Study on High Luminous Efficacy and Long Lifetime Cluster Light Source.

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1. Experimental research1) We verified that WO_2 and MoO_3 and Re_2O_7 are suitable to make cluster, support material which is optimum for forming the tungsten cluster is NaBr, and NeAr mixed gas is suitable for the electric discharge gas and the filling pressure of 21.3 KPa is optimum.2) Using MoO_3 which does not require the support material in the cluster material, we examined how luminescence property of the cluster differs by type of the electric discharge gas. As a result, we obtained the knowledge that the luminous flux of NeAr, Kr, Ar and Xe was high in order.3) As a result of examining the metals suitable for formation of the cluster, it was 2 types of molybdenum and rhenium that these cluster emitted light without the halogen which assists the formation of the cluster.2. Theoretical researchComplex index of refraction of the cluster in operating temperatures of 4000 K - 5000 K is necessary in order to theoretically estimate luminescence property of the cluster light sources. In 2004 fiscal year, we measured the complex index of refraction of the bulk tungsten using the ellipsometry equipment which we have constructed. We calculated the complex index of refraction of the tungsten filaments of chandeliers lamps and halogen lamps which emitted light at the operating temperatures of 2000 K - 3000 K by the ellipsometry. The laser beam of the wavelength of 532nm which was second harmonic of the Nd : YAG laser of the wavelength of 1064nm in light source of the ellipsometry was used. As a result of comparing the complex index of refraction calculated by the ellipsometry with the value of the literature, the calculated complex index of refraction verified being a accuracy in which real part and imaginary part are high both.