Luminescent platinum(II) complexes of 1,3-bis(N-alkylbenzimidazol- 2′-yl)benzene-type ligands with potential applications in efficient organic light-emitting diodes

Elizabeth Suk Hang Lam, Daniel Ping Kuen Tsang, Wai Han Lam, Anthony Yiu Yan Tam, Mei Yee Chan, Wing Tak Wong, Vivian Wing Wah Yam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

67 Citations (Scopus)

Abstract

A series of luminescent platinum(II) complexes of tridentate 1,3-bis(N-alkylbenzimidazol-2′-yl)benzene (bzimb) ligands has been synthesized and characterized. One of these platinum(II) complexes has been structurally characterized by X-ray crystallography. Their electrochemical, electronic absorption, and luminescence properties have been investigated. Computational studies have been performed on this class of complexes to elucidate the origin of their photophysical properties. Some of these complexes have been utilized in the fabrication of organic light-emitting diodes (OLEDs) by using either vapor deposition or spin-coating techniques. Chloroplatinum(II)-bzimb complexes that are functionalized at the 5-position of the aryl ring, [Pt(R-bzimb)Cl], not only show tunable emission color but also exhibit high current and external quantum efficiencies in OLEDs. Concentration-dependent dual-emissive behavior was observed in multilayer OLEDs upon the incorporation of pyrenyl ligand into the Pt(bzimb) system. Devices doped with low concentrations of the complexes gave rise to white-light emission, thereby representing a unique class of small-molecule, platinum(II)-based white OLEDs.
Original languageEnglish
Pages (from-to)6385-6397
Number of pages13
JournalChemistry - A European Journal
Volume19
Issue number20
DOIs
Publication statusPublished - 10 May 2013
Externally publishedYes

Keywords

  • cyclometalation
  • density functional calculations
  • luminescence
  • organic light-emitting diodes
  • platinum

ASJC Scopus subject areas

  • Chemistry(all)

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