U.S. Philips Corporation

Joseph Lauter

Helmut Bechtel

Markus Haase

Wolfram Czarnojan

Walter Mayr

The invention relates to a display screen comprising a phosphor composition of a sulphide and/or selenide-containing phosphor which is provided with a coating which comprises molybdenum (VI)-trioxide. In such display screens, the advantages of the efficient sulphide or selenide-containing phosphors can be used and said display screens remain bright and rich in contrast for a long period of time because the coating, which comprises molybdenum (VI)-trioxide, surprisingly acts as a stabilizing protective coating which limits the corrosion processes in sulphide and/or selenide-containing phosphors induced by low-energy radiation.

Luminescent screen containing phosphor particles coated with MoO.sub.3

The invention relates to a display screen comprising a phosphor composition of a sulphide and/or selenide-containing phosphor which is provided with a coating which comprises one or more catena-polyphosphates of one or more alkaline earth metals, zinc, cadmium and/or manganese. In such a display screen, in particular a low-energy cathode ray display screen, the advantages of the efficient sulphide or selenide-containing phosphors can be used and said display screen remains bright and rich in contrast for a long period of time because the coating acts as a stabilizing protective coating which limits the corrosion processes in sulphide and/or selenide-containing phosphors induced by low-energy radiation.

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Aachen, Germany

Joseph Lauter