Photoluminescence properties of M3+ (M3+Â =Â Bi3+, Sm3+) activated Na5Eu(WO4)4 red-emitting phosphors for white LEDs

► Na5Eu(WO4)4:(Bi3+, Sm3+) phosphors were synthesized by solid-state reaction method. ► Bright red light can be observed from Na5Eu(WO4)4:(Bi3+, Sm3+) under 395 nm or 465 nm excitation. ► The crystal structure and parameters of the samples were refined by the Rietveld method. ► Na5Eu0.8Bi0.2(WO4)4 and Na5Eu0.96Sm0.04(WO4)4 phosphors bear with 59.6% and 53.3% QE.