Luminescent Yttrium Oxide Nanosheets for Temperature Sensing

Accurate measurement of temperature is extremely critical in numerous fields and has drawn widespread concern nowadays. To meet the demand of temperature sensing in nanoscale optoelectronic devices, a series of quasi-two-dimensional square Y2O3 nanosheets were fabricated through a topological method with the co-doping of Bi3+ and Sm3+. The intensity of Sm3+ under 340 nm excitation was greatly enhanced, and multipeak spectra were obtained due to the energy transfer process. Moreover, the three peaks in temperature-dependent emission spectra exhibited different changing trends. The mechanism of luminescence and its temperature response behavior were explicated in detail before the attempt of further application. Such characteristic could generate three kinds of luminescence intensity ratio (LIR) to realize multimode temperature sensing, which owned higher accuracy compared to the single LIR technology. The relative sensitivity and repetition rate of the three modes were calculated, and the results were exceptional, indicating that the synthetic quasi-two-dimensional Y2O3: Bi3+, Sm3+ nanosheet can prospectively be applied to multimode nano temperature sensing in the future.