| 摘要 |
PURPOSE:A fluorescent lamp of high color rendering type wherein a color rendering property division is three wavelength zone emission type and a light source color belongs to color of electric bulb, obtained by coating the inner face of glass tube with a mixture of specific four fluorescent substances. CONSTITUTION:A mixture consisting of (A) 0.5-9wt% first fluorescent substance which is activated with bivalent Eu and has emission peak at 440-455 nm range, (B) a second fluorescent substance which is activated with trivalent Tb and colors in yellowish green, (C) a third fluorescent substance shown by the formula Ln2O3:Eu(Ln is Y, La or Gd) and (D) about 10-50wt% fourth fluorescent substance which is activated with trivalent Eu and has emission peak at 615-640nm is applied to the inner face of glass tube to give the aimed fluorescent lamp.
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