Song Ye

Tongji University · College of Material Science and Engineering

In this research, upconversion nanocrystals incorporated with MOR zeolite composites were synthesized using the desilicated MOR zeolite as a host for the in situ growth of NaREF4 (RE = Y, Gd) Yb/Er nanocrystals. The structure and morphology of the composites were studied with XRD, XPS, and TEM measurements, and the spectral studies indicated that t...

The combination of upconversion nanoparticles (UCNPs) with porous zeolites could enable the development of multifunctional composites and extend their optical applications in sensing, detection and biomedical monitoring. Herein, a series of high luminescent UCNPs@Zeolites nano-micro composites were constructed via the in situ growth strategy, by ta...

Silver nanoclusters (Ag NCs) are nanoscale aggregates that possess molecular-like discrete energy levels, resulting in electronic configuration-dependent tunable luminescence spanning the entire visible range. Benefiting from the efficient ion exchange capacity, nanometer dimensional cages, and high thermal and chemical stabilities, zeolites have b...

Degradation behaviour of bioactive glass (bioglass) is one of the most important factors affecting bone repair, because an excellent and controllable degradation rate can match the rate of new bone formation. In this research, the derived borosilicate bioglasses based on the 6Na2O-8K2O-8MgO-22CaO-18B2O3-54SiO2-2P2O5 component were synthesized. The...

Faujasite zeolites with a regular micropore and mesopore structure have been considered desirable scaffolds to stabilize luminescent silver nanoclusters (Ag CLs), while turning of the emission properties of the confined Ag CLs is still under investigation. In this study, the desilicated and dealuminated faujasite zeolites were first prepared to mod...

Rare earth ions doped core-shell thermometers exhibit improved up-conversion emission behaviors, while the thermal sensitivity is not higher than the corresponding core-only structured luminescent thermometers via the thermal coupled levels based luminescence intensity ratio (LIR) technique. In this work, the core-only β-NaYF4: 16Yb³⁺, 4Er³⁺ (C–4Er...

Enabling the drug delivery systems with drug release monitoring function is of essential importance to enhance therapeutic effectiveness. Herein, we took a ship-in-a-bottle synthesis strategy to construct the upconversion nanocrystal and zeolite compounded drug delivery system with real-time monitoring function, by using desilicated ZSM-5 zeolite a...

In this study, an optical fiber temperature sensor based on up-conversion luminescence (UCL) is proposed. The core part is a new plan of the sensing unit, which is constructed with UCL materials of ${\rm NaYF}_4$ N a Y F 4 : ${{\rm Yb}^{3 +}}$ Y b 3 + , ${{\rm Er}^{3 +}}$ E r 3 + nanocrystals by fiber fusion technology to achieve a wide range of te...

In this research, the Linde Type A (LTA) zeolites were firstly synthesized with hydrothermal method and then the Ag⁺ ions were introduced into LTA through Ag⁺-Na⁺ exchange process, and the luminescent Ag3ⁿ⁺ nanoclusters can be formed inside the sodalite cages under heat treatment at 300–700 °C, which exhibited yellow-greenish emission under UV exci...

Injectable bone cement combined with minimally invasive surgery has attracted much attention in recent years due to its rheological properties directly influencing its convenience and effectiveness in clinical applications. This study systematically investigates the influence of particle size distribution on the rheological, injectability, and anti...

In this study, a new processing design of an optical fiber cryogenic temperature sensor (OFCTS) is presented. The sensing unit is constituted by NaYF4:Yb³⁺, Er³⁺@NaYF4 core-shell upconversion nanocrystals-polymethyl methacrylate (UCNCs-PMMA) nanocomposites. The coupling is achieved by fiber fusion in the embodiment. The relative sensitivity of the...

Faujasite (FAU) type zeolite is built from sodalite cages that joined by oxygen bridges between the hexagonal faces, and is characteristic of high cation exchange capacity and thermal stability. In this research, the FAU-NaX zeolite with Na/Si/Al molar ratio of 4.08:1.4:1.0 was prepared with template-free hydrothermal method and then confirmed with...

Molecular-like silver nanoclusters (ML-Ag NCs) with size dependent tunable luminescence properties and high-quantum yield has been explored as a new type of sensitizer for rare earth (RE) ions in glasses recently. In this research, the borosilicate glasses containing ML-Ag NCs and RE³⁺ (RE = Sm, Eu, Tb) ions were prepared with melt-quenching method...

