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

A series of vanadate garnets with the composition Bi(x)Ln(y)Eu(1) (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. (c) 2008 Elsevier B. V. All rights reserved.