Method of coating a luminescent material

The invention relates to a method of coating a luminescent material with a layer of a metal oxide M2O3 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,...

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Bibliographische Detailangaben
Hauptverfasser:	WEILER, VOLKER U, JOHNEN, ANNETTE, PEEK, JOHANNES A. F, RONDA, CORNELIS R, VAN KEMENADE, WILHELMUS M. P
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES ADVERTISING APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND,DEAF OR MUTE BASIC ELECTRIC ELEMENTS CHEMISTRY CRYPTOGRAPHY DIAGRAMS DISPLAY DYES EDUCATION EDUCATIONAL OR DEMONSTRATION APPLIANCES ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS ELECTRICITY GLOBES GYROSCOPIC INSTRUMENTS MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE MEASURING MEASURING DISTANCES, LEVELS OR BEARINGS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NAVIGATION PAINTS PHOTOGRAMMETRY OR VIDEOGRAMMETRY PHYSICS PLANETARIA POLISHES SEALS SIGNALLING SURVEYING TESTING TRAFFIC CONTROL SYSTEMS
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Beschreibung
Zusammenfassung:	The invention relates to a method of coating a luminescent material with a layer of a metal oxide M2O3 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.