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Synthesis and Luminescence properties of Lithium Aluminium Phosphate Glasses Doped with Nd <sup>3+</sup> Ion for Laser Medium
摘要： Nd3+ ion doped lithium aluminium phosphate glasses were synthesized and studied their properties for laser medium application. The density and the refractive index of the glass samples were carried out at the room temperature. The optical and luminescence properties were studied by investigating absorption and NIR emission spectra of the glass samples. The glasses absorbed photons in ultraviolet (UV), visible light (VIS) and near-infrared (NIR) regions are clearly observed from absorption spectra. For the photoluminescence properties, the glass samples showed the strongest emission at 1063 nm when it were excited by 581 nm which assigned to the energy transitions of Nd3+. The three phenomenological Judd-Ofelt parameters (?2, ?4, ?6) were determined from the spectral intensities of absorption band in order to calculate the radiative transition possibility (AR), stimulated emission cross section (σ(?p)) and branching ratio (?R) of the 4F3/2?4I9/2, 4I11/2 and 4I13/2 transitions. From the obtained results the conclusions made about the possibility of using these glasses as laser material.
关键词： luminescence properties,laser medium,lithium aluminium phosphate glasses,Nd3+ ion,Judd-Ofelt parameters
更新于2025-09-19 17:13:59
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CdS quantum dots embedded in PVP: Inorganic phosphate ion sensing in real sample and its antimicrobial activity
摘要： Polyvinyl-pyrrolidone capped spherical cadmium sulphide quantum dots (CdS-PVP QDs), 2–6 nm in size, were developed as a selective turn-on fluorescence nanosensor for monohydrogen phosphate ion (HPO4 2?) in aqueous medium. Fluorescence intensity of CdS-PVP QDs significantly increased with addition of HPO4 2? ions, whereas the other common inorganic ions had very little effect on the fluorescence intensity. The proposed sensor may be efficiently used for the detection of HPO4 2? ions at a low level of concentration up to 213 nM in real urine sample. Cell imaging study indicates that the CdS-PVP QDs are cell permeable and can detect the intracellular distribution of HPO4 2? ions under fluorescence microscope. The CdS-PVP QDs showed considerable activity against Staphylococcus aureus also.
关键词： Chemosensor,CdS,Antimicrobial activity,Cell image,Quantum dots,Phosphate ion sensing
更新于2025-09-19 17:13:59
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Lasing and Gain Properties of Multicomponent Optical Fibers with Heavily Er-Doped Phosphate Core and Silica Cladding
摘要： The most common Er-doped fibres being used today are silica-based. However solubility limit of erbium ions in silica glass restrict shortening of the gain medium in fibre light sources and that way, it limits improving single-frequency fibre lasers, amplifiers and pulsed fibre lasers characteristics. Shortening of a fibre gain medium might be successfully realised by using high-concentration Er-doped phosphate glasses. It was shown that such type of glass allows getting rare-earth ions concentration an order of magnitude higher in comparison with silica glasses without ions clusterization [1]. But significant drawbacks of phosphate fibres are their low corrosion resistance and high losses of its fusion splices with standard silica fibres [2]. The main purpose of our work was an investigation of fibre light sources based on novel multicomponent fibre with 3wt.% Er-doped phosphate core and silica cladding, which take advantages of both phosphate and silica glasses.
关键词： phosphate core,Er-doped fibres,silica cladding,multicomponent fibre,fibre light sources
更新于2025-09-16 10:30:52
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Synthesis and Functionalization of Copper-Doped Indium Phosphate Quantum Dots with Ratiometric Fluorescence
摘要： The doped quantum dots (QDs) that feature dual emission in one nanocrystal and long fluorescence lifetime have gained great interest in biosensing and bioimaging applications. In this work, we report the synthesis and functionalization of copper ion-doped indium phosphate (Cu:InP) QDs that exhibit simultaneous green InP emission and red Cu2+ emission. The oil-soluble QDs were synthesized by adsorbing Cu2+ onto InP core, followed by growing zinc selenide (ZnSe) shell via the successive ion layer adsorption reaction. During the synthesis, fluorescence ratiometry (and resultant multiple fluorescence colors) can be generated by changing either the dopant amount or the shell-growth time, but they act in a different manner: increasing the Cu2+ amount results in quenched InP emission and oppositely improved Cu2+ emission; the increase of shell-growth time leads to continuously improved Cu2+ emission relative to constant InP emission. Further, functionalization of the oil-soluble Cu:InP QDs with dihydrolipoic acid-polyethylene glycol (DHLA-PEG) via ligand exchange produces the water-soluble and biocompatible dual-emission QDs. The PEGylated Cu:InP QDs present desirable charge neutrality and excellent thermal stability and photostability, thereby holding high potential in a diversity of biomedical applications.
