原子状付活剤を有する蛍光体の可能性研究

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Lighting products consume about 20% of total electric power, so the lighitng industry should take a large responsibikity for energy saving. Fluoescent lamps ae a paritcularly critical light source for energy saving because they are widely used. Although the fluorescent lamp has high efficiency, its energy - transition rate if still as low as 25%. There is thus much room for improvement. The key issue for efficiency improvement is the phosphor technology. Phosphors have been researched and improved based in the one - photon emission theory. Currently, the highest phosphor ejjiciency (transition rate of UV to visible) is over 40%. However, the energy of 254nm UV photon of Hg discharge is 4.9eV, which could be transferred to two visible photons. We investigated the feasibility of the two - photon approach. We specifically studied a phosphor with an activator of a metal atom in an atomic state, which produces atomic - like emissions from an isolated metal atom fixed in a matrix. First, we theoretically studied the selection of possible metal atoms and analized the probability of two - photon emission. First, we searched for a method for fixing and isolating atoms in a matrix at room temperature and analyzed the energy shift of an excited atoms. As a result, we could have a prospect of te feasibility. Next, we conducted an experiment to fabricate a new phosphor sample by fixing an atom in an atomic state in a matrix and evaluated the performance of the samples. We selected Fe atoms, an amorphous silica as a matrix, and sol - gel fabrication method. We found that Fe atoms on a silica matrix were fixed in an atomic state by sol - gel fabrication and emitted fluorescent light at lower atomic densities. However, the emission was not made by the visible two - photon transition, but by continuous deep - blue continuos emission.
社団法人照明学会の論文
2001-02-01

原子状付活剤を有する蛍光体の可能性研究

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