Structure and Luminescence Studies of a Ce3+-Activated Ba5La3MgAl3O15 Green-Emitting Phosphor

Novel green-emitting Ba₅La₃MgAl₃O₁₅:Ce³⁺ (BLMAO:Ce³⁺) is successfully obtained by a solid-state reaction. In this study, BLMAO, which is inspired from the Ba₆La₂A_1.5Fe_2.5O₁₅ crystal structure, shows a green emission approximately peaked around 500 nm under near-ultraviolet light excitation at 412 nm by Ce³⁺ doping. Moreover, internal and external quantum efficiencies of BLMAO:0.02Ce³⁺ are found to be 27 and 22%, respectively. The emission peak deconvolution and Dorenbos model calculation reveal that the Ce³⁺ ion occupies on two different crystallographic sites. The potential of BLMAO:Ce³⁺ for phosphor-converted white LEDs (pc-wLEDs) is systematically evaluated from the results of Rietveld refinement and luminescence measurement.