CdSe-Based Quantum Dots as In Situ Pressure and Temperature Non-intrusive Sensors in Elastohydrodynamic Contacts

Laser-Induced Heating in GdVO4: Yb3+/Er3+ Nanocrystals for Thermometry

“…An ester-based oil (Nycobase 5750) was chosen as a fluid medium to apply GdVO 4 : Yb 3+ /Er 3+ nanoprobes for tribological temperature measurement . Nycobase oil is used as a basic lubricant because of its properties: rheological, high thermal resistance, chemical stability, and nontoxicity.…”

“…An ester-based oil (Nycobase 5750) was chosen as a fluid medium to apply GdVO 4 : Yb 3+ /Er 3+ nanoprobes for tribological temperature measurement. 12 Nycobase oil is used as a basic lubricant because of its properties: rheological, high thermal resistance, chemical stability, and nontoxicity. The nanoprobes can also be dispersed in solid media to explore their potential application in optical thermometry for local temperature measurement, such as measuring the local temperature of the near-surface layer of a solid in tribology.…”

“…2−9 These advantages have led to a wide range of applications in various fields such as micro/ nanoelectronics, integrated photonics, 6 biology for thermal therapies, 7,10 or more recently tribology for temperature measurement in a lubricated contact. 11,12 By using the photoluminescent materials, we can use their emission intensity, 11,12 lifetime, 13 spectral width, spectral shift, and so forth 2 to measure the temperature. The method of ratiometric luminescence based on the Boltzmann distribution 14 is well known as a self-referenced measure: [2][3][4][5][6][7][8][9]15,16 the population of thermally coupled levels (TCLs) varies differ-ently with temperature, and then the temperature dependence of the emission intensity ratio can be calibrated for use in thermometry.…”

“…The successful development of these new devices requires new and powerful techniques to characterize them . One of the crucial parameters to characterize in miniaturized devices is temperature, and for this reason, nanothermometry has been widely developed in the last decade. − Among the current methods for temperature sensing, luminescence thermometry is considered a promising method to reliably acquire temperature in a noncontact configuration with high sensitivity and accuracy. − These advantages have led to a wide range of applications in various fields such as micro/nanoelectronics, integrated photonics, biology for thermal therapies, , or more recently tribology for temperature measurement in a lubricated contact. , …”

“…By using the photoluminescent materials, we can use their emission intensity, , lifetime, spectral width, spectral shift, and so forth to measure the temperature. The method of ratiometric luminescence based on the Boltzmann distribution is well known as a self-referenced measure: − ,, the population of thermally coupled levels (TCLs) varies differently with temperature, and then the temperature dependence of the emission intensity ratio can be calibrated for use in thermometry.…”