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Related Experiment Video

Updated: Jul 16, 2026

A Step Beyond BRET: Fluorescence by Unbound Excitation from Luminescence (FUEL)
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Pi-conjugated aromatic enynes as a single-emitting component for white electroluminescence.

Yu Liu1, Masayoshi Nishiura, Yue Wang

  • 1Organometallic Chemistry Laboratory, RIKEN (The Institute of Physical and Chemical Research), Hirosawa 2-1, Wako, Saitama 351-0198, Japan.

Journal of the American Chemical Society
|April 28, 2006
PubMed
Summary

New organolanthanide catalysts efficiently synthesized carbazole-substituted phenyl enynes. The (E)-isomer (E)-CPEY serves as a single-emitting component for highly pure white organic light-emitting devices (WOLEDs).

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Area of Science:

  • Organometallic Chemistry
  • Materials Science
  • Organic Electronics

Background:

  • Development of efficient single-emitting components for white organic light-emitting devices (WOLEDs) is crucial for advanced display technologies.
  • Carbazole-substituted phenyl enynes are promising candidates due to their tunable electronic and optical properties.

Purpose of the Study:

  • To synthesize novel carbazole-substituted phenyl enynes using organolanthanide catalysts.
  • To evaluate the potential of these compounds, particularly (E)-CPEY, as single-emitting components in WOLEDs.

Main Methods:

  • Synthesis of (Z)-CPEY and (E)-CPEY using organolanthanide catalysts Me2Si(C5Me4)(NAr)Lu(CH2SiMe3)(THF) and (C5Me5)2LaCH(SiMe3)2, respectively.
  • Catalytic dimerization of terminal alkynes with high regio- and stereoselectivity.

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  • Fabrication and characterization of double-layer WOLED devices utilizing (E)-CPEY as the single-emitting component.

    • Main Results:

    • Excellent regio- and stereoselectivity achieved in the synthesis of (Z)-CPEY and (E)-CPEY.
    • (E)-CPEY demonstrated efficient white light emission by combining blue emission from isolated molecules and green/orange-red emission from excimers.
    • The (E)-CPEY-based WOLED achieved near-pure white light (CIE coordinates (0.32, 0.33)), high brightness (1395 cd m-2), and good current efficiency (2.07 cd A-1).
    • Remarkable stability of white emission quality across varying driving voltages.

    Conclusions:

    • Organolanthanide catalysts provide an effective route to synthesize carbazole-substituted phenyl enynes with high selectivity.
    • (E)-CPEY is a highly promising single-emitting component for achieving pure white light in WOLEDs.
    • The developed WOLED technology shows significant potential for practical applications due to its performance and stability.