Electroluminescent phosphor particles encapsulated with an aluminum oxide based multiple oxide coating

摘要

Encapsulated electroluminescent phosphor particles and a method of making same. Each phosphor particle is encapsulated by a substantially transparent aluminum oxide-based multiple oxide coating. The encapsulated phosphors exhibit high initial luminescent brightness and high resistance to humidity-accelerated decay of luminescent brightness. The aluminum oxide-based coating provides reduced sensitivity to chemical degradation caused by exposure to condensed moisture or otherwise liquid water. The coating comprises the aluminum oxide and at least one other metal oxide.