JOURNAL ARTICLE

Perspective on doublet electroluminescence from organic radicals.

  • Published In: Applied Physics Letters, 2025, v. 126, n. 10. P. 1 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Yu, You-Jun; Li, Feng 3 of 3

Abstract

This article reviews recent advances in spin-doublet organic monoradicals and metal-based radicals, specifically Ce(III) and Eu(II) complexes, as emitters in organic light-emitting diodes (OLEDs). It highlights that these radicals exhibit spin-allowed doublet emission, enabling theoretically 100% internal quantum efficiency (IQE) under electrical excitation, with donor-functionalized carbon radicals achieving high external quantum efficiencies (EQEs) in deep-red and near-infrared regions, while Ce(III) and Eu(II) complexes show efficient blue to orange electroluminescence. The review discusses molecular design strategies, such as symmetry breaking and donor-functionalization, to enhance photoluminescence quantum yields (PLQYs) and stability, as well as host and sensitizer engineering to improve device performance and reduce efficiency roll-off. Challenges remain in expanding the color range to full RGB emission, improving radical stability, and deepening the understanding of doublet luminescence mechanisms to guide future material development.

Additional Information

  • Source:Applied Physics Letters. 2025/03, Vol. 126, Issue 10, p1
  • Document Type:Article
  • Subject Area:Physics
  • Publication Date:2025
  • ISSN:0003-6951
  • DOI:10.1063/5.0246006
  • Accession Number:183691069
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