Luminescent properties of NaMg6SiO8:Eu3+, Tb3+ phosphor for W-LED applications

Abstract

A series of Eu³⁺ and Tb³⁺ ions doped (separately) with the NaMg₆SiO₈ silicate host were prepared by using the approach of solid-state reactions. At 617 nm (red) and 545 nm (green), the luminescent material showed strong brightness because of the electronic shifting of ⁵D₀ → ⁷F₂ (Eu³⁺) and ⁵D₄ → ⁷F₅ (Tb³⁺), respectively. Powder X-ray diffraction (PXRD) patterns and scanning electron microscopy (SEM) pictures were used to study the phase formation and morphological analysis of this phosphor. The CIE coordinates were used to determine its color. In order to investigate luminosity spectra, measurements were made of the excitation, PL characteristics, and luminescent decay time of the emission shifts of Eu³⁺ (⁵D₀ → ⁷F₂) and Tb³⁺ (⁵D₄ → ⁷F₅).