Wide-Range Thermometry at Micro/Nano Length Scales with In₂O₃ Octahedrons as Optical Probes

Abstract

We report the temperature-dependent photoluminescence and Raman spectra of In2O3 octahedrons synthesized by an evaporation-condensation process. The luminescence obtained here is due to the defect-related deep level emission, which shows highly temperature-dependent behavior in 83-573 K range. Both the position as well as the intensity varies with temperature. Similarly, Raman spectroscopy in 83-303 K range shows temperature-dependent variation in peak intensity but no change in the peak position. Interestingly, the variation of intensity for different peaks is consistent with Placzek theory which invokes the possibility of temperature sensing. We demonstrate the reversibility of peak intensity with temperature for consecutive cycles and excellent stability of the octahedrons toward cryogenic temperature sensing. Overall, both the temperature-dependent photoluminescence and Raman spectra can be explored to determine temperature in the cryogenic range at micro/nano length scales. As an example, we evaluate the temperature-dependent Raman spectra of WO3 that undergoes a phase transition around 210 K and temperature-dependent luminescence of Rhodamine 6G (Rh6G) where intensity varies with temperature.

Temperature-Dependent Photoluminescence of g-C3N4: Implication for Temperature Sensing

“…21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 18 TOC g-C3N4 as optical probe for temperature sensing …”

“…Temperature-dependent photoluminescence (PL) of a semiconductor is of paramount importance as it can be explored for temperature sensing, [17][18][19][20][21][22][23][24] evaluation of activation energy for thermal quenching/population, [25][26][27][28] variation of energy gap with temperature, etc. [17][18][19][20][21][22] Recently, various materials such as QDs, 29,30 rare earth-doped oxides, 31,32 dyes, 33,34 etc.…”

“…[17][18][19][20][21][22] Recently, various materials such as QDs, 29,30 rare earth-doped oxides, 31,32 dyes, 33,34 etc. have been explored for PL based temperature sensing.…”

Ultrahigh-sensitive optical temperature sensing based on quasi-thermalized green emissions from Er:ZnO

“…[9][10][11] Among various optical thermometers, temperature induced change in different fluorescence parameters such as emission intensity, fluorescent intensity ratio (FIR), peak position, peak width, life time, etc. [12][13][14][15][16][17] have been widely explored. In the case of temperature dependence luminescence intensity, it is always desirable to consider the ratio of two different peak emissions rather than single intensity variation, to circumvent numerous undesirable factors such as the variation of probe concentrations, optoelectronic drift, etc.…”

Fabrication of In2O3/ZnO@Ag nanowire ternary composites with enhanced visible light photocatalytic activity

“…[18][19][20][21] The formation of type II heterostructures has been recognized as an attractive route to overcome the limitations of ZnO because it promotes efficient charge separation, enlarges the effective contact interfaces, and improves the optical absorption. 22,23 In the binary system, the relatively narrow region of visible light response and relatively lower separation efficiency of electron-hole pairs limit its practical applications. Ternary system construction composites have been extensively investigated via introduction of an additional constituent, such as Ag, Au, carbon, and graphene oxide (GO), to the binary heterojunction.…”