FLUORESCENT LAMP

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PROBLEM TO BE SOLVED : To provide a fluorescent lamp having a superior light flux of lamp and color rendering property by using a rare earth niobate phosphor which is excited efficiently by ultraviolet rays and emits red light. SOLUTION : The fluorescent lamp comprises a translucent airtight container, a phosphor layer formed in the translucent airtight container, a discharge medium filled and sealed in the translucent airtight container, and an electrode. The phosphor layer includes a rare earth niobate phosphor which has as a basic constituent element at least one kind of element selected from yttrium, lanthanum, gadolinium, lutetium, terbium, and scandium, europium, niobium, and at least one kind of element selected from vanadium and tantalum, and oxygen, and in which the ratio of mol number of europium against the total mol number of the rare earth elements contained in the phosphor is 0.0001 or more and 0.5 or less, and the ratio of mol number of niobium against the total mol number of niobium, vanadium, and tantalum is 0.5 or more and 1.0 or less. COPYRIGHT : (C)2006, JPO&NCIPI