Uv-emitting phosphors, phosphor blend and lamp containing same

Details Uv-emitting phosphors, phosphor blend and lamp containing same Uv-emitting phosphors, phosphor blend and lamp containing same

H - Electricity

01

J

H01J 1/62 (2006.01) H01J 63/04 (2006.01)

Patent

CA 2623695

There are provided UV-emitting phosphors, a phosphor blend and a lamp containing same. The blend is comprised of a mixture of a YPO4:Ce phosphor and a LaPO4:Ce phosphor. The YPO4:Ce and LaPO4:Ce phosphors may be surface treated to increase their isoelectric point to enhance lamp stabilization. A third phosphor having an isoelectric point that is at least 3 pH units higher than either of the YPO4:Ce and LaPO4:Ce phosphors also may be added to improve lamp stabilization time. The phosphor blend is lead-free and lamps containing the blend provide equivalent performance to state-of-the-art tanning lamps.

L'invention concerne des phosphores émetteurs d'UV, un mélange de phosphores et une lampe renfermant ceux-ci. Le mélange comprend un phosphore YPO4:Ce et un phosphore LaPO4:Ce. Les phosphores YPO4:Ce et LaPO4:Ce peuvent être traités en surface aux fins d'accroissement de leur point isoélectrique, de manière à améliorer la stabilisation de la lampe. Un troisième phosphore possédant un point isoélectrique supérieur d'au moins 3 unités de pH à l'un ou l'autre des phosphores YPO4:Ce et LaPO4:Ce peut être ajouté afin d'améliorer le temps de stabilisation de la lampe. Le mélange de phosphores est exempt de plomb et les lampes renfermant le mélange présentent des performances équivalentes à celles des lampes de bronzage de pointe.

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