- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Development of Eu3+ doped boro-tellurite oxyfluoride glass and their Judd-Ofelt analysis for red laser gain medium application
摘要： This paper investigated the physical, optical, luminescence and radiative properties of Eu3+ doped borotellurite oxyfluoride glass with composition (30-x)TeO2-30B2O3-10ZnF2-30BaO-xEu2O3 where x are 0.05, 0.10, 0.50, 1.00 and 1.50 mol%. The glass samples were fabricated by melt and quenching method. The physical and optical properties were investigated from density, molar volume and refractive index. Meanwhile absorption spectra that show several transitions in the ultraviolet to near infrared region interpret the optical properties of the glass sample. The emission spectra of glass sample were measured under excited ?ex = 394 nm. The highest peak of emission spectra occurs in 1.5 mol% of Eu2O3 due to 5D0→7F2 transition centered at 613 nm. The emission intensity was increased by the addition of Eu2O3 from 0.05 mol% to 1.5 mol%. In addition, Judd-Ofelt (JO) theory was used to define the radiative properties and lasing potential of the glass sample. The value of JO parameter ?2, ?4, ?6 was calculated and compared with literatures. Other radiative properties including experimental (fexp) and calculated (fcal) oscillator strengths, stimulated emission cross-sections (σ), radiative transition probability (AR), experimental and calculated branching ratios (?R) of glass sample were determined and discussed in term of red laser gain medium application.
关键词： Oxyfluoride glass,Europium,Gain medium
更新于2025-09-16 10:30:52
-
Investigations of physical parameters of Ge doped binary Se-As chalcogenide glassy alloys for optical fiber application
摘要： Germanium doped chalcogenide glasses have potential applications in non- linear and optoelectronic devices. Ternary Ge-Se-As system has been considered to study the different important physical parameters. The impact of deviation of Ge on the cost of As in Ge-Se-As glassy system has been discussed in terms of average coordination number, cohesive energy, heat of atomization, and the theoretical optical band gap of the system. Almost all the physical parameters are found to change linearly with the variation in Ge content. The physical properties approximated in the present study can reveal the structural details for optical fibers.
关键词： Chalcogenide glasses,cohesive energy,mean bond energy,glass transition temperature,lone pair electrons
更新于2025-09-16 10:30:52
-
[IEEE 2019 IEEE SENSORS - Montreal, QC, Canada (2019.10.27-2019.10.30)] 2019 IEEE SENSORS - Optical Fiber Bragg Grating Based Pressure Sensor Using a Composite Diaphragm For Pressure Measurements
摘要： The development of an optical fiber based pressure sensor, created using a Fiber Bragg Grating (FBG) and a glass fiber reinforced polymer membrane for use in aerodynamic applications, is reported. The FBG was co-bonded on the surface of the membrane to measure the strain induced by the deflection of the diaphragm with applied pressure. The sensor exhibited high sensitivities of 56.7 pm/kPa, with a minimum resolution of 21 Pa over a 0 to 35 kPa range. The outputs from a mathematical model, Finite Element analysis and the experimental results are compared and discussed.
关键词： Glass Fiber Reinforced Polymer,Finite Element Analysis,Fiber Bragg Grating,optical pressure sensor
更新于2025-09-16 10:30:52
-
Response Properties of Gold- and Aluminum-deposited SPR-based Glass Rod Sensors Using Light-emitting Diodes with Various Wavelengths; 各種波長の発光ダイオードを用いる金とアルミニウムを蒸着したガラス棒SPRセンサーの応答特性;
摘要： The response curves of gold (Au)- and aluminum (Al)-deposited surface plasmon resonance (SPR)-based glass rod sensors with various light-emitting diodes (LEDs) of visible and near-infrared emission as the light sources were measured. Au films with thicknesses of 30, 45, and 70 nm, and Al films with thicknesses of 15, 30, and 45 nm were deposited on half of the surfaces of glass rods of 2 mm in diameter with a deposition length of 100 mm. The LEDs of blue (464 nm), green (533 nm), yellow (591 nm), red (654 nm), and near-infrared (934 nm) emissions for Au films, and those of violet (402 nm), blue, green, yellow, red emissions for Al were used. The response curves of these sensors, calculated using a multi-layer Fresnel equation using various dielectric constants for the emission wavelengths reported in literatures, were compared with those obtained in the measurements. The important parameters for the calculations were the LED intensity distribution, the range of the angle of incidence of light into the sensor element, and the thickness distributions of the metal films deposited on the glass rods. Native oxide layers with a thickness of 3.0 nm were considered for Al films. The minimum positions of the experimental response curves agreed well with those of the theoretical response curves within the limits of the experimental uncertainties, though those of the experimental response curves using the LED of near-infrared emission shifted to higher refractivity values, mainly due to the wide wavelength distribution to longer wavelengths of the LED. The agreements between the experimental and theoretical response curves indicate both the potential and the usefulness of the sensor performance estimation process based on the multi-layer Fresnel equation. It was also found that the value of the ratio of the real and imaginary part of the dielectric constant is an easy and useful estimation for SPR.
