【摘 要】
:
Exploring lanthanide doped materials and their high-pressure optical properties is important from the perspective of designing pressure sensors,piezoelectric ma
【机 构】
:
Department of Mechanical Engineering, University of Texas Rio Grande Valley, Edinburg, TX 78539, USA
论文部分内容阅读
Exploring lanthanide doped materials and their high-pressure optical properties is important from the perspective of designing pressure sensors,piezoelectric materials,scintillators,and optoelectronic devices,just to mention a few.Understanding the high-pressure optical properties of polymeric fibrous mats provides significant advantages in terms of flexibility,tunability,facile processability,and malleability.In this work,we have developed flexible polyvinylidene difluoride (PVDF) fibrous mats doped with an Eu3+ source of Eu(NO3)3·5H2O (EN-PF) or Eu2(SO4)3 (ES-PF) by a Forcespinning(R) method.Microstructural analysis of these two systems indicates that Eu(NO3)3·5H2O and Eu2(SO4)3 are homogeneously distributed and dispersed into the PVDF matrix.Fiber formation promotes a β-phase PVDF.Eu3+ doping increases the β-phase.Its fraction is larger for the ES-PF mats.To understand their high-pressure optical properties,their photoluminescence spectra have been taken at various pressures up to 58 GPa in a diamond anvil cell.High-pressure luminescence illustrates a clear change in asymmetry ratio,peak intensity,peak breadth,color coordinate,and color temperature of Eu3+ ions from both EN-PF and ES-PF with a different extent of changes.Specifically,Eu3+ ions in the ES-PF mats switch from asymmetric to symmetric environment as pressure increases.Those in the EN-PF mats present symmetric environment for all tested pressures.Both of the Eu3+ doped PVDF systems present irreversible changes.Therefore,the EN-PF fibrous mats present an opportunity to make pressure induced red-orange-yellow tunable phosphors for multifunctional applications.
其他文献
Various excellent properties of rare earth zirconate and stannate pyrochlores are close related with their native point defects.First-principles calculations ar
The microstructures of 316 L stainless steel created by rapid solidification are investigated by comparing the similar microstructures of individual hatches of
The unsatisfactory rate capability and poor cycling stability at high rate of sodium-ion batteries (SIBs) have impeded their practical applications.Herein,a Na3
A well designed coating for polyetheretherketone (PEEK) implants can provide enough support to overcome crucial medical challenges,which are insufficient osseoi
Hot water droplet and oils induced air cushion failure,intensively used fluorine-containing chemicals,tedious preparation process,etc.are the main bottlenecks o
Precipitation-hardened high entropy alloys (HEAs) with carefully tuned compositions have shown excellent mechanical properties,demonstrating great potential for
Ferromagnetic high damping (FHA) alloys with a wide temperature range from-150 ℃ to 300 ℃ have unique application value in extreme environments.In the present
Metal oxide mesocrystals (MCs) and mesoporous single crystals (MSCs) exhibit superior carrier transport ability,high specific surface area,shortened photo-carri
The homogenized Mg-8.2Gd-3.8Y-1.0Zn-0.4 Zr (wt.%) alloy full of plate-shaped long period stacking ordered (LPSO) phases was hot extruded in the atmosphere and co
Fe-Al compounds possess a combination of high strength and corrosion resistance at high temperatures.However,increasing Al content to make them lighter results