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The surface structure of the incandescent body effects on the emissivity of the infra-red light. If an adequate surface structure can suppress the infra-red emission, the efficacy of the inoandescent lamp could increase. The main purpose of the present work is to measure the change of the infrared emission due to the surrace structure.Tungsten films with submicron-sized deep holes ( the diameter of 2-4 hundreds nanometer and the depth of 2-4 micrometers) were prepared and heating them. The spectra of incandescent light were measured at high temperature up to 1400K. We found that the amount of the infra-red emitted from the surface with submicron holes is almost a half of that from a surface with macroscopic holes. l.

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Fig. 1 Present phosphor model (efficacy＜0.5) and concept of visible two photon emission phosphor (efficacy≧0.5).

(1) J. deGroot, J. vanVliet" THE HIGH-PRESSURE SODIUM LAMP" (2) H. A. Ris"' Natrium-Xenon-Lampe mit umschaltbarer Farbtemperatur" LIGHT 2/1994Mercury-free HPS lamp with high CRI operated with choke type ballast