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The preparation and luminescent characters of mesoporouss SiO2/Sm composite materials
摘要： During the mesoporous SiO2 preparation process, Sm3+ ions are dissolved in the anhydrous ethanol solution. The ethanol solution permeates the mesoporous SiO2 then the gel is formed by sol-gel synthesis method. Such, the Sm3+ ions are absolutely introduced into the porous of the mesoporous SiO2 when the gel is dried. In this study, the mesoporous SiO2/Sm3+ composite materials were synthesized by the sol-gel synthesis method. A series of characterization means were used to evaluate the structures of the materials. The near infrared spectrum was used to evaluate the luminescent characteristics. The excitation and emission spectrum of prepared materials showed that the materials had better near infrared luminescent characteristics.
关键词： character,luminescent,rare earth,SiO2 aerogel,sol-gel method
更新于2025-09-19 17:15:36
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Application of Judd-Ofelt Theory Upon Chlofluorophosphate Glass Doped with Erbium
摘要： A series of erbium doped glasses chlorofluorophosphates were prepared and characterized. The absorption spectra were analyzed to determine the Judd-Ofelt parameters. The optical performance of these doped glasses suggesting the relevance of these glasses for optical fiber/ wave guide lasers and optical amplifiers.
关键词： and optical amplifier,rare earth,Judd-Ofelt parameters,glass doped,laser,erbium
更新于2025-09-19 17:15:36
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Hydrothermal Synthesis and Luminescent Properties of Spindle-Like NaGd(MoO <sub/>4</sub> ) <sub/>2</sub> :Eu <sup>3+</sup> Phosphors
摘要： Spindle-like NaGd(MoO4)2: Eu3 + phosphors with various Eu3 + concentrations were prepared via a hydrothermal process and characterized using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The XRD results suggested that the prepared samples had a scheelite structure. The FE-SEM images indicated that the prepared NaGd(MoO4)2: Eu3 + phosphors were spindle-like. The influences of the ratio of sodium citrate and the rare earth cations on the product were studied. It was found that sodium citrate, as the chelating agent, could significantly influence the structure and morphology of the samples. The emission spectra, excitation spectra, fluorescence decay curves, and quantum yields of the samples were measured. The luminescent properties of the materials were studied. The results indicated that the electron–phonon coupling between the Eu3 + and the NaGd(MoO4)2 host was weak, and with the increase of the Eu3 + concentration, the Huang–Rhys factor increased. Additionally, the quantum efficiency of the Eu3 + 5D0 level was calculated, and it was found that the quantum efficiency decreased with the increase of the Eu3 + concentration.
关键词： Electron-phonon coupling,Rare earth,Hydrothermal,Molybdate,Luminescence
更新于2025-09-19 17:15:36
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Luminescent colour modulation of a multicolour praseodymium activated phosphor
摘要： A phosphor is a material that emits luminescence under stimuli. A 4f-4f RE3+ ion commonly shows an invariable luminescent colour due to the shielding of outer electrons. Here, a multicolour Pr3+-activated phosphor is developed. The luminescent colour of Pr3+ in the phosphor can be modulated from red to white. This investigation reveals that this modulation essentially corresponds to the different relaxation pathways of Pr3+ levels in low-phonon-energy hosts. Based on the specific characteristics of the phosphor, a multicolour image is fabricated for application in anticounterfeiting.
关键词： Rare earth,Luminescent colour,Phosphor,Luminescence
更新于2025-09-19 17:15:36
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Luminescence Properties of Dy3+ and Sm3+: Potassium Lithium Borate Glass
摘要： The present paper describes the spectral properties of Sm3+ (0.4 mol%) and Dy3+ (0.4 mol%) ions-doped 20Li2O–10K2O–70B2O3 glasses. X-ray diffraction method was use to confirm the amorphous phase of samples. The physical properties have been determined based on UV absorption spectra. The hypersensitive transition of Dy3+ and Sm3+ is found due to transition of (6F11/2,6H9/2) and (6F7/2), respectively. The emission bands of Dy3+: glass has shown around 572 nm, 612 nm and 646 nm; these emissions are attributed to the transitions of 4F9/2 →6H15/2 (yellow), 4F9/2 - 6H13/2 (red) and 4F9/2 -6H11/2 (red). With regard to Sm3+: glass has three emission bands those have been generated from 4G5/2 → 6H5/2 (616 nm), 4G5/2 → 6H 7/2 (660 nm) and 4G5/2 → 6H9/2 (719 nm) transitions. The current results promise several applications in optical fields such as UV-sensor, developing new color light sources and tunable visible lasers.
关键词： physical properties,rare-earth ions,luminescence,Glasses
更新于2025-09-19 17:15:36
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Mechanistic Insight into Energy Transfer Dynamics and Color Tunability of Na4CaSi3O9:Tb3+, Eu3+ for Warm White LEDs
摘要： We propose a latent energy transfer process in traditional Eu3+, Tb3+-doped phosphors and present a new class of Eu3+, Tb3+-doped Na4CaSi3O9 phosphors, enabled by luminescence decay dynamics that optimize the electron-transfer energy process. Compared with other Eu3+, Tb3+-doped phosphors, the as-synthesized Eu3+, Tb3+-doped Na4CaSi3O9 phosphors show improved large-scale tunable emission color from green to red upon UV excitation, controlled by the Tb3+/Eu3+ doping ratio. Detailed spectroscopic measurements in the VUV-UV-vis region were used to determine the Eu3+-O2- charge transfer energy, 4f-5d transition energies and the energies of 4f excited multiplets of Eu3+ and Tb3+ with different 4fN electronic configurations. The Tb3+→Eu3+ energy transfer pathway in the co-doped sample was systematically investigated, employing luminescence decay dynamics analysis to elucidate the relevant energy transfer mechanism in combination with the appropriate model simulation. To demonstrate their application potential, a prototype white light-emitting diode (WLED) device was successfully fabricated using the yellow luminescence NCSO:0.03Tb3+,0.05Eu3+ phosphor with high thermal stability and a BaMgAl10O17:Eu2+ phosphor in combination with a near-UV chip. These findings open up a new avenue to realize and develop multifunctional high-performance phosphors by manipulating the energy transfer process for practical applications.
