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A Square-Net Europium(III) Metal-Organic Framework for Red-Emitting LEDs and Optical Temperature Sensing.

Lamia A Siddig1, Sheikh Jobe1, Abdalla S Abdelhamid1

  • 1Department of Chemistry, College of Science, United Arab Emirates University, Al Ain, P.O. Box 15551, United Arab Emirates.

Inorganic Chemistry
|April 11, 2026
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Summary
This summary is machine-generated.

A novel europium-based metal-organic framework, UAEU-71, shows bright red photoluminescence for LED applications. This bifunctional material also demonstrates reliable optical thermometry for precise temperature sensing.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) offer tunable properties for advanced applications.
  • Europium-based MOFs are of interest for their luminescent characteristics.

Purpose of the Study:

  • To synthesize and characterize a new europium-based MOF, UAEU-71.
  • To evaluate its potential as a red-emitting phosphor for LEDs.
  • To explore its application in optical thermometry.

Main Methods:

  • Solvothermal synthesis of UAEU-71 using Eu(III) ions and a dicarboxylate linker.
  • Single-crystal X-ray diffraction for structural determination.
  • Photoluminescence spectroscopy, PXRD, SEM/EDX, FTIR, TGA, XPS, DRS, and DFT calculations for characterization.
  • Temperature-dependent photoluminescence studies for thermometry.

Main Results:

  • UAEU-71 was successfully synthesized and characterized as a 2D sql framework.
  • It exhibits intense red photoluminescence (618 nm) with a PLQY of ~21%.
  • Demonstrated efficient red-emitting phosphor for LED applications.
  • Achieved reliable ratiometric optical thermometry with high sensitivity (-10 to 100 °C).

Conclusions:

  • UAEU-71 is a robust, semiconducting europium-based MOF.
  • It is a promising bifunctional material for solid-state lighting and optical temperature sensing.