Temperature sensor based on the Er3+ green upconverted emission in a fluorotellurite glass

Upconversion based temperature sensing ability of Er3+–Yb3+codoped SrWO4: An optical heating phosphor

“…In such types of sensors, the temperature is measured by evaluating the change in luminescence observed from two closely spaced levels of the emitting centres of a material [13]. The energy difference between these two closely spaced levels must be in the range of 200 to 2000 cm -1 [14]. The technique used to determine the temperature corresponding to the variation in fluorescence emission of the thermally coupled levels is known as a Fluorescent intensity ratio (FIR) technique [10,12].…”

Temperature-Sensing Behavior Based on Upconversion Luminescence at the Rhombohedral–Tetragonal Phase Boundary

“…For comparison, the theoretical maximum value S R and corresponding temperature for other Er 3+ -doped materials in the literature, which include oxides, fluorides and glasses, are also shown in Table I. [24][25][26][27][28] Here, the maximum S R (0.0037 K À1 ) is obtained for KNNE ceramics, which is similar to other Er 3+ -doped materials. Thus, it can be concluded that the KNNE ceramics have great potential for the development of temperature sensors.…”

Up-conversion luminescent properties and optical thermometry of LaMgAl11O19: Yb3+/Er3+ phosphors

“…The sensitivity of the optical temperature sensor is defined as the rate that R varies with temperature. The temperature sensitivity S can be defined as follows [38,39]: Fig. 7 exhibits the corresponding sensor sensitivity as a function of the temperature.…”