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A cerium activated lutetium borate phosphor of the following formula (I) : [in-line-formulae](Lux, Lny)BO3 : aCe, bA (I) [/in-line-formulae] in which Ln is at least one rare earth element selected from the group consisting of Y, La and Gd; A is at least one element selected from the group consisting of Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb and Zr; and x, y, a and b are numbers satisfying the conditions of 0.5≦x<1, 0≦y<0.5, 0
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