Rational color tuning and luminescent properties of functionalized boron-containing 2-pyridyl pyrrolide complexes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Hsing-Yi Chen
  • Chao-Shiuan Liu
  • Jen-Kan Yu
  • Yi-Ming Cheng
  • Kung-Shih Chen
  • Pi-Tai Chou
  • Shie-Ming Peng
  • Gene-Hsiang Lee
  • Arthur J. Carty
  • Shi-Jay Yeh
  • Chin-Ti Chen

Detail(s)

Original languageEnglish
Pages (from-to)567-574
Journal / PublicationAdvanced Functional Materials
Volume15
Issue number4
Online published23 Mar 2005
Publication statusPublished - Apr 2005
Externally publishedYes

Abstract

Three systematically functionalized pyrrolide ligands were prepared via the coupling of methyl vinyl ketone and the respective carbaldehyde reagents, followed by treatment of the pre-formed dicarbonyl compounds with (NH4)2CO3 in order to generate the required pyrrole fragment. These ligands readily reacted with the boron reagent BPh3 to afford the complexes [(pyro)BPh2] (2a), [(noro)BPh2] (2b), and [(xaro)BPh2] (2e), where (pyro)H, (noro)H, and (xaro)H represents the 2-pyridyl, 2-quinolinyl, and 2-quinoxalinyl pyrrole groups, respectively. Complexes 2a-2c give stable solutions in air, and show strong photoluminescence with emission peak maxima located at 490 nm, 510 nm, and 575 nm, respectively. Calculations based upon time-dependent density function theory (TDDFT) show that the S1 state in these complexes is attributed to an allowed (π-symmetry) → π* (π-symmetry) transition located at the chelating pyrrolide moieties. Electroluminescence (EL) devices based on 2c were fabricated. The EL emission from 2c as the host-emitter, with the emission peak maximum shifted to 580 nm, was observed when BCP was used as the hole blocking material. This device produces saturated red-orange light-emission at an onset voltage of 8 V and a maximum brightness of 5000 cd m-2 at a driving voltage of 15 V; the external quantum yield is estimated to be 0.5 %. 

Citation Format(s)

Rational color tuning and luminescent properties of functionalized boron-containing 2-pyridyl pyrrolide complexes. / Chen, Hsing-Yi; Chi, Yun; Liu, Chao-Shiuan; Yu, Jen-Kan; Cheng, Yi-Ming; Chen, Kung-Shih; Chou, Pi-Tai; Peng, Shie-Ming; Lee, Gene-Hsiang; Carty, Arthur J.; Yeh, Shi-Jay; Chen, Chin-Ti.

In: Advanced Functional Materials, Vol. 15, No. 4, 04.2005, p. 567-574.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review