Patent ID: 8310141

Claim:
A fluorescent lamp comprising: a phosphor layer consisting of: a blue light-emission phosphor expressed by the following compositional formula: (Sr x ,Ba y ,Ca (1-x-y) ) 5 (PO 4 ) 3 Cl:Eu wherein 0≦x, y≦1 and x+y≦1, a green light-emission phosphor expressed by the following compositional formula: BAM:Eu,Mn, a red light-emission phosphor expressed by the following compositional formula: YVO 4 :Eu, and nitrocellulose; and an atmosphere in contact with the blue light-emission phosphor that contains argon (Ar), neon (Ne) and mercury (Hg) having a ratio shown by the following equation: A /( A+N )≧0.04 wherein A represents a mole fraction of argon and N represents a mole fraction of neon.