Layered mixed-anion compounds: Epitaxial growth, active function exploration, and device application

Hidenori Hiramatsu, Yoichi Kamihara, Hiroshi Yanagi, Kazushige Ueda, Toshio Kamiya, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Optoelectronic properties and device applications of layered mixed-anion compounds such as oxychalcogenide LaCuOCh (Ch = chalcogen) and oxypnictide LaTMOPn (TM = 3d transition metal, Pn = pnicogen) are reviewed. Several distinctive functions have been found in these materials based on our original material exploration concept. Fabrication of high-quality epitaxial films of LaCuOCh leads to clarifying the excellent electrical and optical properties such as high hole mobility of 8 cm2/(V s) and heavy hole doping at >1021 cm-3 in LaCuOSe, and sharp and tunable-wavelength photoluminescence in the solid-solution systems in LaCuOCh. In addition, a room temperature operation of a light-emitting diode is demonstrated using LaCuOSe as a light-emitting layer. These results suggest that the layered oxychalcogenides have potential for light-emitting layers as well as transparent hole-injection layers in organic/inorganic light-emitting diodes. Furthermore, by extending the material system from the copper-based oxychalcogenides to isostructural compounds, transition metal-based oxypnictides LaTMOP (TM = Fe, Ni), we have found novel superconductors, LaFeOP and LaNiOP.

Original languageEnglish
Pages (from-to)245-253
Number of pages9
JournalJournal of the European Ceramic Society
Issue number2
Publication statusPublished - 2009 Jan
Externally publishedYes


  • Electrical properties
  • Epitaxial thin films
  • Optical properties
  • Solid state reaction
  • Superconductivity

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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