Luminescence Efficiency of Sm3+ Ions in Hafnia Added Lithium Silicate Glass System-the Impact of Au0 Particles

In this study, Li2O-HfO2-SiO2-Sm2O3-Au(2)O(3 )glasses (doped with fixed concentration of Sm2O3 and varied con-tents of Au2O3) were synthesized and characterized. The role of Au-0 particles on improvisation of red emission of Sm3+ ions was investigated. Optical absorption (OA) spectra of these glasses indicated a number of bands excited from H-6(5/2) of Sm(3+ )ions. A broad band in the greenish-yellow spectral region due to surface plasmon resonance (SPR) of Au(0 )nanoparticles was also detected in these spectra. Photoluminescence (PL) spectra of (Sm free glasses) embedded with Au-0 metallic particles (MPs) showed a wide band in the visible region ascribed to the transition of electrons from sp -> d energy bands. Luminescence spectra of Sm(3+ )doped glasses revealed bright orange and red emission bands with substantial increased intensities with increased concentration of Au2O3. Effect of Au(0 )MPs on the red emission efficiency of Sm3+ ions was emphasized with kinetic rate equations.