Wide range color tunability and efficient energy transfer of novel NaCaGd(WO4)3:Tb3+,Eu3+ phosphors with excellent thermal stability for pc-WLEDs

The CIE chromaticity diagram of NCGW:0.6Tb 3+ , y Eu 3+ ( y = 0–0.4) phosphors assigned to 1–8 along with the corresponding digital photograph excited by 254 nm light and the normalized intensity of the NCGW:0.6Tb 3+ ,0.1Eu 3+ phosphor at various temperatures.