Platinum(II) cyclometallates featuring broad emission bands and their applications in color-tunable OLEDs and high color-rendering WOLEDs

Guiping Tan, Shuming Chen, Chi Ho Siu, Adam Langlois, Yongfu Qiu, Hongbo Fan, Cheuk Lam Ho, Pierre D. Harvey, Yih Hsing Lo, Li Liu, Wai Yeung Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)

Abstract

Two phosphorescent platinum(ii) cyclometallated complexes with phenoxy groups (1 and 2) have been developed. The modified organic ligands derived by combining the phenoxy moiety and 2-phenylpyridine conferred them with a more flexible structure, leading to superior intermolecular interaction properties of the resulting Pt(ii) metallophosphors. Because of the excimer formation induced by Pt(ii) complexes 1 and 2, the emission color can be tuned over a wide range from cyan to orange by simply increasing the concentration of the Pt(ii) metallophosphors. Inspired by their broad emission band, color tunability and outstanding electroluminescence (EL) performance, these two Pt(ii) phosphors complemented with blue fluorescent emitter 4,4′-bis(9-ethyl-3-carbazovinylene)-1,1′-biphenyl (BCzVBi) were employed in manufacturing high color-rendering white organic light-emitting devices (WOLEDs). In such simple two-emitter systems, 1-based WOLEDs exhibited reasonable EL performance with an external quantum efficiency (ηext) of 11.7%, luminance efficiency (ηL) of 29.1 cd A-1, power efficiency (ηp) of 16.9 lm W-1and color rendering index (CRI) of 77, whereas 2-based WOLEDs demonstrated an ηextof 10%, ηLof 21.7 cd A-1, ηpof 10.7 lm W-1and CRI of 88.
Original languageEnglish
Pages (from-to)6016-6026
Number of pages11
JournalJournal of Materials Chemistry C
Volume4
Issue number25
DOIs
Publication statusPublished - 1 Jan 2016
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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