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In order to obtain the maximum green up-conversion luminescence intensity of Ho 3+ /Yb 3+  co-doped YNbO 4 , a uniform design and a quadratic general rotation combination design were applied to optimize the doping concentration. The concentration of the rare earth corresponding to the strongest green luminescence intensity was determined to be 10% Ho 3+ /34.9% Yb 3+ . Maximum luminous intensity of green light tested under 980 nm excitation was 157373.266, which was close to the theoretical calculated integral intensity value of 157290.825. The variation of the up-conversion luminescence spectra at different power density of the 980 nm laser was characterized. According to the formula fitting, the up-conversion luminescence process is a two-photon process. Meanwhile, the temperature sensing characteristic of the samples has been discussed. Finally, the CIE coordinates were analyzed and calculated to be (0.297, 0.692).

Experimental optimization design synthesis and up-conversion luminescence properties of YNbO 4 :Ho 3+ /Yb 3+