Visible and near-infrared luminescence properties of Nd³⁺/Yb³⁺ co-doped Gd₂O₃ phosphors for highly sensitive optical thermometry

Abstract

Phosphors with rare earth (RE) ions are widely applied to optical temperature measurement. Moreover, the near-infrared (NIR) emission of phosphor has potential applications at biological field. Herein, the Gd2O3:xNd3+/Yb3+(0.02 ≤...

Regulating the upconversion luminescence properties of Tm3+/Yb3+-codoped ZrScW2PO12 microparticles with a negative thermal expansion effect through thermal stimulation for optical thermometry

“…As a consequence, the R values for the I 700 / I 475 and I 700 / I 650 combinations are determined to be 94.7% and 95.4%, respectively. Furthermore, the temperature uncertainty (δ T ) is another figure of merit in the analysis of performance of optical thermometers, and the following expression can be applied to estimate the mentioned δ T values: 46,47 where the uncertainty of determination of the LIR parameter is expressed as δLIR. Accordingly, in terms of the I 700 / I 475 and I 700 / I 650 combinations, their δ T values are revealed to be 0.006–0.338 and 0.021–0.404 K, respectively, over the whole temperature range ( i.e.…”

“…As a consequence, the R values for the I 700 /I 475 and I 700 /I 650 combinations are determined to be 94.7% and 95.4%, respectively. Furthermore, the temperature uncertainty (δT ) is another figure of merit in the analysis of performance of optical thermometers, and the following expression can be applied to estimate the mentioned δT values: 46,47 δT…”

Simultaneously tuning the luminescent color and realizing an optical temperature sensor by negative thermal expansion in Sc2(WO4)3:Tb/Eu phosphors

“…[1][2][3] In this context, the luminescence intensity ratio (LIR) approach has emerged in noncontact optical thermometry. [4][5][6] It focuses on exploring the temperaturedependent luminescence intensities of two thermally coupled levels (TCLs) found in rare-earth (RE 3+ ) ions (Er 3+ : 2 H 11/2 / 4 S 3/2 ; Tm 3+ : 3 F 3 / 3 H 4 ; Nd 3+ : 4 F 5/2 / 4 F 3/2 ). [7][8][9] Despite their promise, TCLs suffer from an inherent limitation: a small energy gap (200-2000 cm −1 ), leading to unsatisfactory relative sensitivities.…”

Enhancing NIR‐II Upconversion Monochromatic Emission for Temperature Sensing

“…[26,27] Yb 3+ ions usually act as the sensitizers which absorbed the NIR emission (980 nm) and emit visible or NIR-I emission. [28,29] A few articles have reported the temperature sensing UCNPs under excitation in the 1480-1550 nm range. [30,31] The application of UCNPs in low temperature sensing with both emission band and excitation band in the NIR-II has not been studied.…”