Analysis of Ga<sup>3+</sup>/Sc<sup>3+</sup> Substitution on Luminescence Property of LuAG∶Ce<sup>3+</sup> Transparent Ceramics

Abstract：LuAG∶Ce 3+ is an efficient and stable commercial green phosphor-converted material.Two series of Lu 3 Al 5-x M x O 12 ∶Ce 3+ transparent ceramics(TCs)doped with Ga 3+ /Sc 3+ ions were fabricat• ed by vacuum sintering.The effects of doping ions and their concentration on crystal structure，fluo• rescence properties，and thermal stability were investigated.Both Ga 3+ and Sc 3+ doped LuAG∶Ce 3+ samples exhibit a blue-shift under 450 nm blue light excitation.Significantly，Ga 3+ doped samples have more effective spectral modulation，and the emission spectrum shifts from 536 nm to 506 nm when Ga 3+ concentration increases from 0% to 20%.Meanwhile，it is found from temperature-depen• dence spectrum and quantum yield characterization that Ga 3+ doped ions have less impact on thermal stability of LuAG∶Ce 3+ ceramics.By encapsulating the ceramic samples on 3 W blue LED chips， green light sources with various spectra were obtained.Among them，Ga 3+ doped LuAG∶Ce 3+ sam • ples show better color tunability and maintain higher light efficiency.In summary，Ga 3+ doped LuAG ∶ Ce 3+ ceramic is a promising green phosphor-converted material.