High pressure responsive luminescence of flexible Eu^(3+) doped PVDF fibrous mats  

作　　者：Carlos Hernandez San tosh K.Gupta Jose P.Zuniga Jorge Vidal Rene Galvan Hector Guzman Lilian Chavez Karen Lozano Yuanbing Mao 

机构地区：[1]Department [2]Department of Chemistry,University of Texas Rio Grande Valley,1201 West University Drive,Edinburg,TX 78539,USA [3]Radiochemistry Division,Bhabha Atomic Research Centre,Trombay,Mumbai,400085,USA [4]Department of Electrical Engineering,University of Texas Rio Grande Valley,Edinburg,TX 78539,USA [5]Department of Chemistry,Illinois Institute of Technology,3105 South Dearborn Street,Chicago,IL 60616,USA

出　　处：《Journal of Materials Science & Technology》2021年第7期103-111,共9页材料科学技术（英文版）

基　　金：the financial support by the National Science Foundation under PREM grant DMR 1523577;the IIT startup funds (YM);the United States-India Education Foundation (USIEF, India);the Institute of International Education (IIE, USA) for his Fulbright Nehru Postdoctoral Fellowship (Award# 2268/FNPDR/2017)。

摘　　要：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 Eu^(3+) source of Eu(NO_(3))_(3)·5H_(2)O(EN-PF) or Eu_(2)(SO_(4))_(3)(ES-PF) by a Forcespinning■ method. Microstructural analysis of these two systems indicates that Eu(NO_(3))_(3)·5H_(2)O and Eu_(2)(SO_(4))_(3) are homogeneously distributed and dispersed into the PVDF matrix. Fiber formation promotes a β-phase PVDF. Eu^(3+) 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 Eu^(3+) ions from both EN-PF and ES-PF with a different extent of changes. Specifically, Eu^(3+) 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 Eu^(3+) 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.

关 键 词：Polyvinylidene difluoride EUROPIUM Fiber High pressure LUMINESCENCE 

分 类 号：TQ342[化学工程—化纤工业]