Abstract
30BaO2Ga2O3‒(27.8−x)B2O340SiO2xCe2O30.2Sm2O3(0 ≤ x ≤ 1) glasses were synthesized by conventional melting and quenching processes. The characterization of samples was performed using XRD, EDS, FTIR and Raman studies. Later, Optical absorption (OA) and photoluminescence (PL) spectral were recorded. X-ray diffraction pattern indicated amorphous nature of the samples. Raman and FTIR spectra have confirmed the presence of various, borate and silicate structural groups in the glass matrix. Structural modifications in glass matrix were clearly observed with variation of glass composition and increasing asymmetry led to depolymerisation of the glass structure. The absorption spectra exhibited nine absorption bands of Sm3+ ions in the vis–NIR regions excited from the ground stated 6H5/2. Additionally, a feeble band corresponding to 4f (2FJ) →5d (2A1g) absorption transition of Ce3+ ions (at 415 nm) is also observed in these spectra. Optical band gap (Eo) evaluated using Tauc plots is observed to decrease with Ce3+ concentration. PL emission of Sm3+ ions (recorded at λexc = 350 nm) in the co-doped glasses is observed to increase with increase of Ce2O3 content up to 0.6 mol%. The non-exponential decay curves are well fitted to I-H (Inokuti-Hirayama) model by S = 6, suggesting that the nature of the energy transfer between Ce3+→ Sm3+ in terms of dipole-dipole interaction. The CIE coordinates for 350 nm excitation of emission of 0.6CSm glass was observed to be exist in near white light region; hence these glasses may be considered for white LED's applications.
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