White light emitting diodes have attracted more attention due to their potential applications in extensive fields, such as device indicators, backlight, automobile headlights and general illumination.The present technical bottleneck is that the as-resulted white light is cool, which is lack of color richness.A red phosphor with stable chemical property and high luminescence intensity is considered to be used for near UV LEDs and to compensate the red deficiency of YAG:Ce.Double perovskite NaLaMgWO6:Eu phosphor as an excellent red phosphor could emit intense red light of 5D0→ 7F2 transition due to the low symmetry of La site.In addition, it exhibits structure ordering: long-range ordering of B-site cations (Mg/W) in a rock-salt fashion and layered ordering of A-site cations (Na/La) in AABBO6 lattice.This special structure leads to a longer distance between activator ions.Thus, the concentration quenching may be delayed or disappeared for many rare earth ions and a high luminescence enhancement is greatly expected.