Abstract
The range of emission cross-section in RE3+ ions play a key role in developing optical systems with high performance. The present work focuses on mid infrared and visible emission properties of Er3+/Ho3+ions in sodium-sulfo lead phosphate (GExHy) glasses. The EDS, XRD and FTIR spectra were performed for basic structural analysis. Besides, DC (down-conversion) and UC (up-conversion), photoluminescence (PL) spectra of the prepared GExHy glasses pumped at 379 nm and 980 nm are investigated. The favourable concentration of Ho2O3 was estimated from the analysis of NIR PL spectra for Ho3+: 2.0 μm and Er3+: 1.5 μm. In GExHy glasses, the increase in intensity near 2.0 μm with decrease in intensity at 1.5 μm infers to energy transfer process between Er3+ and Ho3+ ions. The maximum energy transfer efficiency of GExHy samples is 75.5% and with the increase of Ho3+ ions, the lifetime decay has been reduced from 5.06 ms to 1.24 ms. The absorption and stimulated emission cross-section of Er3+:1.5 μm and Ho3+: 2.0 μm were calculated. Moreover, FWHM×σemi was calculated for Ho3+:5I7→5I8 transition to estimate the probable MIR laser emission. The CIE color coordinates were estimated from both DC and UC PL spectra. All the results indicated that the prepared GExHy glasses have promising material applications in mid-infrared solid-state lasers and telecommunications.
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