U.S. Philips Corporation

Cornelis Wilhelmus Schetters

Willebrordus H Van De Spijker

Judicus M Verstegen

Marinus G Tak

Abraham Sonneveld

Luminescent aluminate with magnetoplumbite crystal structure, activated by cerium, by cerium and terbium or by cerium and manganese. The aluminate comprises at least one of the elements B, Si and P in a quantity of 0.001 to 0.20 mole per mole of aluminate which results in improved properties of luminescence. These aluminates are preferably used in low-pressure mercury vapor discharge lamps.

Luminescent aluminates and mercury vapor discharge lamp containing the

A luminescent screen, particularly for a low-pressure mercury vapor discharge lamp, provided with a luminescent thallium-activated aluminate having the .beta.-alumina structure and defined by the formula (Me.sup.I.sub.1.sub.-x.sub.-p Tl.sub.x Me.sup.II.sub.p) (Al.sub.11.sub.-y Mn.sub.y)O.sub.17 in which Me.sup.I represents at least one of the alkali metals sodium, potassium and rubidium, and in which Me.sup.II represents at least one of the alkaline earth metals calcium, strontium and barium, in which up to 50 mol % of aluminum may be replaced by gallium, and in which

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Eindhoven, Netherlands

Cornelis Wilhelmus Schetters