| 摘要 |
PURPOSE:To obtain a lamp having the intermediate feature between that of a lamp with high Ra and low efficiency and a lamp with low Ra and high efficiency, excellent in special color rendering properties, easy to adjust the color temperature, and rarely generating color phase shifting by combining specific 3-4 kinds of phosphors. CONSTITUTION:A compound is used, which is constituted with the first phosphor made of alkaline earth metal halophosphate activated by divalent europium expressed by a general formula M5-xX(PO4)3:Eu<2+>(x), the second phosphor with a peak wavelength range of 620-640nm and a half value width of 120-160nm, and the third phosphor consisting of calcium halophosphate activated by Sb and Mn, where M is an element mixture of Ba of 3.0-4.5 gram-atom, Ca of 0.5-2.0 gram-atom, and Mg of 0.01-1.0 gram-atom, (X) is a unit of F, Cl, Br or a mixture of two or more kinds, and (x) is a figure within a range of 1<x<=0.2. Thereby, a lamp having high color rendering properties and high efficiency, excellent in special color rendering properties, easy to adjust the color temperature, and rarely generating color phase shifting can be obtained. |
