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Related Experiment Video

Updated: Jul 5, 2025

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
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High Mobility Emissive Excimer Organic Semiconductor Towards Color-Tunable Light-Emitting Transistors.

Ziyi Xie1,2, Dan Liu1, Zhennan Zhao3

  • 1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

Angewandte Chemie (International Ed. in English)
|January 21, 2024
PubMed
Summary

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Angewandte Chemie (International ed. in English)·2026
This summary is machine-generated.

Researchers designed a novel organic semiconductor, 2,7-di(2-anthryl)-9H-fluorene (2,7-DAF), enabling high-performance organic light-emitting transistors (OLETs). This material achieves color-tunable emission, advancing smart displays and optical communications.

Area of Science:

  • Materials Science
  • Organic Electronics
  • Optoelectronics

Background:

  • Organic light-emitting transistors (OLETs) are crucial for smart displays and optical communications.
  • Achieving color-tunable emission in OLETs is challenging due to the difficulty in designing organic semiconductors with high carrier mobility, strong solid-state emission, and tunable color properties.

Purpose of the Study:

  • To design and synthesize a novel high-mobility emissive excimer organic semiconductor for OLETs.
  • To demonstrate voltage-dependent, electrically induced color-tunable emission in OLETs.

Main Methods:

  • Rational design of 2,7-di(2-anthryl)-9H-fluorene (2,7-DAF) by introducing a rotatable carbon-carbon single bond.
  • Characterization of 2,7-DAF single crystals to analyze their arrangement and packing modes.
Keywords:
Color-tunableHigh mobilityOrganic light-emitting transistorsOrganic semiconductorStrong excimer emission

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  • Fabrication and testing of OLETs based on 2,7-DAF single crystals to evaluate optoelectronic properties and emission characteristics.

    • Main Results:

    • 2,7-DAF exhibits high carrier mobility (2.16 cm² V⁻¹ s⁻¹) and strong excimer emission (PLQY of 47.4%).
    • The unique dimer arrangement and herringbone packing of 2,7-DAF single crystals contribute to superior optoelectronic properties.
    • First demonstration of voltage-dependent, electrically induced color-tunable emission from orange to blue in an individual 2,7-DAF single crystal-based OLET.

    Conclusions:

    • 2,7-DAF represents a new class of high-mobility emissive excimer organic semiconductors.
    • This study provides a promising platform for developing color-tunable OLETs for advanced optoelectronic applications.