Luminescent material for mercury discharge lamp including phosph

Details Luminescent material for mercury discharge lamp including phosph Luminescent material for mercury discharge lamp including phosph

1994-07-29

1997-02-18

Patel, Nimeshkumar

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313486, 313487, H01J 6144

Patent

active

056043961

ABSTRACT:
A luminescent material for a mercury discharge lamp comprises a phosphor material including phosphor particles for emitting a luminous flux upon excitation by ultraviolet radiation at 254 nm and a protective layer continuously formed on the phosphor particle with at least one metal oxide selected from the group consisting of MgO, Y.sub.2 O.sub.3, La.sub.2 O.sub.3, Sm.sub.2 O.sub.3, Gd.sub.2 O.sub.3, Dy.sub.2 O.sub.3, Ho.sub.2 O.sub.3, Er.sub.2 O.sub.3, Yb.sub.2 O.sub.3, Lu.sub.2 O.sub.3, CaO, ZrO.sub.2, SrO, BaO, .alpha.-Al.sub.2 O.sub.3 and BeO. A mercury discharge lamp has a luminescent layer coated with the luminescent material on the wall of the light transmissive bulb thereof.

REFERENCES:
patent: 5289081 (1994-02-01), Tamatani et al.

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