermal stability and the maximum phonon energy is 750 cm−1, which is benefited for 1.53 μm emission. According to the J-O theory and absorption spectra, the J-O intensity parameters were calculated, the spectral quality

A kind of novel composite nanophosphor consisting of corroded SiO2 and La2MoO6:0.14Eu3+ (abbreviated as LMO:0.14Eu3+) had been successfully synthesized by hydrothermal approach followed by calcination. The mic-morphology of the composite material was observed by FE-SEM. The positive effect of corroded SiO2 on the luminescence performance of phosphor had been studied in detail. The SiO2 corroded by

Large size single crystals of NaCl:Ce3+,XPr3+ (with X = 0.0, 0.002, 0.005, 0.008, 0.02, 0.05 and 0.08) were successfully grown by the melt (Czochralski) method and characterized structurally and optically. X-ray diffraction analysis has revealed the incorporation of Ce3+ and Pr3+ ions into the NaCl matrix and the creation of vacancy centers (VʺNa) and positive defects (CeNa●● and PrNa●●) to keep the

The dual-functional optical materials that can achieve accurate temperature sensing and effective photothermal conversion have aroused great concern in biomedical and industrial fields. However, the lack of optical functional materials limits the photothermal devices in practical applications. In this work, the pure monoclinic Ho3+/Yb3+ codoped La2Ti2O7 microcrystals have been successfully synthesized

In this work, Random laser (RL) and stimulated Raman scattering (SRS) are investigated using Rhodamine 6G ethanol solution in poly (melamine formaldehyde) foam with micro/nano-sized porous structures. At low dye concentration, the RL containing multiple discrete narrow peaks is observed in both its natural and compressed state of foam. It is found that the cavity length in the compressed state is significantly

In this paper, Lu3+ ions (<10 at. %) were doped into Ba2SiO4:Eu2+ phosphors by the high temperature solid-state reaction. The effects of Lu3+ ions on the structure and photoluminescent properties were investigated in detail. Photoluminescence spectra indicate that no energy transfer between Lu3+ ions and Eu2+ ions, while Eu2+ green luminescence intensity increases with Lu3+ dopant concentration increasing

The researches on cyan phosphors those can be effectively excited by near-ultraviolet (NUV) light are being hot topics lately because that they have potential applications in phosphor converted white light emitting diodes (pc-WLEDs) based on the NUV chips. In this work, Bi3+/Dy3+ doped Ca2LaTaO6 phosphors were prepared through a solid state reaction procedure, and their luminescence characteristics

Mn4+-activated (oxy)fluoride-based red phosphors have received extensive attention. In this work, a phase transformation from K2NbF7 to K3HF2NbOF5 was successfully achieved by stoichiometric control during coprecipitation process, resulting in a novel red phosphor K3HF2NbOF5:Mn4+ with narrow-band emission. A systematic study was carried out on its crystal structure and luminescent properties. By introducing

Bottom-up methods allowing the preparation of carbon dots (CDs) with favorable attributes are highly desirable. Herein, we report the mild bottom-up synthesis of CDs towards temperature sensing. Five kinds of CDs with blue or green fluorescence were synthesized in water or tetrahydrofuran (THF) under moderate conditions (normal pressure, 50~95 °C), with use of carbonyl compounds as carbon sources,

In this paper, we have investigated the room temperature photoluminescence spectra of Cu/Al nanoparticles coated ZnO nanorods for optoelectronic applications. Pulsed laser deposition technique was used to cote the metal nanoparticles on ZnO nanorods. We have done a detailed investigation on photoluminescence spectra of Cu/Al coated ZnO nanorods where we have observed significant enhancement of near

Ortho-phosphates according to the composition ABPO4 (A = Li+, Na+, and K+; B = Mg2+, Ca2+, Sr2+, and Ba2+) are often investigated and used as hosts for Pr3+ activated phosphors or scintillators. In this work, the characterisation as well as the synthesis of microcrystalline Na1+xCa1-2xPO4:Pr3+x is discussed. In order to ensure that the investigated samples are single phase compounds, X-ray powder diffraction