Patent ID: 8035288

Claim:
A material for preparing a protective layer of a plasma display panel (PDP), the material comprising: a magnesium oxide (MgO) powder comprising a cathode rays emission spectrum having a first emission peak in a wavelength in the range of 300 to 450 nm, a second emission peak in a wavelength in the range of 650 to 750 nm, and an intensity ratio between 1:0.15 and 1:0.40 of the second emission peak with respect to the first emission peak, wherein the MgO powder comprises 0.05% by weight of at least one impurity selected from the group consisting of nickel (Ni), ferrum (Fe), boron (B), silicon (Si), manganese (Mn), chrome (Cr), calcium (Ca), copper (Cu), zirconium (Zr), aluminum (Al) and sodium (Na).