Structure and Luminescence Studies of a Ce 3+ -Activated Ba 5 La 3 MgAl 3 O 15 Green-Emitting Phosphor.

Novel green-emitting Ba 5 La 3 MgAl 3 O 15 :Ce 3+ (BLMAO:Ce 3+ ) is successfully obtained by a solid-state reaction. In this study, BLMAO, which is inspired from the Ba 6 La 2 A 1.5 Fe 2.5 O 15 crystal structure, shows a green emission approximately peaked around 500 nm under near-ultraviolet light excitation at 412 nm by Ce 3+ doping. Moreover, internal and external quantum efficiencies of BLMAO:0.02Ce 3+ are found to be 27 and 22%, respectively. The emission peak deconvolution and Dorenbos model calculation reveal that the Ce 3+ ion occupies on two different crystallographic sites. The potential of BLMAO:Ce 3+ for phosphor-converted white LEDs (pc-wLEDs) is systematically evaluated from the results of Rietveld refinement and luminescence measurement.