Akira Komeno

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IEICE Transactions on Electronics | 2006

Kenji Toda; Yoshitaka Kawakami; Shinichiro Kousaka; Yutaka Ito; Akira Komeno; Kazuyoshi Uematsu; Mineo Sato

We focus on the development of new silicate phosphors for a white LED. In the europium doped silicate system, four LED phosphor candidates-Li 2 SrSiO 4 :Eu 2+ , Ba 9 Sc 2 Si 6 O 24 :Eu 2+ , Ca 3 Si 2 O 7 :Eu 2+ and Ba 2 MgSi 2 O 7 :Eu 2+ were found. Luminescent properties under near UV and visible excitation were investigated for the new Eu 2+ doped LED silicate phosphors. These new phosphors have a relatively strong absorption band in a long wavelength region.

Key Engineering Materials | 2004

Akira Komeno; Yoshio Aoyama; Kenji Toda; Mineo Sato; Kazuyoshi Uematsu

A-site deficient perovskite, Y0.22(Ta0.66W0.34)O3 with was determined by the Rietveld refinement method from neutron diffraction data. Y0.22Ta0.66W0.34O3 is an A-site ordered monoclinic symmetry. The space group of Y0.22Ta0.66W0.34O3 is C2/c (No.15) and lattice parameters of a = 0.764(1) nm, b = 0.764(1) nm, c = 0.763(1) nm and β = 90.36 ̊.

Journal of Alloys and Compounds | 2006

Yutaka Ito; Akira Komeno; Kazuyoshi Uematsu; Kenji Toda; Mineo Sato

Journal of Alloys and Compounds | 2006

Akira Komeno; Kazuyoshi Uematsu; Kenji Toda; Mineo Sato

Journal of Alloys and Compounds | 2006

Y. Komatsu; Akira Komeno; Kenji Toda; Kazuyoshi Uematsu; Mineo Sato

希土類 = Rare earths | 2007

Yoshitaka Kawakami; Akira Komeno; Kazuyoshi Uematsu; Kenji Toda; Mineo Sato

Preprints of Annual Meeting of The Ceramic Society of Japan Preprints of Fall Meeting of The Ceramic Society of Japan Annual Meeting of The Ceramic Society of Japan, 2006 | 2006