关键词： multi-layer Fresnel equation,dielectric constant,Au,metal-deposited SPR-based glass rod sensor,Al
更新于2025-09-16 10:30:52
-
[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Effects of constituents in paste on low light performances of silicon solar cells
摘要： Solar cell performances at low light intensity are practically important for power generation capacity in the entire life cycle. Our study has clarified with floating contact method that glass frit, which is an indispensable constituent for silver paste for contact, causes drastic shunts and recombination in the solar cells. In this study, the effects of the glass frit “itself” on the low light performances of the cells are investigated. In conclusion, the glass frit makes the low light performances of the cells lower, especially open-circuit voltage and fill factor, due to its effects on the shunts and recombination.
关键词： glass frit,cell performance,solar cells,low light intensity,silicon,paste
更新于2025-09-16 10:30:52
-
Freestanding and supported processing of sub-70 μm kerfless epitaxial Si and thinned Cz/FZ Si foils into solar cells: An overview of recent progress and challenges
摘要： Utilisation of expensive silicon (Si) material in crystalline Si modules has come down to 4 g Si per watt-peak in 2018, mainly as a result of reduction in wafer thickness and kerf losses as well as increase in module efficiencies. With continued progress in conventional multi-wire sawing of ingots, wafers as thin as 100 μm could eventually be produced. Beyond this, kerfless lift-off technologies are being investigated which enable wafer thicknesses well below 100 μm with negligible Si kerf waste. Such thin Si wafers and foils would be much lighter in weight than today's standard 165-180 μm-thick wafers and would exhibit considerable flexibility and fragility. This necessitates a rethink about how to handle and process thin Si into solar devices in a manufacturing line with high mechanical yield and high throughput. This paper gives a broad overview of the different approaches for fabricating solar cells on thin Si foils. In particular, three routes are discussed in detail, namely (1) freestanding processing of thin Si, (2) processing of thin Si supported mechanically on a conductive low-cost Si substrate (“wafer-equivalent” approach) and (3) processing of thin Si bonded to a transparent glass superstrate. In each case, the main challenges are explained and the recent progress in addressing them are summarised. Kerfless 50 μm-thick epitaxial Si foils lifted-off using porous Si and thinned-down Si wafers (below 70 μm) are used as model substrates for this work.
关键词： Fragility,Layer transfer,Breakage,Lift-off,Glass superstrate,Thin silicon foils,Supported processing,Epitaxial silicon,Bonding,Adhesive,Wafer-equivalent,Low-cost silicon substrate,Flexibility,Kerfless,Freestanding
更新于2025-09-16 10:30:52
-
Luminescent properties of Dy3+/Eu3+ doped fluorescent glass for white LED based on oxyfluoride matrix
摘要： Rare earth ion-doped fluorescent glass has become a hotspot due to its characteristics. This work shows that the prepared Dy3+ and Dy3+/Eu3+ doped glasses have white light emission under ultraviolet excitation. There is a higher yellow light/blue light (Y/B) value, indicating an increase in the covalentity of Dy-O, and decrease in the symmetry with the increasing concentration of dopants (Dy3+). The correlated color temperature (CCT) can be effectively reduced by the red light emission of Eu3+, and the order of influence of excitation wavelength on CCT is 395 nm > 382 nm > 365 nm .The delay curve demonstrates that the energy transfer from Dy3+ to Eu3+. The glass has the characteristics of anti-blue light damage and wide tunable color temperature, which illustrates that it has potential application in the field of white LED.
