Abstract
Photoluminescence spectra and kinetics have been studied for finely dispersed powders of such luminophores as SrAl2O4:(Eu2+,Dy3+) and Sr4Al14O25:(Eu2+,Dy3+,B). Several lasers with different wavelengths (λ = 355, 404, 440 and 530 nm) were used for the excitation of photoluminescence. The photoluminescence of the materials is revealed to occur in a long-wave spectral range from 550 to 750 μm, which indicates the presence of energy levels, the radiative transitions between which form the radiation spectrum. The structure of the powders has been studied using a scanning electron microscope. It is established that the powder consists of microparticles (granules) up to 100 μm in size with a grain size up to 25 μm. According to the results of studies on the mechanoluminescence of SrAl2O4:(Eu2+,Dy3+) and Sr4Al14O25:(Eu2+,Dy3+,B) powders, it is concluded that the mechanoluminescence is excited via an activation of traps when they interact with the electric fields of moving grain-boundary dislocations in the course of intergranular slipping during the deformation of microparticles under an impact load.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
