该金属氧化物层起保护层的作 用，以防止因离子轰击而破坏该磷光体。
The metal oxide layer acts as a protecting layer to prevent deterioration of the phosphor due to ion bombardment.
用于PDP的该磷光体具有由带正电金属氧化物例如氧化钇构 成的连续晶体层，并因此具有较好的表面特性。
The phosphor 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.
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