关键词： indium phosphate,ratiometric fluorescence,PEGylation,copper doping,Quantum dot
更新于2025-09-16 10:30:52
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Copper Tungstate (CuWO4) Nanoflakes Coupled with Cobalt Phosphate (Co-Pi) for Effective Photoelectrochemical Water Splitting
摘要： Photoelectrochemical (PEC) water splitting provides us a green way to convert and utilize solar energy. In this work, Co-Pi was electrochemically deposited onto CuWO4 nanoflakes (NFs) via a cyclic voltammetry (CV) method to enhance the photocatalytic performance of CuWO4 toward PEC water splitting. The results demonstrated that the photocurrent density as well as the charge-transfer efficiency was improved within the entire potential range. Besides, the CuWO4/Co-Pi exhibited an enhanced stability over the bare CuWO4 in the phosphate buffer solution (pH 7) and an extremely high Faradaic efficiency (ca. 96%). Our work reveals that combination of CuWO4 with Co-Pi is a feasible way to further enhance the performance of CuWO4 photoanode toward PEC OER.
关键词： Photoelectrochemical water splitting,oxygen evolution reaction,copper tungstate,electrochemical cocatalyst,cobalt phosphate
更新于2025-09-16 10:30:52
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Efficient and Stable Inverted Quantum Dot Light-Emitting Diodes Enabled by An Inorganic Copper-Doped Tungsten Phosphate Hole-Injection Layer
摘要： Inorganic interfacial buffer layers have widely been employed for efficient and long lifetime optoelectronic devices due to their high carrier mobility and excellent chemical/thermal stability. In this paper, we developed a solution-processed inorganic tungsten phosphate (TPA) as hole injection layer (HIL) in inverted quantum dot light-emitting diodes (QLEDs) achieving a high external quantum efficiency (EQE) of up to ~20%. Further, the copper ions are doped into tungsten phosphate (Cu:TPA) which leads to an enhancement in hole injection due to increased hole mobility and conductivity of TPA as well as decreased hole injection barrier, enabling better charge balance in QLEDs and lower turn-on voltage from 5 to 2.5 V. Compared with the devices using conventional organic poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) HIL, the half-lifetime of Cu:TPA-based devices is over 3000 h at an initial brightness of 100 cd m-2, almost five-fold operating lifetime enhancement.
关键词： Quantum Dot LEDs,Hole Injection Layer,Copper Doping,Tungsten Phosphate,Electroluminescence
更新于2025-09-16 10:30:52
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Three‐stage kinetics of laser‐induced LiFePO <sub/>4</sub> decomposition
摘要： This paper reports about new insight into a problem of a laser–matter interaction during Raman probing of lithium iron phosphate (LiFePO4), discusses phase transformation kinetics in powder samples, and provides methodological recommendations. LiFePO4 is the second most popular positive electrode material in the global lithium battery industry, but the use of Raman spectroscopy for its structural characterization is hampered by the laser‐induced degradation. The statistical/big‐data approach to Raman spectra measurements is utilized to revise the problem and suggest a simple model of laser‐induced phase transformations in powder LiFePO4. The results are proposed to be used for better understanding of the physics and chemistry of other processes taking place in electrochemical cells, namely, lithiation/delithiation and thermal stability/safety studies. Simple recommendations for nondestructive LiFePO4 characterization by Raman spectroscopy are formulated.
