White light tuning and temperature sensing of NaLu(WO(4))(2):Ln(3+) up-converting phosphor

NaLu(WO(4))(2):Ln(3+) phosphors were synthesized via a hydrothermal method combined with subsequent calcination. Under excitation at 980 nm, 25%Yb(3+), 0.5%Tm(3+) and 25%Yb(3+), 1%Ho(3+)-doped phosphors produce blue, green and red emissions. Namely, NaLu(WO(4))(2):25%Yb(3+), 0.1%Ho(3+), 0.1%Tm(3+) nanocrystals show suitable intensities of blue, green, and red (RGB) emission, resulting in the production of perfect and bright white light with CIE-x = 0.3299 and CIE-y = 0.3293, which is very close to the standard equal energy white light illumination (x = 0.33, y = 0.33). Based on FIR theory, the temperature dependence of NaLu(WO(4))(2):20%Yb(3+), 1%Er(3+) was studied, and the maximum value of sensitivity was obtained as 1.38% K(−1) at 543 K, which is better than that of previously reported temperature-sensing materials. It proves that the NaLu(WO(4))(2):Ln(3+) phosphors have potential applications in white lighting, optical temperature measurement and other fields.