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All-Copper Nanocluster Based Down-Conversion White Light-Emitting Devices.

Zhenguang Wang1, Bingkun Chen2, Andrei S Susha1

  • 1Department of Physics and Materials Science and Centre for Functional Photonics (CFP) City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong SAR.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 17, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces cost-effective white light-emitting devices (WLEDs) using copper nanoclusters (Cu NCs) as an alternative to rare-earth elements. These novel Cu NCs offer efficient orange and blue light emission for improved WLED performance.

Keywords:
aggregation‐induced emission enhancementcopper nanoclustersdown‐conversion light‐emitting devicesphotoluminescencewhite light

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Current white light-emitting devices (WLEDs) predominantly use rare-earth elements, which are costly and have limited supply.
  • Developing sustainable and affordable alternatives for WLEDs is crucial for technological advancement.

Purpose of the Study:

  • To develop novel, low-cost white light-emitting devices (WLEDs) using copper nanoclusters (Cu NCs).
  • To synthesize and characterize orange and blue emitting Cu NCs for down-conversion WLED applications.
  • To evaluate the performance of all-copper nanocluster-based WLEDs.

Main Methods:

  • Synthesized orange-emitting Cu NCs using glutathione, followed by solvent-induced aggregation.
  • Synthesized blue-emitting Cu NCs via reduction of Cu(II) ions with ascorbic acid and surface treatment with sodium citrate.
  • Fabricated WLEDs by integrating synthesized Cu NCs onto a commercial GaN LED chip.

Main Results:

  • Achieved photoluminescence quantum yields (PL QY) of 24% (solution) and 43% (solid-state) for orange Cu NCs.
  • Obtained a PL QY of 14% (solution and solid-state) for blue Cu NCs.
  • Fabricated WLEDs exhibited excellent white light characteristics: CIE coordinates (0.36, 0.31), CRI of 92, and CCT of 4163 K.

Conclusions:

  • Copper nanoclusters offer a viable, cost-effective alternative to rare-earth elements in WLEDs.
  • The developed synthesis methods yield Cu NCs with high emission efficiency and stability.
  • All-copper nanocluster-based WLEDs demonstrate promising performance for practical applications.