Small size optical-magnetic bifunctional upconversion nanoparticles (UCNPs) that can be effectively triggered by 808 nm exhibit distinct advantages of improved tissue penetrating depth, minimized overheating effect, possible for multimodal imaging and high clearance rate, which therefore are considered as desirable candidates for bioapplications. I...

The ability to increase the emission intensity and turn the emission color of upconversion nanocrystals (NCs) will greatly enhance their application scopes. In this research, the sub-10 nm pure β-NaYF 4 : Yb ³⁺ /Tm ³⁺ /Ho ³⁺ core NCs were prepared by using sodium oleate (NaOA) as sodium source instead of the traditional NaOH, based on which the β-N...

A novel injectable bone cement was prepared using sol-gel derived borosilicate bioactive glass nanoparticles as a solid phase and sodium alginate solution as a liquid phase. The gelation reaction of the alginate was modulated by Ca²⁺ ions released from the borosilicate glass phase, which in turn greatly depended on the boron content of the borosili...

A new type of fluorescence fiber optic temperature sensor based on the detection of fluorescence intensity ratio (FIR) is proposed. Benefited from the temperature-dependent characteristic of upconversion luminescence (UCL), it can be applied in fiber optic temperature sensors. Rare earth doped upconversion nanoparticles (UCNPs) NaYF4:Er³⁺,Yb³⁺ are...

Borosilicate glasses containing Ag nanoclusters (Ag NCs), Eu³⁺ and Yb³⁺ were prepared with the melt-quenching method, in which an efficient energy transfer from Ag NCs to Yb³⁺ can be realized. Unlike the previous reports in which Eu³⁺ act as either sensitizer or luminescence center, the role of Eu³⁺ in this system is to promote the formation of Ag...

The micro-mesoporous composite phase structure of the analcime and the glass phase was successfully synthesized at 200∘C by using hydrothermal method, in which the soda–lime–silica glass was used as the silica source and the sodium hydroxide and aluminum oxide were used as additive. The TEM and SEM results showed that the obtained rod-shaped analci...

In this research, the Ag nanoclusters (Ag NCs) dispersed borosilicate glasses with the absence and presence of LiF were prepared by the melt-quenching method. The absorption, photoluminescence, FTIR results indicated that the doping of LiF plays dual effects on the size evaluation of Ag species: the introduction of F⁻ and Li⁺ can promote and restra...

In this work, the monodisperse spherical pure β-NaYF4:Yb³⁺,Er³⁺ core NCs with average size of 7.2 nm were synthesized by using NaOA as sodium source instead of the conventional NaOH, based on which the sub-20 nm β-NaYF4:Yb³⁺,Er³⁺@NaGdF4 core-shell NCs with magnetic-optical bifunctional properties were successfully obtained with seed-mediated growth...

In this research, series of Ag nanoclusters (Ag NCs) contained oxyfluoride glasses were prepared by using the melt quenching method, in which the REF3 (RE= Y, La and Gd) were selected as dopants to control their size distribution. The absorption, steady and time-resolved PL spectra were carried to investigate the size dependent luminescence propert...

A novel injectable borate glass bone cement (BGBC) was prepared by using citric acid-β glycerophosphate-chitosan solution as setting solution. The effect of citric acid (H3Cit) concentration (0.1, 0.2 and 0.4 g/mL) on the properties of BGBC was investigated by using vicat apparatus, universal testing machine, XRD, FTIR, and SEM-EDS measurements. Th...

Yb³⁺ and Er³⁺ ions co-doped NaYF4 nanocrystals were synthesized with different amounts of NaOH via oleic acid (OA)-assisted hydrothermal process. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and photoluminescence spectra were used to characterize...

Borate bioactive glass (BBG) is a promising candidate material for bone tissue engineering. Mostly, it was applied in the form of scaffolds and granules. Till now, little work has been done to investigate the fabrication of porous borate bioactive glass cement (BBGC). In this work, we prepared an injectable macroporous BBGC via gas-foaming method,...

Oxyfluoride glasses containing Ag species (including Ag⁺ ions, Ag nanoclusters and Ag nanoparticles) and Sm3 + ions were prepared by melt-quenching method. The structure and luminescence properties were studied by absorption spectra, transmission electron microscopy, as well as steady and time-resolved photoluminescence spectra. The experimental re...

