- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Optical investigation of Er3+ and Er3+/Yb3+ doped zinc-tellurite glass for solid-state lighting and optical thermometry
摘要： Er3+ and Er3+/Yb3+ doped zinc tellurite (ZnO/TeO2) glasses were prepared using melt quenching technique. Spectroscopic properties of the glasses were studied by absorption spectroscopy, luminescence spectroscopy, and color chromaticity coordinates (CIE-1931) measurements. Upconverted-emission intensities and the CIE-1931 coordinates were strongly affected by the presence of Yb3+ ion, as well as the excitation power density of 975 nm laser light. Effect of temperature on green upconverted-emissions from two thermally coupled 2H11/2 and 4S3/2 levels of Er3+ ions were measured and fluorescence intensity ratio technique was applied to investigate the temperature sensing properties. High sensitivity and short response time properties make ZnO/TeO2 glasses a very good candidate for non-contact optical temperature sensor applications. The maximum sensitivity of the glasses doped with Er3+ and Er3+/Yb3+ were found to be 72×10-4 K-1 and 120×10-4 K-1 at 429 K, respectively which are much higher than previously reported temperature sensors based on Er3+ ion doped materials. Hence, Er3+/Yb3+ doped zinc-tellurite glass can be more suitable than that of doped with Er3+ ions only for color tunable solid-state lighting and non-contact optical thermometry applications.
关键词： Solid-state lighting,non-contact optical thermometry,fluorescence intensity ratio (FIR),zinc-tellurite glass,upconversion
更新于2025-09-09 09:28:46
-
A review on low-molar-mass carbazole- based derivatives for organic light emitting diodes
摘要： Organic light emitting diodes (OLEDs) have attracted a great deal of attention within academia and industry because of their potential applications in flat panel displays and solid-state lighting technologies. Among all low-molar-mass derivatives under investigation in OLEDs field, carbazole-based materials have been studied at length for their interesting physical properties, including good charge injection and transport, electro-luminescence, improved thermal and morphological stabilities as well as film forming properties. In addition, the relatively high triplet energy level of some substituted carbazoles makes them suitable candidates to design hosts for wide bandgap triplet emitters such as blue dopants. The article is written from structural organic chemist's point of view and is divided in several parts: V-shaped 3(2)-substituted carbazoles and derivatives with 9-carbazolyl rings, star-shaped 3,6(2,7)-substituted carbazoles and branched twin derivatives containing (di)arylcarbazolyl fragments.
关键词： Amorphous material,Ionization potential,Glass transition temperature,Organic light emitting diode,Substituted carbazole,Hole transporting material
更新于2025-09-09 09:28:46
-
Integrating Google Glass into simulation-based training: experiences and future directions
摘要： Background: Education experts are starting to explore the potential uses of wearable technology and augmented reality in simulation-based training. In this article, we summarize our experiences with using Google Glass in simulation-based training and discuss potential future directions with this advanced technology. Methods: Emergency medicine residents and medical students participated in a pilot study where each team captain was asked to wear Google Glass during 15 separate simulation-based training sessions. Video obtained from Google Glass was analyzed and utilized during debriefing sessions for the residents and medical students. Results: We were able to successfully integrate Google Glass into simulation-based training and debriefing. During the analysis of each recording, observations were noted about the events that transpired and this data was used to provide instructional feedback to the residents and medical students for self-reflection and appraisal. Post-exercise surveys were conducted after each simulation session and all participants noted that Google Glass did not interfere with their simulation experience. Google Glass enabled the observers to analyze the team captain’s primary visual focus during the entire simulation scenario and feedback was provided based on the data recorded. Conclusions: Wearable technologies such as Google Glass can be successfully integrated into simulation-based training exercises without disrupting the learners’ experience. Data obtained from this integration can be utilized to improve debriefing sessions and self-reflection. Future research is underway and required to evaluate other potential uses for wearable technology in simulation-based training.
