(57) Provided are a phosphor composition for a plasma display panel (PDP) including: a phosphor component which is composed of a zinc silicate-based phosphor represented by the formula of Zn₂SiO₄:Mn or of a mixture of the zinc silicate-based phosphor represented by the formula of Zn₂SiO₄:Mn and at least one further phosphor; and a continuous crystalline metal oxide layer composed of at least one positively charged metal oxide formed on the phosphor component, particularly composed of yttrium oxide (Y₂O₃), and a PDP having a phosphor layer composed of the phosphor composition. The phosphor composition for a PDP has a continuous crystalline layer composed of a positively charged metal oxide such as yttrium oxide, and thus has better surface properties. The metal oxide layer acts as a protecting layer to prevent deterioration of the phosphor due to ion bombardment. When the phosphor composition is used to manufacture a green phosphor layer for a PDP, a green discharge voltage can be controlled to levels of red and blue colours due to a better surface charge property and a poor specific gradation discharge problem can be resolved.