A promising red-emitting phosphor Li2Eu4(MoO4)7 prepared by sol gel method

A series of red light-emitting phosphors Li2Y4-x(MoO4)(7):xEu(3+) were synthesized by a sol-gel method. These samples were characterized by DSC-TGA, XRD, PL and FE-SEM analysis. The best dosage of citric acid is four times of metal ions. The optimal sintering temperature is 900 degrees C. The luminescence intensity of Li2Y4-x(MoO4)(7):xEu(3+) are strongest when the doping concentration of Eu3+ is 4 mol. These phosphors can be excitated by near-UV light of 395 nm and blue light of 465 nm effectively, and show strong red light at 615 nm, which is corresponding to D-5(0) -> F-7(2) transition of Eu3+ ion. The CIE chromaticity coordinates of Li2Eu4(MoO4)(7) phosphor is calculated to be (0.6497, 0.3499), and its lifetime is 0.38 ms. The results show that the phosphor is a promising red component candidate for near-UV and bule LED application. (C) 2016 Elsevier Ltd. All rights reserved.