Photonic materials utilizing naturally occurring nanostructures

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

doi:10.1016/j.jphotochem.2004.04.033

Photonic materials utilizing naturally occurring nanostructures

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

Research output: Contribution to journal › Article › peer-review

9 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 language	English
Pages (from-to)	141-147
Number of pages	7
Journal	Journal of Photochemistry and Photobiology A: Chemistry
Volume	166
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jphotochem.2004.04.033
Publication status	Published - Aug 12 2004
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

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10.1016/j.jphotochem.2004.04.033

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title = "Photonic materials utilizing naturally occurring nanostructures",

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.",

author = "Hayato Kamioka and Hidenori Hiramatsu and Katsuro Hayashi and Masahiro Hirano and Hideo Hosono",

year = "2004",

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doi = "10.1016/j.jphotochem.2004.04.033",

language = "English",

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pages = "141--147",

journal = "Journal of Photochemistry and Photobiology A: Chemistry",

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T1 - Photonic materials utilizing naturally occurring nanostructures

AU - Kamioka, Hayato

AU - Hiramatsu, Hidenori

AU - Hayashi, Katsuro

AU - Hirano, Masahiro

AU - Hosono, Hideo

PY - 2004/8/12

Y1 - 2004/8/12

N2 - 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.

AB - 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.

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Photonic materials utilizing naturally occurring nanostructures

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