In this research, the EuF3-AgNO3 co-doped oxyfluoride glasses with varied fluoride content and monovalence cation were prepared by melt-quenching method. The optical absorption, photoluminescence and TEM measurement results indicated that the evolution of Ag species (including Ag+, molecular-like Ag clusters and Ag nanoparticles) is very sensitive...

ZnO quantum dots (QDs) with tunable size and photoluminescence can be achieved simply by controlling their growth during the sol-gel synthesis process. However, the role of alkali metal hydroxide MOH (M = Li, Na or K) as the reactant in the growth of ZnO QDs is still controversial. In this work, we carried out a comprehensive study on the growth of...

A novel composite drug carrier with excellent sustained and pH-sensitive release performance was prepared by mixing hollow hydroxyapatite (HA) microspheres and chitosan solution with pH-sensitive characteristics. The hollow HA microspheres with mesopores filled on their multilayered spherical shell were obtained by converting borate glass with a no...

AgNO3/EuF3/YbF3 tri-doped oxyfluoride glass was prepared by a melt-quenching method, in which a high-efficient broadband spectral modification can be realized due to the simultaneous energy-transfer processes of Eu3+→Yb3+, molecular-like Ag (ML-Ag) clusters→Yb3+, and ML-Ag clusters→Eu3+→Yb3+. The spectral measurements indicated that besides the F-c...

The strontium-substituted hydroxyapatite microspheres (SrHA) incorporated alginate composite microspheres (SrHA/Alginate) were prepared via adding SrHA/alginate suspension dropwise into calcium chloride solution, in which the gel beads were formed by means of crosslinking reaction. The structure, morphology and in vitro bioactivity of the composite...

The Na-Ca-B glass microspheres with composition of 10Na2O-10CaO-80B2O3 (wt%) and 19Na2O-17CaO-64B2O3 (wt%) were prepared (denoted by S1 and S2, respectively) by flame spray ball method. The in-situ transformation of the microspheres into hollow hydroxyapatite(HA) and the influence on the pH value of the soaking-liquid were investigated by using pH...

The ZnO-LiYbO2:RE3+ (RE = Er or Ho) hybrid phosphors were synthesized by a sol-gel method and then surface modified with ZnO via a seed deposition method. The structure, morphology and element distribution of the hybrid phosphors were studied by X-ray powder diffraction (XRD), field emission scanning electron microscope (FE-SEM) and energy dispersi...

The upconversion luminescent nanoparticles of NaLnF4(Ln = Y, Gd):Yb3+, Er3+ were prepared through a facile modified solvothermal method, in which the phase (cubic or hexagonal) and size of the NaLnF4 nanoparticles can be well controlled by adjusting Gd3+ content. The Gd3+ content dependent phase transformation and size change were systematically st...

The development of synthetic scaffolds with a desirable combination of properties, such as bioactivity, the ability to locally deliver antibacterial agents and high osteogenic capacity, is a challenging but promising approach in bone tissue engineering. In this study, scaffolds of a borosilicate bioactive glass (composition: 6Na2O, 8K2O, 8MgO, 22Ca...

The pH value plays an important role in controlling the crystallization process and microstructure of the final products in the synthesis of nanocrystals with solvothermal method. This work reported the effect of the mother solution pH value on the precipitation of LiYF4 and YF3 nanoparticles, as well as the microstructure evaluation of YF3 from bo...

Abstract The europium (Eu) and ytterbium (Yb) co-doped SiO2-Al2O3-MF2 (M = Ca, Sr) oxyfluoride glasses were prepared by the melting-quenching method, in which the partial reduction of Eu3+ ions during high temperature fabrication in air atmosphere was explained by optical basicity model. In this system, the near-infrared emission of Yb3+ at 974 nm...

The Tb3+ single-doped and Tb3+-Yb3+ co-doped glass ceramics with the precipitation of CaF2, CaF2-SrF2 solid state solution and SrF2 nanocrystals were designed and prepared by taking different amounts of CaF2 and SrF2 as the starting fluorides to investigate the influence of the crystalline phase on the total quantum efficiency. The formation of the...

NaLnF4 (Ln = Y, Gd): Pr3+, Yb3+ nanocrystals were prepared through a facile modified solvothermal method, in which the cubic to hexagonal phase transformation and size evaluation of NaLnF4 nanocrystals could be well controlled by carefully adjusting Gd3+ content. In this system, the infrared emission associated with Yb3+: 2F5/2 → 2F7/2 transition c...