关键词： lithium iron phosphate,nondamaging characterization,statistical Raman spectroscopy,lithium batteries,statistical Raman microscopy
更新于2025-09-12 10:27:22
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A new whole family perovskites quantum dots (CsPbX3, X=Cl, Br, I) phosphate glasses with full spectral emissions
摘要： In this work, pure CsPbCl3, CsPbBr3 and CsPbI3 quantum-dots phosphate glasses were fabricated. Full spectrum (405-690nm) emissions in visible wavelength range are achieved via varying with the ratio of Cl, Br and I halogen elements in the prepared glass host. Compared with the television color standard of the National Television Systems Commission, a wider gamut, ranging from typical purple to red, has discovered in this machine glass system. Furthermore, the photoluminescence properties of quantum dots glasses are detected at high temperature and the exciton binding energy curves are fitted. The fitted results, exciton binding energy increases about six times than previous works, demonstrate that the photoluminescence mainly comes from the recombination of excitons, rather than the recombination of free electrons and holes. Thus, varieties of practical applications, like display devices and the newest light-emitting diodes, are expected to be driven forward.
关键词： Phosphate glasses,CsPbX3 (Cl, Br, I) quantum dots,Full spectrum
更新于2025-09-12 10:27:22
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Impurities in large scale produced Nd-doped phosphate laser glasses. II. Pt ion and Pt inclusion
摘要： Platinum is a special kind of impurity in Nd-doped phosphate laser glasses. Firstly, its presence in the glass depends on the production processes, rather than the purity of the raw materials used. Secondly, there coexist Pt ion and Pt inclusion in the glass, which one is the oxidized and the other is the reduced. The detection for these two kinds of Pt impurities in the large-scale produced Nd-doped phosphate laser glasses can re?ect the control level and stability of the processes. To determine more accurately the content of Pt ion in the glass, a hemi-cyanine dye, instead of SnCl2 previously used, is utilized to color Pt ion solution by dissolving the glass. On the basis of such a new hemi-cyanine spectrophotometric analysis, the factor of proportionality between Pt ion content and its absorption coe?cient at 400 nm is determined and discussed. To avoid the interference from other cations in the multi-cation solution by dissolving the glass, when doing ICP-MS analysis for Pt, a magnetic poly-ionic liquid is synthesized successfully by bonding an ionic liquid to nano-Fe3O4 particles covered by C. Such a new magnetic poly-ionic liquid can adsorb Pt ions with a better selection. The element distribution of Pt, O and P for di?erently sized Pt inclusions in the glass is analyzed by EPMA.
关键词： Pt ion,Pt inclusion,Selective adsorption for Pt ion,EPMA,Spectrophotometry,Nd-Doped phosphate laser glass
更新于2025-09-12 10:27:22
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Effect of up-conversion luminescence in Er3+ doped phosphate glasses for developing Erbium-Doped Fibre Amplifiers (EDFA) and G-LED's
摘要： The (NPbPEr) glasses of the composition (20-x) Na2SO4-20PbO-60P2O5-xEr2O3 (x= 0.1, 0.3, 0.5, 0.7, 1.0 mol %) are synthesized by melt quenching process. The basic characterization studies like XRD and EDS have confirmed amorphous nature and contents of the samples. The spectroscopic studies viz., optical absorption, photoluminescence (PL) and decay profiles were carried out. The PL spectra exhibited an intense sharp green emission peak at 544 nm due to 4S3/2 → 4I15/2 transition of Er3+ ions both in down-conversion (DC, l exc = 377 nm) and up-conversion (UC, l exc = 977 nm) PL spectra. The spectra also exhibited a broad intense NIR band at 1532 nm ascribed to 4I13/2→4I15/2 transition of Er3+ ions at l exc = 977 nm. The analysis of the spectra indicated 0.5 mol% of Er2O3 is the optimal concentration for achieving maximal PL output both in the green and in NIR regions. The CIE color coordinates and the corresponding CCT (K) values were estimated from both UC and DC emission spectra. Overall analysis of the results suggested that the investigated glasses are potential candidates for getting intense green light emission and are quite suitable as optical fibre amplifiers in the green and NIR (around 1.5 m m) regions.
关键词： Er3+ ions,Green and NIR emission,sodium sulfo-phosphate glasses
更新于2025-09-12 10:27:22