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Luminescence intensity in lanthanide coordination polymers cannot be determined by quantum yield alone. Luminance measurements are essential for accurate quantification, especially for comparing different emission colors.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Solid-State Chemistry

Background:

  • Lanthanide-based coordination polymers are crucial for technological applications requiring luminescence.
  • Accurate measurement of luminescence intensity is vital for material selection and development.
  • Existing metrics like quantum yield can be misleading for solid-state luminescence intensity.

Purpose of the Study:

  • To evaluate the reliability of quantum yield for assessing luminescence intensity in solid-state lanthanide coordination polymers.
  • To establish luminance measurement as a mandatory quantitative method for luminescence intensity.
  • To introduce a home-made setup for reproducible luminance measurements.

Main Methods:

  • Comparison of luminescence intensity using quantum yield, calculated brightness, and direct luminance measurements.
  • Development and detailed description of a home-made setup for reproducible luminance measurements.
  • Measurement of luminance for lanthanide-based coordination polymers with benzene-poly-carboxylate ligands.

Main Results:

  • Quantum yield does not correlate with luminescence intensity in solid-state compounds; high quantum yield can indicate poor luminescence.
  • Calculated brightness is suitable for infrared luminescence but requires similar colorimetric coordinates for visible light comparison.
  • Luminance measurement is the most effective method for comparing luminescence intensities across different emission colors.

Conclusions:

  • Luminance measurement is indispensable for quantitative assessment of luminescence intensity in lanthanide coordination polymers.
  • A novel, reproducible setup for luminance measurement is presented.
  • The study suggests a standard for calibration in luminance measurements of these materials.