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Influence of nano-sized defects on PL efficiency of Er3+ ions co-doped with Au2 O3 in lead boroselenate glass ceramic system- A novel approach using PAL spectroscopy.

This study consists of the results of investigation on the influence of the free volume space (fv ) defects on luminescence efficiency (LE) of erbium ions in Au2 O3 doped PbO-B2 O3 -SeO2 (PBS) glass ceramics. Glass ceramics containing fixed concentration of Er3+ ions and varied concentrations of Au2 O3 were synthesized. XRD studies indicated that the samples contain Au2 (SeO3 )3 crystalline phase and nano gold metallic particles (MPs). The concentration of defects entrenched in glass-ceramics estimated in terms of Au2 O3 content using positron annihilation lifetime spectroscopy (PALS) measurement indicated the highest in the glass ceramic containing 0.075 mol% of Au2 O3 . Optical absorption (OA) and the photoluminescence (PL) spectra of the glass-ceramics were studied in the visible region. Observed increase of PL efficiency is attributed to the enhanced concentration of free volume imperfections in the samples. A perfect correlation could be achieved between free volume fraction and the PL efficiency of erbium ions in these glass ceramics.