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Efficient Red-Emitting Platinum Complex with Long Operational Stability.

Tyler Fleetham1, Guijie Li1, Jian Li1

  • 1Materials Science and Engineering, Arizona State University, Tempe, Arizona 85287, United States.

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|July 10, 2015
PubMed
Summary

A novel platinum(II) complex, PtN3N-ptb, enables stable and efficient red phosphorescent organic light-emitting diodes (OLEDs). This development offers long operational lifetimes and high external quantum efficiencies (EQEs) comparable to iridium complexes.

Keywords:
OLEDefficiencyoperational lifetimephosphorescenceplatinum complexred emitter

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photochemistry

Background:

  • Organic light-emitting diodes (OLEDs) are crucial for modern display and lighting technologies.
  • Developing stable and efficient phosphorescent emitters, particularly for the red spectrum, remains a key challenge.
  • Platinum(II) complexes offer potential as alternatives to iridium complexes for phosphorescent OLEDs.

Purpose of the Study:

  • To develop a tetradentate cyclometalated platinum(II) complex, PtN3N-ptb, as an emissive dopant for red phosphorescent OLEDs.
  • To evaluate the efficiency, stability, and operational lifetime of OLEDs utilizing PtN3N-ptb.
  • To investigate the impact of host and transport materials on device performance.

Main Methods:

  • Synthesis and characterization of the tetradentate cyclometalated Pt(II) complex, PtN3N-ptb.
  • Fabrication of red phosphorescent OLED devices using PtN3N-ptb as a dopant.
  • Electrochemical stability testing and performance evaluation (efficiency, turn-on voltage, operational lifetime) under various device architectures and material combinations.

Main Results:

  • PtN3N-ptb demonstrated excellent performance as a red phosphorescent dopant in OLEDs.
  • Devices achieved long operational lifetimes, with an estimated LT97 of over 600 hours at 1000 cd/m(2) luminance.
  • Maximum forward-viewing external quantum efficiencies (EQEs) reached up to 21.5%.

Conclusions:

  • Pt(II) complexes, exemplified by PtN3N-ptb, are viable and highly effective dopants for stable and efficient red phosphorescent OLEDs.
  • The performance of PtN3N-ptb is comparable or superior to state-of-the-art iridium(III) complexes.
  • Further research into Pt(II) complexes can advance OLED technology for next-generation displays and lighting.