Strontium doped hydroxyapatite microspheres with special pore structure and surface properties were prepared through a hydrothermal method, using cetyl trimethyl ammonium bromide (CTAB) with has the hydrophobic group function as a template agent, and they were characterized by different test methods. Meanwhile, the relationship between the content...

Ho(3+)/Yb(3+) codoped TeO2-WO3-ZnO-ZnX2(X=F, Cl) glasses were prepared by melt-quenching method. The absorption spectra, transmittance spectra, X-ray diffraction (XRD) curves, Raman spectra and mid-infrared fluorescence spectra were measured, along with the Judd-Ofelt intensity parameters, stimulated emission and absorption cross-sections were calc...

The Ho/Yb co-doped TeO2–WO3–ZnX(X = O/F2/Cl2) glasses were prepared by using the convention melt-quenching method. The physical and chemistry stabilities were studied by DTA (differential thermal analysis) and acid corrosion method, and the crystallization kinetics of the glasses were also studied. The luminescent properties of the glasses were stu...

The multifunctional strontium (Sr)-substituted hydroxyapatite microsphere was prepared via hydrothermal method, in which the luminescent and controlled drug release functions can be realized. The structure and morphology of the as-prepared microspheres were studied by using XRD, FTIR, SEM, TEM, HR-TEM, BET method. The optical properties was investi...

The microstructure and microanalysis of Yb3+ and Li+ co-doped ZnO has been studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Co-doping ZnO with Li+ and Yb3+ by solid state reaction method produces a new LiYbO2 phase. Formation of the LiYbO2 is intermediated by ZnO. Nucleation and growth of LiYbO2 occur at...

Strontium Hydroxyapatite (SrxCa10-x (PO4)6(OH)2, x=0, 3, 5, 10) powder with fluorescence property was successfully synthesized by a facile hydrothermal process. X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectra, field emission scanning electron microscope and photoluminescence excitation and emission spectra we...

Monodispersed Fe3O4@m-SiO2 mesoporous nanoparticles were prepared via a sol–gel method. The single model and bimodel mesoporous magnetic nanoparticles were prepared via an ethanol reflux method or a calcination method to remove template, respectively. The component, structure and properties were characterized by X-ray diffraction, Fourier transform...

The Cr³⁺-Yb³⁺ codoped YAG crystals were synthesized by the solid state reaction method, in which the intense near-infrared emission around 1000 nm originated from Yb3+ 2F5/2→²F7/2 transition was obtained due to the efficient energy transfer from Cr³⁺ to Yb³⁺. The stable and transient spectral measurements revealed that the phonon assistant energy t...

In order to explore the potential application prospect of luminescent strontium-substituted hydroxyapatite as a drug carrier material in the field of bone disease treatment, hydroxyapatite powders with different mole ratios of Sr/(Ca+Sr) were prepared by a hydrothermal method at 180 for 24 h using Ca(NO3)2•4H2O), Sr(NO3)2, (NH4)2HPO4, C6H5Na3O7•2H2...

The broadband spectral conversion from near-UV absorption into near-infrared emission around 1 μm is reported in the ZnO–LiYbO2 hybrid phosphor, which is the benefit from the efficient energy transfer from ZnO to the Yb3+ ions that are specifically located at the interfacial diffusion regions between ZnO and LiYbO2, rather than those in LiYbO2 crys...

We report on spectral modification from visible to near-infrared (NIR) in Pr3+ and Yb3+ codoped oxyfluoride glass for c-Si solar cell. The excitation and emission spectra indicate the energy transfer from Pr3+ to Yb3+. The theoretical quantum efficiency is calculated based on the fluorescent lifetime and has reached more than 150%. However, the ext...

The ZnO-LiYbO2 hybrid phosphors with various Yb2O3 and Li2CO3 starting concentrations were prepared by using the solid-state reaction method in a weak reducing atmosphere. Under the excitation of ZnO absorption with near-UV photons, the intense near infrared emission originated from Yb3+:F-2(5/2)-> F-2(7/2) transition can be observed due to the eff...

In the Tb3+–Yb3+ codoped glass ceramics with SrF2 nanocrystals precipitated, the energy transfer mechanism from Tb3+ to Yb3+ was investigated. The excitation power dependence of emission intensity study showed that the quantum cutting occurs during the energy transfer from Tb3+ to Yb3+ with the excitation of Tb3+ high energy level. However, the one...

