Photonic materials utilizing naturally occurring nanostructures

Hayato Kamioka, Hidenori Hiramatsu, Katsuro Hayashi, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We report distinct optical/electrical properties inherent to build-in nanostructures in transparent oxide based materials, oxychalcogenides LaCuOS and LaCuOSe having naturally formed multi-quantum well structures and 12CaO·7Al2 O3 (C12A7) with a unique nanoporous structure. LaCuOSe doped with Mg ions exhibit degenerative p-type conduction presumable due to "modulation doping mechanism" with a high mobility of 4.0 cm2 V-1 s-1 even at high hole concentration (∼2×1020 cm-3). The room temperature exciton, having a large binding energy (∼50 meV) due to the confinement effect of carriers in the CuS or CuSe layer, induces a large optical nonlinearity at room temperature (RT) (χ(3) = 2-4×10-9 esu) near the absorption band. The H- ion entrapped in nanosize cages in C12A7 lattice causes an persistent conversion at RT from an electric insulator (<10-10 S cm-1) to a semiconductor (0.3-100 S cm-1) by capturing electrons photo-ionized from H- ions in the cages. This is a first electronic conductor based on main group light metal oxides.

Original languageEnglish
Pages (from-to)141-147
Number of pages7
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume166
Issue number1-3
DOIs
Publication statusPublished - Aug 12 2004
Externally publishedYes

Fingerprint

Photonics
Nanostructures
photonics
Ions
Oxides
Electric insulators
Light Metals
room temperature
modulation doping
Light metals
Hole concentration
ions
Binding energy
Excitons
Temperature
Semiconductor quantum wells
metal oxides
Absorption spectra
Electric properties
conductors

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

Cite this

Photonic materials utilizing naturally occurring nanostructures. / Kamioka, Hayato; Hiramatsu, Hidenori; Hayashi, Katsuro; Hirano, Masahiro; Hosono, Hideo.

In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 166, No. 1-3, 12.08.2004, p. 141-147.

Research output: Contribution to journalArticle

Kamioka, Hayato ; Hiramatsu, Hidenori ; Hayashi, Katsuro ; Hirano, Masahiro ; Hosono, Hideo. / Photonic materials utilizing naturally occurring nanostructures. In: Journal of Photochemistry and Photobiology A: Chemistry. 2004 ; Vol. 166, No. 1-3. pp. 141-147.
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