Optical and Band Gap Study of Violet-Blue Broadband Emitting Dy3+ Codoped Y2SiO5:Ce3+ Phosphor for nUV White Light-Emitting Diodes

Abstract

Y₂SiO₅:Ce³⁺, Y₂SiO₅:Dy³⁺, and Y₂SiO₅:Ce³⁺ and Dy³⁺ phosphors were successfully synthesized using the oxalate wet chemical method. Phase purity, emission and excitation spectra, FTIR, and the chromaticity coordinate were adopted to represent the performance of the samples. The photoluminescence (PL) spectrum Y₂SiO₅:Ce³⁺ and Dy³⁺ phosphor shows a broadband in violet-blue region with a bandwidth of nearly 75 nm due to combine effect of Ce³⁺–Dy³⁺ ions with another emission peaks of Dy³⁺ ions peaking at 574 nm. It has been discussed how the Ce³⁺–Dy³⁺ ion pair enhances the PL intensity of violet-blue light through efficient energy transfer (ET). The chromaticity coordinate of Y₂SiO₅:Ce³⁺ _{(1 mol%)}, Dy³⁺ _{(0.3 mol%)} phosphors is 𝑥 = 0.167 and 𝑦 = 0.034. The CCT value is used to find color temperatures. The energy band gap and refractive index of Y₂SiO₅:Dy³⁺ are determined using the bonding parameter and Tauc's plot. Prepared phosphors might be an excellent choice for lighting applications based on all of the findings.