Broadband down-conversion spectral modification based on energy transfer of rare earth ions has a possibility to improve the conversion efficiency of solar cell due to the prohibition of the thermal loss of the excess photon energy. Recent developments on the spectral modification were reviewed. Rare-earth ions such as Eu2+, Yb2+ and Ce3+ with f–d...

We report on the luminescent properties of ZnO-LiYbO2 hybrid phosphor, in which the broadband spectral modification can be realized to benefit the enhancement of silicon solar cell photovoltaic conversion efficiency. Under the excitation of ZnO band-band absorption and exciton absorption in the near-UV region, the intense Yb3+ emission around 1000...

Broadband down-conversion spectral modification attracts our attention followed by narrowband down-conversion due to its applicability for solar cells. This article reviews on the recent research development on broadband down-conversion spectral modification based on energy transfer: (1) f–d transition rare earth ions including Eu2+, Ce3+ and Yb2+...

Broadband spectral conversion from visible light to near-infrared radiation in Ce(3+)-Er(3+) codoped yttrium aluminium garnet is reported. Excitation, emission, time-resolved luminescence spectra and fluorescence decay curves have been measured to prove the energy transfer from Ce(3+) to Er(3+). The broadband and strong absorption of Ce(3+), effici...

The diffusion of rare-earth ion, Yb ³⁺ , into ZnO lattice has been measured using spatially resolved electron energy-loss spectroscopy in transmission electron microscopy. Although a trace of Yb ³⁺ can be detected in ZnO, the diffusion distance was only in a magnitude of several tens of nanometers. It also discovered that larg...

We report on conversion of near-ultraviolet and visible radiation ranging from 250 to 500nm into near-infrared emission by a Ca8Mg(SiO4)4Cl2: Eu2+, Er3+ phosphor. Efficient 1530-1560nm Er3+ emission (4I13/2→4I15/2) was detected under the excitation of Eu2+ (4f→5d) absorption band as a result of energy transfer from Eu2+ to Er3+, which is confirmed...

We report on conversion of near-ultraviolet and visible radiation ranging from 250 to 500 nm into near-infrared emission by a Ca(8)Mg(SiO(4))(4)Cl(2): Eu(2+), Er(3+) phosphor. Efficient 1530-1560 nm Er(3+) emission ((4)I(13/2)-->(4)I(15/2)) was detected under the excitation of Eu(2+) (4f?5d) absorption band as a result of energy transfer from Eu(2+...

Poly (vinyl alcohol) (PVA) and poly (vinyl pyrrolidone) (PVP) nanofibers embedding Ag nanoparticles (5–18nm) have been prepared successfully by electrospinning at room temperature. Scanning electron microscope (SEM), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Fourier transform IR spectra (FTIR), and Raman sca...

Yb(2+) and Yb(3+) co-activated luminescent material that can cut one photon in ultraviolet and visible region into multi NIR photons could be used as a downconversion luminescent convertor in front of crystalline silicon solar cell panels to reduce thermalization loss of the solar cell. After a direct excitation of Yb(2+) ions, an intense Yb(3+) lu...

We report on effect of Ce3+ co-doping on the downconversion luminescence in Tb3+–Yb3+ co-doped borate glasses. The luminescence properties of glasses singly doped and co-doped with Ce3+, Tb3+ and Yb3+ have been investigated. After co-doping with Ce3+ in the Tb3+–Yb3+ doped glasses, the near-infrared energy transfer involving the 2F5/2→2F7/2 emissio...

Cr3+-doped LiInSiO4 phosphors were prepared by a solid-state reaction method. X-ray diffraction measurement was carried out for crystalline phase identification. Absorption, photoluminescence, excitation, and time-resolved spectra were measured to investigate the optical properties of the phosphors. Two broadband near-infrared emissions centered at...

We report on highly localized precipitation of copper nanoparticles in borate glasses by irradiation with femtosecond laser pulses. The area in the vicinity of the laser focal point of an 800nm femtosecond laser inside the glass sample became red due to the precipitation of copper nanoparticles after the femtosecond laser irradiation. The precipita...

The ZnO-LiYbO(2) hybrid phosphors were sintered by the solid-state reaction method, in which the intense near-infrared emission around 1000 nm due to Yb(3+ 2)F(5/2)-->(2)F(7/2) transition was obtained due to the efficient energy transfer from ZnO to Yb(3+) ions. The growth of the LiYbO(2) crystal and the formation of the diffusion layer between LiY...

