Double perovskite structured Ca2MgWO6:Sm3+ nanophosphor: Tailored for future-generation WLEDs and dosimetry applications

Abstract

In fast-growing technologies, the development of innovative materials which can be used in multiple applications to fulfill the present necessary needs is highly motivated. Hence, in the present work, amber red-emitting double perovskite structured Sm3+ ions-doped Ca2MgWO6 nanophosphors were synthesized via the solution combustion route. The structural studies confirm the monoclinic crystal phase of the prepared nanophosphors. The energy band gap of the prepared nanophosphors was estimated and found to be ∼ 3.86 – 3.97 eV. The photoluminescence emission spectra showcase three intense and sharp peaks centered at ∼ 570, 603, and 645 nm, which ascribed to the 4G5/2 → 6H5/2, 4G5/2 → 6H7/2 and 4G5/2 → 6H9/2 transitions of Sm3+ ions, respectively. The photometric properties of the nanophosphors revealed amber-red region emission with ∼ 99.9% of chromatic purity. Thermoluminescence glow curves of the synthesized nanophosphors after irradiation of 10 KGy doses of γ-rays exhibit clear distinctive peaks at ∼ 140, 232, and 264 °C, which ascribed to increased luminescent trapping levels and defect population. The thermoluminescence linear response of the Ca2MgWO6:Sm3+ (3 mol%) nanophosphors within a wide range of 0.1–10 KGy of γ- ray doses are noticed. The various kinetic and trapping parameters were estimated via the computerized glow curve deconvolution method. The aforementioned results revealed that the prepared nanophosphors can be used for both future-generation white light-emitting diodes and dosimetry applications.