2006 Fiscal Year Final Research Report Summary
Synthesis of bright deep ultraviolet hexagonal boron nitride single crystals and their optical properties
| Project/Area Number |
16350105
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials/Devices
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
TANIGUCHI Takashi National Institute for Materials Science, Advanced Nanomaterials Laboratory, High Pressure Group, Leader, ナノ物質ラボ, グループリーダー (80354413)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Kenji National Institute for Materials Science, Optronic Materials Center, Senior Researcher, 光材料センター, 主任研究員 (20343840)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Deep ultraviolet light emission / Wide-band gap semiconductor / Hexagonal boron nitride / Impurity control / Flux single crystal growth |
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| Research Abstract |
To obtain a semiconductor light-emitting element with short wavelength below 300nm is a very important technical challenge for the area of information storage and environmental preservation process.
In this study, single crystalline hBN was obtained by using reactive solvent of Ba-BN system under high pressure. The crystals have a high degree of transparency and were shown to have very interesting optical characteristics. The high-purity single crystalline hBN obtained has a clear hexagonal shape, is colorless and is highly transparent. Evaluation of the optical characteristics of the crystal revealed high intensity ultraviolet emission (cathode luminescence : CL). From the observed optical characteristics, hBN is a semiconductor of the direct transition type with a band-gap of 5.9eV. It has thus been proven that hBN has excellent quality as a candidate for a new deep ultraviolet light emission element.
Since hBN has a layer structure, by unfolding, it is possible to obtain a crystal of parallel and flat shape. As the high-purity hBN parallel/flat crystal was excited with radiation of an electron beam, we found that light emission with 215nm wavelength causes several phenomena characteristic of laser operation, and confirmed the generation of a laser beam at room temperature. It has been proven that in principle, hBN has high potential for ultraviolet emission device materials since it is highly stable chemically and thermally as a wide-band semiconductor of the direct transition type.
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[Journal Article] Electric structure of boron nitride single crystals and films2005
Author(s)
J.B.MacNaughton, A.Moewes, R.G.Wilks, X.T.Zhou, T.K.Sham, T.Taniguchi, K.Watanabe, C.Y.Chan, W.J.Zhang, I.Bello, S.T.Lee, H.Hofsass
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Journal Title
Phys. Rev.B 72
Pages: 195113
Description
「研究成果報告書概要(欧文)」より
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