Thermally boosted upconversion luminescence and high-performance thermometry in ScF3:Yb3+/Tm3+ nanorods with negative thermal expansion

Thermal imaging study of Sm2+ doped SrB4O7 based on time-resolved technology

“…The relative sensitivity is 7.64% K −1 at 500 K while it reaches 9.67% K −1 as the temperature increases to 533 K. This is an excellent sensitivity value for temperature sensing materials, compared with recently reported results (Table 1). 22–27 Furthermore, using the total intensity of the sample rather than a specific wavelength range greatly increases the signal intensity because no signal is likely lost due to wavelength selection. The high sensitivity and excellent signal quality of this method make it promising in thermal sensing applications.…”

Engineering Visible to Near-Infrared Luminescence through a Selective Doping Strategy for High-Performance Temperature Sensing

“…where W n (0) and W n (T) are the nonradiation transition rates at temperature 0 and T K, respectively, hν represents the phonon energy, k is the Boltzmann constant, and ΔE is the energy gaps involved. Analysis by Fourier transform infrared spectroscopy in previous work 36,37 meant that the dominant phonon energy of the ScF 3 host is about 516 cm −1 , whereas the ΔE of 5 I 6 and 5 I 7 is about 3450 cm −1 . Based on the energy gap law, when the ΔE in the activator exceeds 5 times the vibrational frequency of the host, the occurrence of nonradiative transition processes is rare, thus explaining the particularly weak red emission observed in ScF 3 :18%Yb 3+ , 1% Ho 3+ nanocrystals.…”