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Efficient electroluminescence from new lanthanide (Eu3+, Sm3+) complexes.

Jiangbo Yu1, Liang Zhou, Hongjie Zhang

  • 1Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, and Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, People's Republic of China.

Inorganic Chemistry
|March 1, 2005
PubMed
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Two new lanthanide complexes, europium (Eu3+) and samarium (Sm3+), show bright luminescence. Devices using these emitters achieve top performance, with one Eu3+ device reaching 957 cd/m2 brightness.

Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Photophysics

Background:

  • Lanthanide complexes are promising for electroluminescent devices.
  • Developing efficient emitters is crucial for display technologies.
  • Existing lanthanide emitters face challenges in brightness and efficiency.

Purpose of the Study:

  • Synthesize and characterize novel lanthanide complexes for electroluminescence.
  • Evaluate the performance of these complexes as emitters in organic light-emitting diodes (OLEDs).
  • Investigate the impact of ligand structure on device efficiency.

Main Methods:

  • Synthesis of two new lanthanide complexes: Eu(HFNH)3phen and Sm(HFNH)3phen.
  • Structural characterization of the complexes.

Related Experiment Videos

  • Fabrication and testing of OLED devices incorporating these complexes as emitters.
  • Comparison of device performance with existing lanthanide emitters.

    • Main Results:

    • Both Eu3+ and Sm3+ complexes exhibit bright room-temperature photoluminescence.
    • The Eu3+ complex-based device achieved a maximum brightness of 957 cd/m2 and a current efficiency of 4.14 cd/A.
    • The Sm3+ complex-based device reached a maximum brightness of 42 cd/m2 and a current efficiency of 0.18 cd/A.
    • Device efficiency was significantly improved by ligand polyfluorination and the incorporation of a naphthyl group.

    Conclusions:

    • The synthesized lanthanide complexes are highly efficient emitters for OLEDs.
    • Ligand design, specifically polyfluorination and extended conjugation, is key to enhancing device performance.
    • These findings pave the way for advanced red and red-orange emitting OLEDs.