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Alternating current driven organic light emitting diodes using lithium fluoride insulating layers.

Shang-Yi Liu1, Jung-Hung Chang1, I-Wen Wu1

  • 1Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 106, Taiwan.

Scientific Reports
|December 20, 2014
PubMed
Summary
This summary is machine-generated.

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We developed stable alternating current (AC) organic light-emitting diodes (OLEDs) using thermal evaporated lithium fluoride (LiF) insulating layers. These AC-OLEDs exhibit low turn-on voltage and reliable performance, verified by advanced spectroscopy.

Area of Science:

  • Organic electronics
  • Solid-state lighting
  • Materials science

Background:

  • Alternating current (AC) organic light-emitting diodes (OLEDs) require stable and high-capacitance insulating layers for efficient operation.
  • Thermal evaporation is a common technique for fabricating thin films in electronic devices.

Purpose of the Study:

  • To demonstrate AC-driven OLEDs utilizing lithium fluoride (LiF) insulating layers fabricated via thermal evaporation.
  • To investigate the electronic band structure, operating mechanism, and electrical characteristics of these AC-OLED devices.
  • To evaluate the stability and performance of LiF as an insulating layer in AC-driven OLEDs.

Main Methods:

  • Fabrication of AC-driven OLEDs with LiF insulating layers using thermal evaporation.
  • Simultaneous Ultraviolet Photoemission Spectroscopy (UPS) and Inverse Photoemission Spectroscopy (IPES) for electronic band structure analysis.

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  • Time-resolved luminance measurements to assess device performance under AC voltage.

    • Main Results:

    • The fabricated AC-OLEDs with LiF layers demonstrated high stability and excellent capacitance.
    • A low turn-on voltage of 7.1 V was achieved.
    • Maximum luminance of 87 cd/m(2) was obtained at 10 kHz and 15 Vrms.
    • UPS and IPES elucidated the electronic band structure and operating principles.
    • Time-resolved luminance confirmed reliable device performance.

    Conclusions:

    • Thermal evaporated LiF is a suitable material for high-stability insulating layers in AC-driven OLEDs.
    • The developed AC-OLEDs offer promising performance with low turn-on voltage and good luminance.
    • Simultaneous UPS and IPES are effective tools for understanding the optoelectronic properties of AC-OLEDs.