Thermal-induced local phase transfer on Ln3+-doped NaYF4 nanoparticles in electrospun ZnO nanofibers: Enhanced upconversion luminescence for temperature sensing. Issue 10 (1st August 2016) - Bao, Y.N.
Abstract: NaYF4 :Yb 3+, Er 3+ /ZnO composite nanofibers have been prepared using the electrospinning method. A phase transfer process from α to β of NaYF4 occurred after calcination treatment, which provided a simple and effective way to enhance the upconversion luminescence of the nanosized NaYF4 :Yb 3+, Er 3+ . The up-conversion emission intensity of the NaYF4 :Yb 3+, Er 3+ /ZnO composite nanofibers increased with an increase in the sintering temperature. The fluorescence intensity ratio (FIR) technique, based on the green up-conversion emissions of the NaYF4 :Yb 3+, Er 3+ /ZnO composite nanofibers, has been studied as a function of temperature. In the temperature range of 300–650 K, the maximum sensitivity and temperature resolution is approximately 0.0049 K −1 and 0.3 K, respectively, which indicates that NaYF4 :Yb 3+, Er 3+ /ZnO is a promising material for applications in optical temperature sensing.