FLUORESCENT SUBSTANCE AND LIGHT EMITTING DEVICE

摘要

The present invention provides a phosphor that has high luminance, a property of low luminance degradation during PDP driving, and chromaticity y comparable to that of BAM:Eu. The present invention is the phosphor that is represented by the general formula xAO €¢ y 1 EuO €¢ y 2 EuO 3/2 €¢ DO €¢ zSiO 2 €¢ wCaCl 2 wherein A is at least one selected from Sr and Ba, D is at least one selected from Mg and Zn, and 2.970‰ x‰ 3.500, 0.001‰ y 1 +y 2 ‰ 0.030, 1.900‰ z‰ 2.100, and 0.001‰ w‰ 0.100 are satisfied, and that has 50 mol % or less of the divalent Eu ratio (ratio of the divalent Eu element to the total of the Eu elements) in the vicinity of the surface of the phosphor particle.