Related Experiment Video
Updated: Oct 5, 2025
High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
Published on: April 16, 2017
High-Performance Luminescence Thermometer with Field-Induced Slow Magnetic Relaxation Based on a Heterometallic
Vassilis Tangoulis1, Vassilis Nastopoulos1, Nikos Panagiotou2
1Department of Chemistry, University of Patras, 26504 Patras, Greece.
New dysprosium (Dy) and cobalt (Co) or iron (Fe) complexes exhibit slow magnetic relaxation and function as high-performance luminescence thermometers. Compound 1 shows excellent thermal sensitivity and color-changing properties with temperature.
Area of Science:
- Coordination Chemistry
- Materials Science
- Magnetochemistry
- Luminescence Thermometry
Background:
- Development of novel coordination complexes for advanced applications.
- Need for sensitive and reliable luminescence thermometers.
- Exploration of magnetic properties in lanthanide-containing compounds.
Purpose of the Study:
- Synthesize and characterize novel Dy-Co and Dy-Fe cyanide-based complexes.
- Investigate the magnetic relaxation dynamics of the synthesized compounds.
- Evaluate the potential of these complexes as high-performance luminescence thermometers.
Main Methods:
- Single-crystal X-ray crystallography for structural determination.
- Elemental analyses and Infrared (IR) spectroscopy for characterization.
- Direct current (dc) and alternating current (ac) magnetic susceptibility measurements.
- SQUID magnetometry and CASSCF calculations for magnetic dynamics.
- High-resolution optical spectroscopy for luminescence thermometry.
Main Results:
- Successful synthesis of [DyCo(CN)6(bpyO2)2(H2O)3]·4H2O (1) and [DyFe(CN)6(bpyO2)2(H2O)3]·4H2O (2) in high yields.
- Observation of slow magnetic relaxation in both compounds under a dc field.
- Compound 1 exhibits a maximum thermal sensitivity of 1.84% K-1 between 40-140 K, exceeding the high-performance threshold.
- Compound 1 displays a visible color shift from warm white to natural white with increasing temperature.
Conclusions:
- The synthesized Dy-Co and Dy-Fe complexes possess interesting magnetic relaxation properties.
- Compound 1 demonstrates significant potential as a highly sensitive luminescence thermometer.
- The temperature-dependent chromaticity of compound 1 suggests applications in temperature sensing and display technologies.
More Related Videos
06:06A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements
Published on: July 19, 2016
07:24Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
Related Concept Videos
03:02Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
01:14Photoluminescence: Applications
01:26Variables Affecting Phosphorescence and Fluorescence