Silicon dioxide selectively reflecting layer for mercury...

Details Silicon dioxide selectively reflecting layer for mercury... Silicon dioxide selectively reflecting layer for mercury...

H - Electricity

01

J

313/136

H01J 1/62 (2006.01) H01J 61/35 (2006.01)

Patent

CA 1296379

ABSTRACT OF THE DISCLOSURE An improved mercury vapor discharge lamp is disclosed. The lamp of the present invention includes an envelope and a selectively reflecting silicon dioxide layer on at least a portion of the inner surface of the envelope. The lamp further includes a phosphor coating disposed on the selectively reflecting layer. The silicon dioxide layer has a coating weight of from about 0.1 to about 4 mg/cm2. The selectively reflecting layer comprises at least about 80 weight percent silica having a primary particle size from about 5 to about 100 nm with at least about 50 weight percent of the silica having a primary particle size from about 17 to about 80 nm.

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