关键词： Medical education,Augmented reality,Google Glass,Wearable technology,Simulation-based training
更新于2025-09-09 09:28:46
-
[ASME ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems - San Antonio, Texas, USA (Monday 10 September 2018)] Volume 1: Development and Characterization of Multifunctional Materials; Modeling, Simulation, and Control of Adaptive Systems; Integrated System Design and Implementation - Simulation of a Composite Piezoelectric and Glass Fiber Reinforced Polymer Beam for Adaptive Stiffness Applications
摘要： Glass Fiber Reinforced Polymer (GFRP) beams have shown over a 20% decrease in weight compared to more traditional materials without affecting system performance or fatigue life. These beams are being studied for use in automobile leaf-spring suspension systems to reduce the overall weight of the car therefore increasing fuel efficiency. These systems are subject to large amplitude mechanical vibrations at relatively constant frequencies, making them an ideal location for potential energy scavenging applications. This study analyses the effect on performance of GFRP beams by substituting various composite layers with piezoelectric fiber layers and the results on deflection and stiffness. Maximum deflection and stress in the beam is calculated for varying the piezoelectric fiber layer within the beam. Initial simulations of a simply supported multimorph beam were carried out in ABAQUS/CAE. The beam was designed with symmetric piezoelectric layers sandwiching a layer of S2-glass fiber reinforced polymer and modeled after traditional mono leaf-spring suspension designs with total dimensions 1480 x 72 x 37 mm3, with 27 mm camber. Both piezoelectric and GFRP layers had the same dimensions and initially were assumed to have non-directional bulk behavior. The loading of the beam was chosen to resemble loading of a leaf spring, corresponding to the stresses required to cycle the leaf at a stress ratio between R = 0.2 and 0.4, common values in heavy-duty suspension fatigue analysis. The maximum stresses accounted for are based on the monotonic load required to set the bottom leaf surface under tension. These results were then used in a fiber orientation optimization algorithm in Matlab. Analysis was conducted on a general stacking sequence [0°/45°]s, and stress distributions for cross ply [0°/90°]s, and angle ply [+45°/-45°]s were examined. Fiber orientation was optimized for both the glass fiber reinforced polymer layer to maximize stiffness, and the piezoelectric fiber layers to simultaneously minimize the effect on stiffness while minimizing deflection. Likewise, these fibers could be activated through the application of electric field to increase or decrease the stiffness of the beam. The optimal fiber orientation was then imported back into the ABAQUS/CAE model for a refined simulation taking into account the effects of fiber orientation on each layer.
关键词： adaptive stiffness,composite beams,Glass Fiber Reinforced Polymer,energy scavenging,piezoelectric
更新于2025-09-09 09:28:46
-
<i>In-Situ</i> Raman Measurements of Silicate Glasses during Vickers Indentation
摘要： In-situ structural changes of glass under a sharp diamond indenter are evaluated by using a micro-Raman spectrophotometer coupled with a self-made indentation equipment. This set-up enables us to obtain in-situ Raman spectra of glass under a Vickers indenter and to observe transient and permanent structural changes in glass. It is found that in-situ Raman spectra of silica glass under the Vickers indenter show distinct peak-broadening, which is not observed in the in-situ Raman spectra of hydrostatically compressed silica glass, nor in those of soda-lime silicate glass. This suggests that the indentation-induced shear stress causes the glass structure to be deformed into a di?erent one with a wider bond angle distribution. Such a shear-induced structural change could play a key role on the contact damage of glass, especially for glass with a high degree of polymerization, like silica glass.
关键词： indentation,Raman spectroscopy,glass
更新于2025-09-09 09:28:46
-
New Candidate Multicomponent Chalcogenide Glasses for Supercontinuum Generation
摘要： Broadband supercontinuum (SC) generation requires host material attributes defined by both optical and physical properties and the material’s manufacturability. We review and define the trade-offs in these attributes as applied to fiber or planar film applications based on homogeneous glass property data, and provide a series of examples of how one might optimize such attributes through material compositional and morphology design. As an example, we highlight the role of varying composition, microstructure, and linear/nonlinear optical properties, such as transmittance, refractive index, and the multiphoton absorption coefficient, for a series of novel multicomponent chalcogenide glasses within a model GeSe2-As2Se3-PbSe (GAP-Se) system. We report key optical property variation as a function of composition and form, and discuss how such glasses, suitable for both fiber and planar film processing, could lend themselves as candidates for use in SC generation. We demonstrate the impact of starting glass composition and morphology and illustrate how tailoring composition and form (bulk versus film) leads to significant variation in linear, nonlinear, and dispersive optical property behavior within this system that enables design options that are attractive to optimization of desirable SC performance, based on optical composites.
