Novel red phosphors based on vanadate garnets for solid state lighting applications

A series of vanadate garnets with the composition BixLnyEu1−x−yNa2Mg2V3O12 (where Ln = Y, La, Gd; x = 0–0.4 and y = 0–0.2) were synthesized and their applications as red phosphors for solid state lighting were investigated. The phosphors show a broad charge transfer excitation that can be suitable tuned by the addition of Bi3+ to capture the UV radiation from InGaN LEDs. We have synthesized a range of compositions and performed structural and optical studies on the samples. In addition, the performance of the phosphors at higher temperatures has been evaluated and compared to a commercial standard.