Influence of Anion/Cation Substitution (Sr2+ → Ba2+, Al3+ → Si4+, N3– → O2–) on Phase Transformation and Luminescence Properties of Ba3Si6O15:Eu2+ Phosphors

A series of promising cyan, green, and yellow emission (Ba, Sr)3(Si, Al)6(O, N)15:Eu2+ phosphors were synthesized by a Pechini-type sol–gel ammonolysis method. Variations in luminescence properties and crystal structure caused by the modification of phosphor composition were studied in detail. The prefired temperatures of the precursors play a key role in the process of forming the final products. Under UV light excitation, the as-prepared Ba3Si6O15:Eu2+ phosphor presents a strong cyan emission located at 498 nm. Moreover, the as-prepared oxynitride phosphors, Eu2+-activated (Ba1–ySry)3Si6–xAlxO15−μNδ (x = 0–1.2, y = 0–0.6), display a broader excitation band covering the entire visible region. Under blue light excitation, Ba3Si6–xAlxO15−μNδ:Eu2+ phosphors show a intense and narrow green emission at 520 nm, and the luminescent intensity can be enhanced by increasing Al content within a certain range. However, (Ba1–ySry)3Si6O15−μNδ:Eu2+phosphors exhibit green (520 nm) to yellow (554 nm) emission with increa...