Realizing enhanced down-conversion photoluminescence and Judd–Ofelt parameters of novel reddish-orange emitting KBaScSi3O9:xSm3+ silicate phosphors

Abstract

A new series of reddish-orange emitting KBaScSi3O9:Sm3+ phosphors prepared by a solid-state reaction method. The X-ray diffraction study confirmed the single phase of monoclinic structure. The Ω2, Ω4 and Ω6 parameters were estimated for silicate phosphors, from the absorption spectra using Judd-Ofelt theory. Photo-luminescence spectra exhibit four emission bands under the excitation at 403 nm. The radiative parameters were predicted from luminescence spectra for the prepared phosphors to check their applicability in lasing and photonic applications. However, the KBSS:0.06Sm phosphor shows higher luminescence intensity when compared to other studied phosphors and the same can be used as a potential candidate for devices emitting in the reddish-orange zone. The decay spectra traced for silicate phosphors have been used to calculate the experimental lifetimes and inter-related further with radiative lifetimes to determine the luminescence quantum efficiency.