Ca1-xMo1-ySiyO4:Eux3+ :: A novel red phosphor for white light emitting diodes

Single phase of Ca1-xMo1-ySiyO4:Eu-x(3+) (0.18 <= x <= 0.26, 0 <= y <= 0.04) was synthesized by solid-state method. The photoluminescence investigation indicated that Ca1-xMo1-ySiyO4:Eu-x(3+) (0.8 <= x <= 0.26) could be effectively excited by 393 and 464nm, and it exhibited an intense red emission at 615nm. The introduction of Si4+ ions did not change the position of the peaks but strongly enhanced the emission intensity of Eu3+ under 393 and 464nm excitations and showed very good color purity. The emission intensity of optimal Ca0.8Mo0.98Si0.02O4:Eu-0.2(3+) sample (excited by 393nm) was about 5.5 times higher than that of the phosphor Y2O2S:0.05Eu(3+). So this phosphor could be nicely suitable for the application of the UV LED chips. (C) 2007 Elsevier B.V. All rights reserved.