A Eu2+ and Yb3+ coactivated CaAl2O4 phosphor that can cut one photon in UV and visible regions into two near-infrared (NIR) region photons could be used as a downconversion luminescent convertor in front of crystalline silicon solar cells to reduce the thermalization loss. The luminescence spectra in both visible and NIR regions and the luminescenc...

We report broadband downconversion from ultraviolet to near-infrared in Yb 3 + -doped oxygen-deficient Sr O – Al 2 O 3 – Ge O 2 glasses. Oxygen-deficient centers are introduced in germanate glasses by adding metal Al instead of corresponding oxide ( Al 2 O 3 ) . Tunable luminescence related to these defects is observed. Conversion of broadband ultr...

We report on the use of 800 nm, 250 kHz femtosecond laser pulses to precipitate Er(3+)-doped CaF(2) crystals inside oxyfluoride glass, which was confirmed with x-ray diffraction analysis. Confocal upconversion luminescence spectra show that the precipitated crystals have greatly enhanced upconversion luminescence intensity in comparison with unmodi...

BCNO phosphor derived from a low-temperature urea route is an efficient and environmental-friendly phosphor with emission covering the full visible and the near ultraviolet region. Systematic characterization of the BCNO phosphor was carried out by means of steady state and time-resolved spectroscopy in order to unveil the origins of different lumi...

Near-infrared quantum cutting involving the emission of near-infrared photons by downconversion cooperative energy transfer from Eu2+ to Yb3+ in borate glasses was reported. Electron spin resonance spectra and absorption spectra were measured to prove the existence of Eu2+ in borate glasses. Excitation, emission, and fluorescence decay measurements...

Quantum cutting down-conversion (DC) with the emission of two near-infrared photons for each blue photon absorbed is realized in Yb³⁺-Tb³⁺ codoped borosilicate glasses. With the excitation of Tb³⁺ ion by a 484-nm monochromatic light, emission from the ²F_5/2 rarr ²F_7/2 tran...

In this paper, we report on spectroscopic studies of Cr 3+ / Ni 2+ codoped transparent glass ceramics containing-Ga 2 O 3 nanocrystals. Energy transfer between Cr 3+ and Ni 2+ in the Cr 3+ / Ni 2+ codoped glass ceramics has been investigated by steady state emission spectra, time-resolved emission spectra, and excitation spectra. The nonradiative e...

A facile strategy based on the reaction of urea and boric acid is developed for the synthesis of toxicity-free BCNO nanocrystals containing carbon impurities and which exhibit efficient multi-color fluorescence under both single-photon and two-photon excitation.

In the present paper, we investigate the near-infrared (NIR) luminescence of Tb3+–Yb3+ codoped lanthanum borogermanate (LBG) glasses under visible and ultraviolet light excitation. The results indicate that NIR quantum cutting occurs through cooperative energy transfer from Tb3+ to Yb3+ ions when only 4f 8 levels of Tb3+ ions are excited in the wav...

We report greatly enhanced femtosecond laser-induced precipitation of nonlinear optical crystals in glasses owing to the addition of silver. Ba(2)TiSi(2)O(8) (BTS) crystals were space-selectively precipitated inside a Ag(+)-doped BaO-TiO(2)-SiO(2) glass by using a focused femtosecond laser with 800 nm, 250 kHz, and 150 fs. The laser induced crystal...

One-dimensional TiO2:xSm3+ microfibers and microbelts were prepared by electrospinning. X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectrometer (EDS), high-resolution transmission electron microscopy (HRTEM), photoluminescence (PL), electron paramagnetic resonance (EPR), and polarized luminescence measureme...

A BCNO-based long-persistent phosphor prepared by a low-temperature liquid-phase route is investigated. It shows a phosphorescence peak centered at and its afterglow decay curve fits . Electron paramagnetic resonance confirms the presence of a paramagnetic center, the signal of which exhibits a synchronized decay with the afterglow intensity. W...

We demonstrated the conversion of near-ultraviolet radiation of 250–350 nm into visible emission of 450–600 nm and near-infrared emission of 970–1100 nm in the Yb ₂ O ₃ doped transparent 40 SrO- 20 TiO ₂-40 SiO ₂ glasses. The observed broad visible emission band centered at 510 nm is associated with silic...

