Dual-mode fluorescence intensity ratio temperature measurement based on Dy3+ doped boroaluminosilicate glass

Non-invasive optical thermometer based on fluorescence intensity ratio ( FIR ) technology has a good market prospect. Herein, we reported Dy 3+ doped boroaluminosilicate glass and established dual-mode temperature sensing models by FIR . The X-ray diffraction patterns, differential scanning calorimetry and fourier transform infrared spectra were used to investigate the structure of glass sample. Besides, the transmittance spectra reveal that all samples have good transparency, which implies good light output capacity. Excited by 349 nm, the intensities of emission peaks at 454, 482, and 575 nm show different trend with increasing temperature (303–573 K). The maximal relative sensitivity reaches 1.72 %K −1 (I 482 /I 575 ) and 1.62 %K −1 (I 454 /I 575 ) at 303 K, respectively. The results surpass that of FIR thermometry based on Er 3+ doped systems. The reason is that the efficient energy gap of 4 I 15/2 level and 4 F 9/2 level of Dy 3+ ions is higher than that of Er 3+ ions. These results suggest that Dy 3+ doped boroaluminosilicate glasses are expected to be applied in optical temperature sensing field.