H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/7, 313/81
H01J 61/52 (2006.01) C09K 11/77 (2006.01) H01J 61/44 (2006.01)
Patent
CA 1060940
ABSTRACT OF THE DISCLOSURE Color correction is provided in a high-pressure mercury vapor lamp without significant reduction in lamp lumen output. A cerium-activated yttrium aluminate phosphor material is blended with the conventional red- emitting phosphors customarily employed, such as europium- activated yttrium vanadate and europium-activated yttrium vanadate phosphate. The color-correcting phosphor additive is efficiently excited in its main absorption band at the 420-460 nm. region of the visible spectrum, thereby absorbing part of the 436 nm. Hg line, as is necessary to improve the color rendering index. The emission in the yellow-green spectrum of the phosphor additive corresponds to the maximum eye-sensitivity region, thereby contributing to the lumen output of the mercury vapor lamp coated with this phosphor blend. The class of cerium-activated yttrium aluminate phosphor additive used is identified by the general formula: (Y(1-x)Cex)3 Al5O12 with x having an approximate value in the range 0.004 to 0.020. The proportion of the phosphor additive ranges from a small but effective amount up to approximately 30 weight percent of the phosphor blend with a red-emitting phosphor.
254057
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