| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject composition capable of providing a highly efficient fluorescent lamp with the ability of increasing each radiation of visible and ultraviolet lights emitted therefrom, by optimizing each particle diameter of a fluorescent material light-emissive in the visible region and another fluorescent material light-emissive in the ultraviolet region. SOLUTION: This composition comprises (A) a visible light-emitting fluorescent material having its main luminous wavelength in the visible region and (B) an ultraviolet light-emitting fluorescent material having its main luminous wavelength in the ultraviolet region wherein each average particle diameter of the components A and B is 2 to 5μm and 1.5 to 3.5μm, respectively. Preferably, the ratio of the component B to the objective composition is 1 to 20 wt.%. Preferably, the component A comprises a mixture of at least two kinds selected from the group consisting of (SrCaBaMg)5 (PO4 )3 Cl:Eu, BaMg2 Al16 O27 :Eu, LaPO4 : Ce, Tb, and the chromaticity of the mixture lies in the while light region. The component B is pref. selected from the group consisting of BaSi2 O5 :Pb, SrB4 O7 : Eu, YPO4 :Ce and MgAl11 O14 :Ce.
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