Dual-color up-conversion luminescence and temperature sensing of novel Na3Y(VO4)2: Yb3+, Er3+ phosphor under multi-wavelength excitation

Abstract Multi-color up-conversion luminescence materials with broad emission range are scarce extremely due to the finite excitation wavelength, thin types of activators, and inappropriate emission levels. Yb3+, Er3+ dual-sensitized system is established in the text, green and red dual-color luminescence are successfully achieved in novel Na3Y(VO4)2:Yb3+, Er3+ phosphor. The phosphors show green luminescence under 980 nm excitation and high color purity red luminescence under 1550 nm excitation, a wide range of emission colors can be tuned by changing various concentration of Yb3+. The up-conversion luminescence properties and mechanisms of Yb3+, Er3+ co-doping phosphor under 980 and 1550 nm excitation are discussed in detail. Moreover, the temperature performance of the Na3Y(VO4)2:Yb3+, Er3+ phosphors are investigated based on Boltzmann-type population distribution theory. Temperature dependence of the two green emissions ratio of Er3+ is obtained and the maximum temperature sensing sensitivity is 6.7×10-3 K-1 at 406 K.