Er3+/Ho3+ codoped nanogarnet as an optical FIR based thermometer for a wide range of high and low temperatures

A novel optical thermometry strategy based on emission of Tm3+/Yb3+ codoped Na3GdV2O8 phosphors

“…Furthermore, the intensity of anti-stokes luminescence is proportional to the excitation pump power, which is critical for understanding the UC mechanism. According to theory, the integral intensity I of the UC emission bands depends on the excitation power P as: 31,32 I = P n where n is the number of absorbed infrared photons required for the emission of one visible or infrared photon in the range of unsaturated UC luminescence. The dependences of the logarithm of the integral intensity I of the emission bands on the logarithm of the excitation power P of the laser excitation were determined to identify the mechanism of photon activation during the UC process.…”

“…The resolution limit is connected to thermometer performance, but it is also affected by the experimental setup. 3,32 As a result, utilizing improved acquisition methods as well as improving measurement performance, such as extending integration time and using the average of successive measurements to reduce experimental noise might be one option to enhance the resolution limit. To determine the limit of detection, 100 measurements were performed at room temperature under similar conditions for Tm 3+ /Yb 3+ co-doped NGVO, and the results are presented in the histograms shown in Fig.…”

Synthesis and optical spectroscopy of Na3Y(VO4)2:Eu3+ phosphors for thermometry and display applications

“…Furthermore, the absolute sensitivity ( S a ) and relative sensitivity ( S r ) may be calculated using the formula below. 15,49,50 …”

“…11,12 Highly sensitive thermometers are in great demand in a range of sectors such as nanomedicine, integrated photonic devices, microfluidics, and nanoelectronics. 7,13–15 The luminescence intensity ratio (LIR) temperature measuring strategy is to calibrate the temperature using the relative emission peaks ratio. 16 The fluorescence intensities ratio of multiple thermal coupling energy levels in a single light-emitting center is the standard LIR temperature measuring method.…”

Deep red upconversion photoluminescence in Er3+‐doped Yb3Ga5O12 nanocrystalline garnet

“…Garnets doped with RE and/or TM ions are intensively studied for fluorescence 13 or persistent luminescence 14 generated via anti‐Stokes (upconversion) or Stokes processes 15 . In contrast to microcrystalline garnets, prepared by direct synthesis, the nanocrystalline garnets with high surface‐to‐volume ratio may be utilized as contrast agents in bioimaging, 16 sensors and detectors, 17,18 high‐resolution displays, 19 emergency signage, 20 and solid‐state lasers 21 . Upconversion photoluminescence (UCPL) emission with emission color tunability in nanocrystalline garnets is a subject of many studies 22–24 .…”