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Method for the Detailed Characterization of Cosputtered Inorganic Luminescent Material Libraries.

Evert P J Merkx1, Erik van der Kolk1

  • 1Luminescence Materials , Delft University of Technology , Mekelweg 15 , 2629 JB Delft , The Netherlands.

ACS Combinatorial Science
|October 3, 2018
PubMed
Summary

A new device characterizes combinatorial luminescent thin-film libraries, revealing composition-dependent properties. Optimized phosphors, like NaI:Eu2+, show efficient luminescence, guiding material design.

Keywords:
combinatorial screeninginorganic phosphorsluminescencesputter deposition

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Luminescence Spectroscopy

Background:

  • Combinatorially developed luminescent materials require advanced characterization.
  • Existing methods lack the detail to correlate composition with luminescence.

Purpose of the Study:

  • To develop a device for direct characterization of luminescent thin-film libraries.
  • To establish a method for relating material composition to luminescent properties.

Main Methods:

  • Combinatorial gradient sputter deposition to create thin-film libraries.
  • Step-scan luminescence spectroscopy (excitation, emission, decay) and Energy Dispersive X-ray (EDX) measurements.
  • Application to a NaBr-NaI:Eu2+ gradient thin-film library.

Main Results:

  • Successfully resolved excitation, emission, and decay spectra across the gradient film.
  • Observed a fluent emission shift from 428 nm (NaBr:Eu2+) to 439 nm (gradient) and 441 nm (NaI:Eu2+).
  • Quantified concentration quenching effects and identified optimal luminescence near NaI:Eu2+.

Conclusions:

  • The developed device enables direct surveying of luminescent thin-film libraries.
  • The method allows for detailed study and optimization of luminescent behavior in various host-dopant systems.
  • Optimized phosphors for efficient luminescence are identified through compositional mapping.