Optical spectroscopic and thermal quenching behaviour of perovskite SrTiO3:Sm3+ orange emitting phosphors for lighting applications

Abstract

The Sm3+ ions activated perovskite SrTiO3 phosphors were successfully synthesized by the facile solid-state reaction method. The performance of Sm3+ ions doped into the SrTiO3 on the structural, optical and thermal quenching behaviours were investigated in detail. The XRD, FESEM, photoluminescence, decay time analysis and UV–Visible spectroscopy were employed to characterize the prepared phosphors. The XRD analysis reflects that prepared phosphors having the cubic structure with space group Pm3m (221). Under the 382 nm (6H5/2 → 4L17/2) effective UV excitation, perovskite Sr(1−x)TiO3:x Sm3+ phosphors exhibited an intense orange emission at 600 nm credited to the hypersensitive 4G5/2 → 6H7/2 transition. From the temperature dependent photoluminescence emission spectra of optimized Sr(0.94)TiO3:0.06Sm3+ phosphors, the activation energy (∆E) was found to be 0.096 eV for the thermal quenching of phosphors while the integrated emission intensity of optimal Sr(0.94)TiO3:0.06Sm3+ phosphors retained 75% at 450 K in comparison to intensity observed at 300 K. Furthermore, the chromaticity color co-ordinate and correlated color temperature ~ 3235 K showed stable and excellent warm light emission through the Sr(0.94)TiO3:0.06Sm3+ phosphors. Therefore, the obtained experimental results suggested that the perovskite Sr(1−x)TiO3:xSm3+ phosphors are very promising and potential candidate in the application of solid-state lighting.