SrAl2O4: Eu2+, Dy3+ Long Afterglow Phosphor and Its Flexible Film for Optomechanical Sensing Application

摘要: Mechanoluminescence is an unusual phenomenon in which a material emits electromagnetic radiation due to any deformation caused by mechanical force. In the present study, highly flexible mechanoluminescent films of SrAl2O4:Eu2+,Dy3+ have been prepared by incorporating phosphor in a poly(vinyl alcohol) hydrogel using optimized ratios of dimethyl sulfoxide (DMSO):water as solvents. Upon introducing DMSO as a solvent along with water, flexibility and mechanical properties such as tear resistance and hardness of hydrogel were enhanced to a large extent. Samples prepared with DMSO:water (80:20 wt %) exhibit a higher tensile strength of 13.4 MPa, elongation strain of about 620%, and higher transparency. This hydrogel transmits enough energy to SrAl2O4:Eu2+,Dy3+ upon mechanical impact. For the proof of concept, mechanoluminescence (ML) testing was done, and it was found that the emission …