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Aggregation-Induced Enhanced Emission-Active Zinc(II) β-Diketiminate Complexes Enabling High-Performance

Kirti Singh1, Iram Siddiqui2, Vidhyalakshmi Sridharan1

  • 1Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, SAS Nagar 140306, India.

Inorganic Chemistry
|December 6, 2021
PubMed
Summary
This summary is machine-generated.

Earth-abundant zinc complexes exhibit aggregation-induced emission for solid-state lighting. These novel organometallic molecules demonstrate promising electroluminescence in organic light-emitting diodes (OLEDs).

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Solid-State Physics

Background:

  • Organometallic molecules based on earth-abundant elements are sought for cost-effective solid-state lighting.
  • Zinc-based luminophores are gaining attention due to their potential for efficient light emission.

Purpose of the Study:

  • To synthesize and characterize novel, air-stable zinc complexes for use as emitters in organic light-emitting diodes (OLEDs).
  • To investigate the solid-state emission properties and aggregation-induced emission (AIE) behavior of these zinc complexes.

Main Methods:

  • Synthesis of two air-stable zinc complexes featuring sterically encumbered β-diketiminate ligands.
  • Structural analysis revealing a tetrahedral coordination geometry with propeller-like aryl ring orientation.
  • Fabrication and testing of multilayered OLED devices utilizing the synthesized zinc complexes as emitters.

Main Results:

  • The synthesized zinc complexes exhibit restricted rotation due to their molecular architecture, leading to aggregation-induced emission.
  • Both complexes demonstrate electroluminescence in the yellowish-green spectrum.
  • An OLED device using the Zn-I emitter achieved a maximum external quantum efficiency of 4.4%, with power and current efficacies of 15.2 lm W⁻¹ and 12.1 cd A⁻¹, respectively.

Conclusions:

  • The designed zinc complexes possess excellent solid-state emission properties due to their rigid structure and AIE characteristics.
  • These findings highlight the potential of zinc-based organometallic molecules as efficient emitters for practical OLED applications.
  • The reported performance is competitive among existing zinc-based OLEDs, paving the way for further development.