关键词： correlation color temperature,rare earths,oxyfluoride glass,Y/B intensity ratio,energy transfer
更新于2025-09-16 10:30:52
-
Plasmonic and nonlinear optical behavior of nanostructures in glass matrix for photonics application
摘要： There is a growing interest in bimetallic core shell nanostructures that comprised out of noble metals due to their fascinating plasmonic properties, leading to a wide range of applications in future nanotechnology. Here we report on Ag/Cu core shell nanostructures in a glass matrix. It includes novel approaches for characterizing embedded core shell nanostructures with a detailed study on the nanosize effect in tuning their optical and nonlinear optical properties along with biomedical applications. Annealing the Ag/Cu as- exchanged samples resulted in the formation of core-shell nanostructures, which were confirmed using UV–vis absorption spectroscopy and high-resolution transmission electron microscopy. The prepared plasmonic nanostructures were further studied using X-ray diffraction, Rutherford backscattering, photoluminescence, Raman, X-ray photoelectron spectroscopy and Z scan techniques. The nonlinear optical properties of the glasses containing bimetallic nanoparticles have been studied at a non-resonant wavelength using femtosecond laser pulses and a possible mechanism for the observed nonlinearity have been explained.
关键词： Soda-lime glass,Core-shell nanostructures,Surface plasmon resonance
更新于2025-09-16 10:30:52
-
Reverse Manufacturing Enables Perovskite Photovoltaics to Reach the Carbon Footprint Limit of a Glass Substrate
摘要： Innovative energy technologies with the lowest carbon footprint are needed. Our projections show that the photovoltaics (PVs) industry will have significant CO2 emissions in the transition away from fossil fuels. We demonstrate a reverse manufacturing concept for glass-solder-encapsulated, printed PV, based on in situ crystallization of emerging perovskite photo-absorbers. This concept reduces the CO2 emissions of PV 20-fold, approaching the ultimate lower limit of the glass substrate.
关键词： Perovskite Photovoltaics,Carbon Footprint,Glass Substrate,CO2 Emissions,Reverse Manufacturing
更新于2025-09-16 10:30:52
-
The light-trapping effect in various textured cover glass for enhancing the current density in silicon heterojunction solar cells
摘要： Light trapping by front surface texturing is considered an important mechanism since it can reduce the reflectance on the surface, enhance the photo-generated charge carriers and hence the performance of solar cells. Since the silicon (p, i, n) layers are deposited after surface texturing that may induce various defects leading to a reduction in open-circuit voltage (Voc) and fill factor (FF). In this study, textured glass surfaces and silicon heterojunction solar cells (HJSCs) were prepared separately. The textured glass surface was optically coupled with the index matching solution (IMS) at the front surface of HJSCs for an enhancement in current density. Three wet chemical textured glass surfaces named Etch 1, Etch 2 and Etch 3 were employed based on various optical properties. It was observed during the current density-voltage (J-V) measurements that Voc and FF of the device did not change. Reference HJSC coupled with flat glass showed J-V characteristic as Voc=726.3 mV, FF=76.62%, Jsc=37.9 mA/cm2, ?=21.09% without IMS. The Jsc of HJSCs coupled with textured glass surface can be further enhanced by using IMS due to better light trapping. HJSCs coupled with textured glass (Etch 2) surface showed the highest Jsc of 38.4 mA/cm2 with an efficiency of 21.4% without IMS whereas it showed an efficiency of 22.41% with Jsc of 40.2 mA/cm2 using IMS. The trends in the external quantum efficiency of the HJSCs indicate that the Jsc can be improved if a suitable index matching solution and glass material are used.
关键词： textured glass,current density,light trapping,index matching solution,Solar cell
更新于2025-09-16 10:30:52