关键词： photonics,infrared optical materials,chalcogenide glass science,supercontinuum generation,nonlinear optics
更新于2025-09-09 09:28:46
-
Spin-Glass Behavior, Magnetic, and IR Spectroscopy Analysis of Multimetallic Compound Ni <sub/><b>0.25</b> </sub> Mn <sub/><b>1.25</b> </sub> [Fe(CN) <sub/><b>6</b> </sub> ]·6.1H <sub/><b>2</b> </sub> O
摘要： Multimetallic Prussian blue compound Ni0.25Mn1.25[Fe(CN)6]?6.1H2O has been prepared by coprecipitation. The temperature-dependent magnetic susceptibilities show the magnet transition for the compound at 8.5 K. According to DC variable-temperature magnetic susceptibility paramagnetic Curie temperature ?? is ?9.32 K. The observed value of coercive field (Hc) and the remanent magnetization (Mr) for the compound are 0.32 KOe and 0.36??B. According to study of zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves and AC magnetization curves, there exists a spin-glass behaviour in the compound, which exhibits freezing temperature ????=7.76 K, below magnetic transition ????=8.5 K; that glass behavior is termed “reentrant” spin glass.
关键词： magnetic properties,Prussian blue,spin-glass,multimetallic compound
更新于2025-09-09 09:28:46
-
Selenization of (Cu, In, Ga)/Se/Mo/Glass Thin Films: A Real-Time Synchrotron X-ray Scattering Study
摘要： The precursor selenization of (Cu, In, Ga)/Se/Mo/glass thin films during annealing without additional supply of Se was studied through a real-time synchrotron X-ray scattering experiment. At a lower temperature, the crystalline CIS, Cu2In, In2Se3, and Ga2Se3 phases were formed. By increasing the temperature, some parts of the crystalline CIS phase decomposed into Cu2In and In2Se3 phases. At a higher temperature, the crystalline CIGS phase was synthesized gradually by the reaction of the crystalline Cu2In, In2Se3, and Ga2Se3 phases, and not by direct crystallization of the amorphous precursor. The behavior of the integrated intensities and the crystal domain sizes were consistent with the changes in X-ray powder diffraction profiles. The high synthesis temperature in the CIGS phase was attributed to the high activation energy barrier for diffusion of Ga ions in the crystalline Ga2Se3 phase.
关键词： Real-Time Synchrotron X-ray Scattering,Synthesis of the CIGS Phase,Selenization During Annealing,(Cu, In, Ga)/Se/Mo/Glass Thin Films
更新于2025-09-09 09:28:46
-
Recent advances in the chemical strengthening of glass
摘要： Since its development in the early 1960s till recently, applications of the glass chemical strengthening technology were limited mostly to aircraft cockpit windshields, photocopier transparencies, and hard disks. The interest has been renewed by a need to have stronger and lighter glass products, led mostly by display cover in personal mobile electronic devices, such as cell phones, and glass packaging for safe delivery of medicines in pharmaceutical applications. In this paper, I suggest that the science of the compressive stress development is nearly completely understood. The so-called “dilation anomaly” is resolved. Newer technologies are being developed, for example, thin float-produced flat glasses can be strengthened with reduced warp. Molten salt bath maintenance techniques to avoid discarding of degraded salt have been developed to some extent. In addition to more and more pharmaceutical businesses looking to strengthen the glass packaging to avoid costly recalls, interest is also high in break-resistant automobile and locomotive transparencies. Other miscellaneous topics where the use of chemically strengthened glass could bring value-added premium are also mentioned.
关键词： molten salt bath,pharmaceutical packaging,chemical strengthening,compressive stress,glass,automobile transparencies,dilation anomaly
更新于2025-09-09 09:28:46
-
Excitation power dependence of Eu3+ photoluminescence in barium borate glass
摘要： Eu3+-doped barium borate glasses are analysed for their optical and excitation power dependent luminescence properties. The glasses, doped with different concentrations of the lanthanide ion Eu3+, provide photoluminescence quantum efficiencies higher than 80% and, show a bright luminescence in the red spectral range, making them attractive for lighting applications.
关键词： Eu3+,lighting applications,barium borate glass,photoluminescence,quantum efficiency
更新于2025-09-09 09:28:46