Method of coating a luminescent material

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

1995-08-08

1998-09-22

Bell, Janyce

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427215, 427380, B05D 506

Patent

active

058111549

ABSTRACT:
The invention relates to a method of coating a luminescent material with a 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. The invention also relates to a coated luminescent material and to a low-pressure mercury discharge lamp.
According to the invention, 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: 4946707 (1990-08-01), Kasenga et al.
patent: 5196229 (1993-03-01), Chau
patent: 5368886 (1994-11-01), Tono et al.
patent: 5382452 (1995-01-01), Bruno et al.

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