The present invention provides a fluorescent substance represented by the following general formula: (A.sub.1-xB.sub.x).sub.2Si.sub.2O.sub.7, wherein A is at least one member selected from the group consisting of Gd, Y, Lu and La, B is at least one member selected from the group consisting of rare earth elements other than A and x is a numerical value specified by the formula: 0

 
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