Ag nanoparticle embedded NaYF(4):0.05Tb.xCe/PVP (PVP stands for poly(vinyl pyrrolidone)) composite nanofibers have been prepared by electrospinning. A field emission scanning electron microscope and x-ray diffraction have been utilized to characterize the size, morphology and structure of the as-prepared electrospun nanofibers. Obvious photolumines...

We report on the cooperative energy transfer process in RE3+-Yb3+ (RE=Pr, Tm and Tb) codoped transparent glass-ceramics containing CaF2 nanocrystals, which are capable of splitting a visible photon absorbed by RE3+ into two near infrared photons emitted by Yb3+. The formation of CaF2 nanocrystals in the glass-ceramics was confirmed by X-ray diffrac...

NaYF₄: 0.02Ermiddot x Yb-PVP composite nanofibers with the diameter of ~400 nm have been prepared by electrospinning. Field emission scanning electron microscope and X-ray diffraction have been utilized to characterize morphology and structure of the as-prepared electrospun nanofibers. Their up-conversion luminescence is investigated und...

Cr 3+ /Ni 2+ co-doped optically transparent magnesium aluminosilicate glass-ceramics containing MgAl 2 O 4 nanocrystals have been prepared by heat-treatment. Greatly enhanced broadband near-infrared emission centered at 1216 nm in Cr 3+ /Ni 2+ co-doped glass ceramics is observed when compared with the Ni 2+ single-doped glass ceramics under 532 nm...

We report on cooperative downconversion in Yb(3+)-RE(3+) (RE=Tm or Pr) codoped lanthanum borogermanate glasses (LBG), which are capable of splitting a visible photon absorbed by Tm(3+) or Pr(3+) ions into two near-infrared photons. The results indicate that Pr(3+)-Yb(3+) is a more efficient ion couple than Tm(3+)-Yb(3+) in terms of cooperative down...

We report on the conversion of near-ultraviolet radiation of 250–350 nm into near-infrared emission of 970–1100 nm in Yb ³⁺ -doped transparent glass ceramics containing Ba ₂ TiSi ₂ O ₈ nanocrystals due to the energy transfer from the silicon–oxygen-related defects to Yb ³⁺ ions. Efficient Yb <s...

Oxyfluoride aluminosilicate glasses with compositions of 50SiO2–20Al2O3–20BaF2–10GdF3–0.5PrF3–xYbF3(x = 0, 1.0, 2.5, 5, 7.5, 10, 15, 20, 25, and 30 mol%) have been prepared to study their thermal and optical properties. From the differential thermal analysis (DTA) measurement, glass-transition temperatures and onset crystallization temperatures hav...

Oxyfluoride aluminosilicate glasses in the composition of 50SiO2–20Al2O3–20LiF–10GdF3–0.5TmF3–xYbF3 (x = 0, 1.0, 2.5, 5, 7.5, 10, 15, 20, 25 and 30 mol%) have been prepared to study their thermal and optical properties. From the differential thermal analysis measurements, glass transition temperatures and onset crystallization temperatures have bee...

Eu2+ and Mn2+ co-doped α - and Β -Ca2 P2 O7 are prepared by solid-state reaction. An orange emission band originating from the T4 1 (G4) - A6 1 (S6) transition of Mn2+ is observed in both phases upon UV excitation through energy transfer from Eu2+ to Mn2+. Photoluminescence and energy transfer in α -Ca2 P2 O7: Eu2+, Mn2+ are investigated as a funct...

Tm(3+)-Yb(3+) codoped transparent oxyfluoride glass ceramics containing LaF(3) nanocrystals were obtained by thermal treatment on the as-made glasses. The formation of LaF(3) nanocrystals and the incorporation of Tm(3+) and Yb(3+) into LaF(3) nanocrystal lattice were confirmed by X-ray diffraction and high resolution transmission electron microscop...

Ultra-broadband luminescent sources that emit light over an extremely wide wavelength range are of great interest in the fields of photonics, medical treatment, and precision measurement. Extensive research has been conducted on materials doped with rare-earth and transition-metal ions, but the goal of fabricating an ultra-broadband emitter has not...

Tb3+–Yb3+ codoped transparent oxyfluoride glass ceramics containing CaF2 nanocrystals were synthesized. The formation of CaF2 nanocrystals in the glass ceramics was confirmed by x-ray diffraction and high resolution transmission electron microscopy. The incorporation of Tb3+ and Yb3+ into CaF2 nanocrystal lattice was confirmed by energy dispersive...