Synthesis, optical and electrochemical properties of luminescent polymers containing 1,2-diphenylmaleimide and thiophene segments

Ting Zhong Liu, Yun Chen

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In an attempt to balance energy barriers of hole and electron injection we prepared and characterized homopolymer containing electron-transporting 1,2-diphenylmaleimide chromophores (P1) and copolymers consisting of 1,2-diphenylmaleimide and hole-transporting 2,5-thiophene moieties (P2, P3) via dehalogenation polycondensation. The copolymers are amorphous materials with decomposition temperature greater than 450 °C. Absorption and fluorescence spectra were employed to investigate their optical properties both in solution and film state. Photoluminescence maxima of P1, P2 and P3 films are 564, 559 and 558 nm, respectively. The HOMO and LUMO energy levels have been estimated from their cyclic voltammograms. The HOMO levels of P1, P2, and P3 were readily raised with increasing thiophene content (-5.99, -5.59, and -5.43 eV, respectively), whereas their LUMO levels were very similar (-3.61 to -3.65 eV). Double-layer light-emitting diodes (Al/PEDOT:PSS/P1-P3/ITO) were fabricated to evaluate their optoelectronic characteristics. Incorporation of thiophene units successfully reduced the turn-on electric field from 11.0×105 to 2.9×105 V/cm, but it decreased the luminescent efficiency and the maximum brightness.

Original languageEnglish
Pages (from-to)10383-10391
Number of pages9
Journalpolymer
Volume46
Issue number23
DOIs
Publication statusPublished - 2005 Nov 14

Fingerprint

Thiophenes
Thiophene
Electrochemical properties
Polymers
Optical properties
Copolymers
Dehalogenation
Electron injection
Energy barriers
Chromophores
Polycondensation
Homopolymerization
Optoelectronic devices
Electron energy levels
Light emitting diodes
Luminance
Photoluminescence
Fluorescence
Electric fields
Decomposition

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

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title = "Synthesis, optical and electrochemical properties of luminescent polymers containing 1,2-diphenylmaleimide and thiophene segments",
abstract = "In an attempt to balance energy barriers of hole and electron injection we prepared and characterized homopolymer containing electron-transporting 1,2-diphenylmaleimide chromophores (P1) and copolymers consisting of 1,2-diphenylmaleimide and hole-transporting 2,5-thiophene moieties (P2, P3) via dehalogenation polycondensation. The copolymers are amorphous materials with decomposition temperature greater than 450 °C. Absorption and fluorescence spectra were employed to investigate their optical properties both in solution and film state. Photoluminescence maxima of P1, P2 and P3 films are 564, 559 and 558 nm, respectively. The HOMO and LUMO energy levels have been estimated from their cyclic voltammograms. The HOMO levels of P1, P2, and P3 were readily raised with increasing thiophene content (-5.99, -5.59, and -5.43 eV, respectively), whereas their LUMO levels were very similar (-3.61 to -3.65 eV). Double-layer light-emitting diodes (Al/PEDOT:PSS/P1-P3/ITO) were fabricated to evaluate their optoelectronic characteristics. Incorporation of thiophene units successfully reduced the turn-on electric field from 11.0×105 to 2.9×105 V/cm, but it decreased the luminescent efficiency and the maximum brightness.",
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Synthesis, optical and electrochemical properties of luminescent polymers containing 1,2-diphenylmaleimide and thiophene segments. / Liu, Ting Zhong; Chen, Yun.

In: polymer, Vol. 46, No. 23, 14.11.2005, p. 10383-10391.

Research output: Contribution to journalArticle

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