Abstract
Spectroscopic properties of Sm3+ ion in borate based glasses (Li2OGd2O3-MO-B2O3 where MOBi2O3, BaO) have been investigated. Glasses are prepared by melt quenching technique and their properties are investigated using different techniques which include absorption, photoluminescence (PL), X-ray excited luminescence (XEL) spectra and decay rate analysis. Furthermore, other related physical and optical properties have been calculated. From absorption spectra the most intense and hyper sensitive transition is 6H5/2 → 6P3/2 at 403 nm. Under 403 nm excitation wavelength, four prominent emission peaks are observed at 563, 599, 645 and 707 nm. For Sm3+ ion the quenching points are observed at 2.0 and 1.5 mol% of LGBiBSm and LGBaBSm, respectively. Measured XEL spectra of the glass samples are found in agreement with that of PL emission spectra. The experimental decay rate follows non exponential behavior at higher concentrations and well fitted to the IH model for S = 6. The obtained color coordinates of the prepared glass matrix fall in the orange region of the CIE diagram. Comparing with LGBiBSm glass, LGBaBSm is transparent and exhibits long decay time value. Moreover, LGBaBSm shows high luminescence properties with excellent energy transfer from the host matrix to the luminescence center. On the basis of the observed properties of the developed glasses, it is expected that they will be best for the orange LEDs.
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