| 摘要 |
PURPOSE:To secure such a practical fluorescent lamp as enjoying an evaluation number of satisfiable color rendering properties and high lamp efficiency, by adding a fluorescent component, having luminosity somewhere about 490nm, to a three-wavelength range luminous type fluorescent lamp. CONSTITUTION:A phosphor mixture, having a first material, which has a maximum luminous wavelength somewhere about 490nm and being expressed with 4(Sr1-x,Eux)O.yAl2O3 (on condition that 0.005<=x<=0.2, 6<=y<=8), a phosphor, which shows luminescence of divalent europium having its maximum luminous wavelength in a range of 440-460nm, a phosphor, which shows the luminescence of trivalent terbium having its maximum luminous wavelength in a range of 520-560nm and a phosphor, which shows the luminescence of trivalent europium having its maximum luminous wavelength in a range of 600-620nm, is applied to a tube inner wall. With this constitution, color rendering properties and lamp efficiency are well improvable. |
