Compositions and methods for modifying lumen maintenance characteristics of phosphor-containing coatings

A method for improving the lumen maintenance of a fluorescent lamp, the method comprising:

• providing a phosphor blend containing a first phosphor that exhibits a poorer lumen maintenance than at least a second phosphor in the phosphor blend;
• and
• forming with the phosphor blend a phosphor-containing coating of a fluorescent lamp, wherein the phosphor-containing coating contains an additive composition in a sufficient amount and sufficiently uniformly distributed to improve the lumen maintenance of the first phosphor;
• wherein the forming step comprises:
• combining the phosphor blend with a liquid vehicle that contains at least one soluble salt of the additive composition;
• and
• converting the soluble salt to the additive composition.

A method for improving the lumen maintenance of a fluorescent lamp, the method comprising:

• forming a phosphor-containing coating to contain at least a first phosphor that depreciates during operation of the fluorescent lamp;
• and
• forming the phosphor-containing coating to further contain an additive composition in a sufficient amount and sufficiently uniformly distributed in the phosphor-containing coating to inhibit depreciation of the first phosphor during operation of the fluorescent lamp;
• wherein the step of forming the phosphor-containing coating to further contain an additive composition comprises:
• combining a phosphor blend with a liquid vehicle that contains at least one soluble salt of the additive composition;
• and
• converting the soluble salt to the additive composition.