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Solution processable MOF yellow phosphor with exceptionally high quantum efficiency.

Qihan Gong1, Zhichao Hu, Benjamin J Deibert

  • 1Department of Chemistry and Chemical Biology, Rutgers University , 610 Taylor Road, Piscataway, New Jersey 08854, United States.

Journal of the American Chemical Society
|November 12, 2014
PubMed
Summary

Researchers developed a rare-earth-free yellow phosphor for white light-emitting diodes (WLEDs). This new material achieves a record 90.7% internal quantum yield, offering a stable and tunable alternative for WLED applications.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Photonic Materials

Background:

  • Developing efficient and stable phosphors is crucial for advancing white light-emitting diodes (WLEDs).
  • There is a significant need for rare-earth (RE)-free phosphors to overcome cost and environmental concerns associated with RE elements.
  • Existing RE-free phosphors often lack the high efficiency and stability required for commercial WLED applications.

Purpose of the Study:

  • To design and synthesize a novel rare-earth-free, blue-excitable yellow phosphor.
  • To achieve high internal quantum yield (IQY) and excellent stability for phosphor-converted WLEDs.
  • To explore the potential of metal-organic frameworks (MOFs) incorporating molecular fluorophores for WLED applications.

Main Methods:

  • Synthesis of a new three-dimensional metal-organic framework, [Zn6(btc)4(tppe)2(DMA)2], using benzene-1,3,5-tricarboxylate (btc), 1,1,2,2-tetrakis(4-(pyridin-4-yl)phenyl)ethene (tppe), and dimethylacetamide (DMA).
  • Characterization of the MOF's crystal structure and photoluminescent properties, including excitation and emission spectra.
  • Measurement of internal quantum yield (IQY) and external quantum yield (EQY) under blue light excitation (λex = 400 nm).
  • Assessment of luminescent and moisture stability, solution processability, and color tunability.

Main Results:

  • A new RE-free yellow phosphor based on a MOF structure was successfully synthesized.
  • The phosphor exhibits bright yellow emission when excited by blue light.
  • Achieved the highest reported internal quantum yield (IQY) of 90.7% for RE-free, blue-excitable yellow phosphors.
  • Demonstrated high external quantum yield (EQY), excellent luminescent and moisture stability, and good solution processability.

Conclusions:

  • The novel MOF-based yellow phosphor represents a significant advancement in RE-free luminescent materials.
  • Its exceptional IQY, stability, and processability make it a highly promising candidate for phosphor-converted WLEDs.
  • This work highlights the potential of MOFs incorporating molecular fluorophores for next-generation lighting technologies.