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Photoluminescence: Applications01:14

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Variables Affecting Phosphorescence and Fluorescence01:26

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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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Luminescence thermometry, used in nanomedicine and microelectronics, is not immune to magnetic fields. This study shows specific transitions allow robust temperature sensing up to 20 T, offering solutions for challenging environments.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Spectroscopy

Background:

  • Luminescence (nano)thermometry offers remote temperature sensing in diverse fields.
  • A key advantage is its supposed immunity to strong electromagnetic fields.
  • This immunity is often assumed for lanthanide-based thermometers but lacks thorough experimental validation.

Purpose of the Study:

  • To critically examine the thermometric response of a specific terbium/europium-based luminescent thermometer under high magnetic fields.
  • To verify the claimed immunity of luminescent thermometers to electromagnetic interference.
  • To identify conditions and material properties enabling robust thermometry in magnetic fields.

Main Methods:

  • Investigated the luminescent molecular thermometer [Tb0.93Eu0.07(bpy)2(NO3)3] (bpy = 2,2'-bipyridine).
  • Tested its thermometric response under high magnetic fields up to 58 T.
  • Analyzed specific luminescent transitions for magnetic field correlation.

Main Results:

  • The conventional intensity-based method for Tb/Eu thermometers failed even under weak magnetic fields.
  • Specific luminescent transitions showed minimal magnetic correlation.
  • The thermometer operated effectively up to 20 T and at temperatures above 120 K in larger fields.

Conclusions:

  • The performance of luminescent thermometers is highly dependent on material properties and specific transitions.
  • The assumption of universal magnetic field immunity for lanthanide thermometers is challenged.
  • This research provides a pathway for developing robust luminescent thermometers for use in strong magnetic fields.