Method of coating a luminescent material

Details Method of coating a luminescent material Method of coating a luminescent material

1998-06-19

2000-11-21

Patel, Ashok

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313489, 428389, 2523014R, B32B 3300, H01J 6144

Patent

active

061507571

ABSTRACT:
A luminescent material coated with a crystalline layer of a metal oxide M.sub.2 O.sub.3 wherein a metal M is chosen from the group formed by Y and Al is shown. According to this method the luminescent material is first introduced into a solution of a salt of the metal M, then a compound of the metal M is deposited on the luminescent material through homogeneous precipitation, and subsequently the luminescent material is separated from the solution, dried, and heated. It is achieved thereby that the luminescent material will absorb mercury to a low degree only, and that accordingly the color point of a low-pressure mercury discharge lamp whose luminescent layer comprises a luminescent material coated in accordance with the invention only shows a small shift as the lamp ages.

REFERENCES:
patent: 5087523 (1992-02-01), Sigai et al.
patent: 5220243 (1993-06-01), Klinedinst et al.
patent: 5604396 (1997-02-01), Watanabe et al.

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