Moisture resistant electroluminescent phosphor with high initial brightness and method of making
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United States of America Patent
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Oct 30, 2012
Grant Date -
Jul 26, 2007
app pub date -
Jan 12, 2007
filing date -
Jan 26, 2006
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Abstract
An electroluminescent (EL) phosphor is described wherein each individual phosphor particle is encapsulated in an inorganic coating, preferably aluminum oxyhydroxide. The encapsulated phosphor shows an extreme insensitivity to atmospheric moisture and suffers only minor loss of initial brightness in lamps. The method of applying the coating is a hybrid process, which involves EL phosphor particles first being coated with a thin inorganic film using an atomic layer deposition (ALD) method in a fluidized bed wherein the precursors are introduced sequentially in repeated cycles, subsequently followed by an additional coating layer applied by a chemical vapor deposition (CVD) method in which the precursors are introduced simultaneously.
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