Microwave-assisted fabrication of Sr2ZnMoO6:Sm2O3 phosphors in TeO2: ZnO: B2O3 glass matrix for high-efficiency solid-state lighting applications

Abstract

The present work focuses on synthesizing Sr2ZnMoO6:Sm2O3 phosphor-mixed TeO2: ZnO: B2O3 glass by microwave synthesis technique at different times (16, 18, 20, 22, 24 min). These samples, after synthesizing they were characterized through XRD, FTIR, density, molar volume, refractive index, absorption spectra, luminescence properties, and lifetime analysis.The study of crystalline nature was studied using XRD spectra of Sr2ZnMoO6. Absorption spectra were evaluated in the wavelength region between 400 and 1800 nm and found seven peaks, which corresponded with the energy transitions of Sm3+ion from the ground level of 6H5/2 → 6F11/2, 9/2, 7/2, 5/2, 3/2, 6H15/2, and 6F1/2 at 944, 1083, 1238, 1383, 1485 and 1543 nm respectively. The photoluminescence in the wavelength region of 500–750 nm using the excitation wavelength at 403 nm. The emission intensity of the samples increased with sintering time until 20 min after which it decreased. The highest peak was observed at 597 nm, corresponding to 4G5/2 → 6H7/2 (orange) transitions of Sm3+ ion. The luminescence lifetime from the 4G5/2 to 6H7/2 level increased with increasing sintering time until 20 min, which had a lifetime of 0.431–0.711 ms when monitored at λex = 403 nm. The results obtained in photoluminescence properties showed that the samples could be potential candidates for orange light-emitting diodes for solid-state lighting applications.