3 wavelength area luminous forma fluorescent lamps

摘要

PURPOSE: To obtain a fluorescent lamp having high color rendering properties and a high efficiency and reduced in aging with time. ;CONSTITUTION: The three-wavelength-region-emission fluorescent lamp having a fluorescent film made of a luminescent composition comprising a bivalent europium and manganese-coactivated alkaline earth metal aluminate phosphor represented by the formula: Ba_1-x-ySr_xEu_yMg_1-zMn_zAl₁₀O₁₇ (wherein x, y and z are in the ranges: 0.1≤x≤0.4, 0.075≤y≤0.4, and 0.005≤z≤0.05).;COPYRIGHT: (C)1996,JPO