关键词： Luminescence,Energy transfer,Phosphor,Luminescence decay dynamics,Rare earth
更新于2025-09-19 17:13:59
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Rare earth ions doped NiO hole transport layer for efficient and stable inverted perovskite solar cells
摘要： Hole transport layer plays a critical role in achieving high performance and stable inverted perovskite solar cells (PSCs). Doping has been proved to be an effective strategy to modify the electrical and optical properties of semiconductor oxides. Herein, rare earths (REs: Ce, Nd, Eu, Tb, and Yb) elements are systemically doped into the NiOx hole transport layer (HTL) via a simple solution-based method. The results demonstrate that the REs doping could considerably modify the compactness, conductivity, and band alignment of the NiOx HTL, leading to the highly improved permanence of the inverted PSCs. The PSCs using 3% Eu:NiOx HTL yielded the optimum power conversion efficiency of 15.06%, relatively improved 23.4% compared with the PSC using pristine NiOx HTL (12.20%). It also demonstrated much better long time stability. The improved photovoltaic properties of the device can be attributed to the more efficient charge extraction and suppressed interfacial recombination rate by the introduction of appropriate REs in the NiOx HTL. This work indicates that RE doping is a very effective and promising strategy to achieve adjustable hole extraction material for high and stable inverted PSCs.
关键词： Rare earth ions,Perovskite solar cells,Doped NiOx film,Inverted planar structure
更新于2025-09-19 17:13:59
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Fabrication of low loss channel waveguide in tungsten-tellurite glass by 11?MeV carbon ion microbeam for telecom C band
摘要： Channel waveguides were directly written in Er: TeO2W2O3 glass using 11 MeV C4+ ion microbeam with fluences in the range of 1·1014–5·1016 ion/cm2. The channel waveguides supported a single guided mode at λ = 1540 nm. Propagation losses of the as-irradiated channel waveguides were around 14 dB/cm. A 30-min thermal annealing at 150 °C in air reduced propagation losses at λ = 1400 nm to 1.5 dB/cm. This method produced channel waveguides with confinement and propagation losses comparable to or better than other current methods, such as MeV energy focused proton or helium ion beam writing.
关键词： Microstructure fabrication,Channel waveguides,Rare earth doped materials,Integrated optics,Optical design and fabrication
更新于2025-09-19 17:13:59
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Silicone elastomers filled with rare earth oxides
摘要： Silicones which possess, amongst others, remarkable mechanical properties, thermal stability over a wide range of temperatures and processability, and rare earth oxides (REO), known for their unique optic, magnetic and catalytic properties can be coupled into multifunctional composite materials (S-REOs). In addition, the intrinsic hydrophobicity of REO and polysiloxanes makes them easily compatible without the need for surface treatments of the former. Thus, europium oxide (Eu2O3), gadolinium oxide (Gd2O3) and dysprosium oxide (Dy2O3) in amounts of 20 pph are incorporated as ?llers into silicone matrices, followed by processing mixture as thin ?lms and crosslinking at room temperature. The analysis of the obtained ?lms reveals the changes induced by these ?llers in the thermal, mechanical, dielectric and optical properties, as well as the hydrophobicity of the silicones. The luminescence properties of S-REO composites were investigated by ?uorescence spectra and lifetime - resolved measurements with a multiemission peaks from blue to greenish register. The thermogravimetrical analysis indicates an increasing of thermal stability of the composites that contain REO, compared to pure silicone. As expected, the dielectric permittivity signi?cantly increased due to nature of the ?llers, while the dielectric loss values are relatively low for all samples, indicating a minimal conversion of electrical energy in the form of heat within bulk composites. The presence of rare earth oxides into the silicone matrix facilitates the motions of long-range charge carriers through the network resulting in higher values of conductivity of the composite ?lms. The stress-strain measurements revealed the reinforcing effect of the rare earth metal oxides on a silicone matrix, leading to a signi?cant increase of Young modulus. The known hydrophobicity of silicones is further enhanced by the presence of REO.
关键词： silicone,rare earth oxides,active ?llers,hydrophobicity,composites
更新于2025-09-19 17:13:59
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CMOS-Compatible Optical Phased Array Powered by a Monolithically-Integrated Erbium Laser
摘要： An advanced CMOS-compatible 300-mm-wafer silicon-photonics platform is introduced that consists of a silicon layer with eight doping masks, two silicon-nitride layers, three metal and via layers, a dicing trench for smooth edge-coupled facets, and a gain-film trench that enables interaction between the gain material and waveguide layers. The platform was used to demonstrate an electrically-steerable integrated optical phased array powered by an on-chip erbium-doped laser. Lasing with a single-mode output, 30 dB side-mode-suppression ratio, and 40 mW lasing threshold was shown, and one-dimensional beam steering with a 0.85? × 0.20? full-width at half-maximum and 30?/W electrical steering efficiency was demonstrated. This system represents the first demonstration of a rare-earth-doped laser monolithically integrated with an active CMOS-compatible silicon-on-insulator photonics system.
关键词： Silicon photonics,rare-earth-doped lasers,integrated optical phased arrays,photonic integrated circuits
更新于2025-09-19 17:13:59