ARC DISCHARGE LAMP HAVING A THIN CONTINUOUS FILM OF INDIUM OXIDE ON THE INNER SURFACE THEREOF
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Abstract
An arc discharge lamp has a clear glass envelope on the inner surface of which is disposed a thin, continuous film of indium oxide. The film transmits visible light but absorbs ultraviolet radiation. A phosphor coating may be disposed on the indium oxide film. In order to form the film, a solution of an indium salt of a pre-selected organic acid is applied to the glass, dried under controlled conditions and heated to a predetermined temperature to convert the indium salt to indium oxide.
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