Electroluminescent characteristics of one-dimensional silicon chains in dialkyl polysilanes

Satoshi Hoshino, Hiroyuki Suzuki, Michiya Fujiki, Masao Morita, Nobuo Matsumoto

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

We investigate the electroluminescent characteristics of polysilane-based single-layer light-emitting diodes (LEDs) which employ poly (din-hexylsilane) (PDHS) or poly(di-n-butylsilane) (PDBS) (PDHS-LED and PDBS-LED, respectively), the PDHS-LED exhibits an electroluminescence (EL) identical to its photoluminescence (PL), which is composed of an emission only in the near-ultraviolet (NUV) region. By contrast, the PDBS-LED exhibits EL in both the visible and NUV regions. Although these two polysilanes differ only in terms of their substituent groups, their device characteristics vary considerably; the PDBS-LED exhibits a larger device current, inferior rectifying behavior, and a lower turn-on voltage than the PDHS-LED. This observation is inconsistent with predictions based on the hypothetical band diagrams of these two LEDs. We have demonstrated the fundamental EL characteristics of σ-conjugated one-dimensional Si chains by using PDHS, which has a highly ordered backbone conformation and negligible structural defects.

Original languageEnglish
Pages (from-to)221-225
Number of pages5
JournalSynthetic Metals
Volume89
Issue number3
DOIs
Publication statusPublished - 1997 Sep
Externally publishedYes

Keywords

  • Dialkyl polysilanes
  • Electroluminescence
  • Silicon

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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