Narukawa Yukio | Nichia Chemical Industries Ltd., Anan, Tokusima 774-0044, Japan

Department Of Electrical Engineering Faculty Of Engineering Osaka University

Department of Physics and Astronomy, Arizona State University

Department of Physics and Astronomy, Arizona State University

Department of Physics and Astronomy, Arizona State University

H. H. Wills Physics Laboratory, University of Bristol

Nichia Corporation, 491 Oka, Kaminaka, Anan, Tokushima 774-8601, Japan

Nichia Chemical Industries Ltd., Anan, Tokusima 774-0044, Japan

Osaka Electro-Communication University, Neyagawa, Osaka 572-8530, Japan

Osaka Electro-Communication University, Neyagawa, Osaka 572-8530, Japan

Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan

H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, U.K.

Department of Physics and Astronomy, Arizona State University, Tempe, Arizona, U.S.A.

Nichia Corporation, 491 Oka, Kaminaka, Anan, Tokushima 774-8601, Japan

Department of Physics and Astronomy, Arizona State University, Tempe, Arizona, U.S.A.