Technical Journal

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  Recently, the research and development of solid-state lighting devices using phosphors pumped by violet LED has attracted much attention because of low environmental load, high reliability and high luminous efficiency. In this paper, we describe a samarium-doped phosphor showing the intense emission in red-region due to pumping in a 400nm band, where InGaN-based optical devices have presumably highest efficiency. A trivalent samarium ion has an intense excitation band at around 400nm, which is most suitably pumped using the InGaN-based optical devices. The internal quantum efficiency of 40% was confirmed in a borate-glass host. The optimization of emission intensity, absorption efficiency and branching ratio by controlling the samarium content as well as the host material and its composition are discussed.

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