Alkyl-Spacer Enhancement in Performance of Light-Emitting Electrochemical Cells

Ler Chun Shiu, Bo Ren Chang, Miles C.S. Hsiao, Wu Sian Sie, Ming Lun Wu, Li Xian Huang, Cheng Ming Wang, Gene Hsiang Lee, I. Jy Chang, Hai Ching Su, Kom Bei Shiu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Synthetic, structural, photophysical, and electrochemical study of [Ir(ppy)2(py)2](BF4) (1(BF4)) and four di-N–N-bridged complexes of [Ir(ppy)2(bpa)]2(BF4)2 (2A(BF4)2), [Ir(ppy)2((cis-bpe))]2(BF4)2 (2B(BF4)2), [Ir(ppy)2(tmp)]2(BF4)2 (2C(BF4)2), and [Ir(ppy)2(bpy)]4(BF4)4 (3(BF4)4) are described with Hppy = 2-phenylpyridine, py = pyridine, N–N = dipyridyl ligands of 1,2-bis(4-pyridyl)ethane (bpa), cis-1,2-bis(4-pyridyl)ethylene (cis-bpe), 1,3-di(4-pyridyl)propane (tmp), and 4,4'-dipyridine (bpy). Five single-crystal structures of 1(PF6), 2A(NO3)2, 2A(PF6)2, 2B(PF6)2, and 3(NO3)4 were determined, supporting the dibridged structures and presence of a variety of stereoisomers. Application of four luminescent complexes, 1(BF4), 2A(BF4)2, 2C(BF4)2, and 3(BF4)4, in solid-state light-emitting electrochemical cells (LECs) is reported. The work demonstrates an effective approach to realize efficient LECs based on dibridged di- and multinuclear cationic transition-metal complexes with a suitably long alkyl spacer in the bridging ligand.

Original languageEnglish
Pages (from-to)3517-3526
Number of pages10
JournalEuropean Journal of Inorganic Chemistry
Issue number36
Publication statusPublished - 2020 Sept 30


  • Iridium
  • Ligand effects
  • Luminescence
  • Molecular devices
  • Synthesis design

ASJC Scopus subject areas

  • Inorganic Chemistry


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