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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

891
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...
891

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Synthsis and characterization of Tb3+/Eu3+ complexes based on 2,4,6-tris-(4-carboxyphenyl)-1,3,5-triazine ligand for

Hongwei Wang1, Sha Jiang1, Lin Xiang1

  • 1School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, PR China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|September 6, 2020
PubMed
Summary

New lanthanide metal-organic frameworks using TCTZ ligands show excellent temperature sensing capabilities. These materials demonstrate high sensitivity and color-changing properties, making them promising for luminescent thermometers and probes.

Keywords:
Colorimetric luminescent probeLanthanide metal-origanic complexLuminescent thermometer

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Area of Science:

  • Materials Science
  • Coordination Chemistry
  • Luminescence

Background:

  • Lanthanide metal-organic frameworks (MOFs) are attractive for optical applications due to their unique luminescent properties.
  • Developing efficient luminescent thermometers requires materials with high sensitivity and stability over a wide temperature range.
  • C3 symmetric ligands like TCTZ offer versatile coordination possibilities for constructing MOFs.

Purpose of the Study:

  • To synthesize and characterize novel lanthanide-based MOFs using a TCTZ ligand.
  • To investigate the temperature-dependent photoluminescent (PL) properties of these MOFs.
  • To evaluate their potential as luminescent thermometers and colorimetric probes.

Main Methods:

  • Solvothermal synthesis of lanthanide-TCTZ complexes (Tb-TCTZ and Tb/Eu-TCTZ).
  • Temperature-dependent photoluminescence (PL) spectroscopy to measure emission intensity and lifetime.
  • Analysis of luminescence sensitivity (Sr and Sa) and emission color changes with temperature.

Main Results:

  • Successfully synthesized Tb-TCTZ and Tb/Eu-TCTZ complexes with intense luminescence.
  • Tb-TCTZ exhibited excellent temperature response from 303 to 403 K, with a maximum relative sensitivity (Sr) of 5.36% K⁻¹.
  • Tb0.99Eu0.01-TCTZ demonstrated high sensitivity (Sa = 5.16%, Sr = 3.22% K⁻¹) and a visible color change from green to red with increasing temperature.

Conclusions:

  • The synthesized lanthanide-TCTZ MOFs show significant potential as highly sensitive luminescent thermometers.
  • The ratiometric sensing capability and colorimetric response of Tb/Eu-TCTZ enhance its utility as a dual-mode temperature probe.
  • These materials offer superior performance compared to many previously reported luminescent thermometry materials.