| 摘要 |
PURPOSE:To make it possible to effectively recover a decrease in light output due to machining without a causing dimensional change and a damage by machining a specified fluorescent ceramic sinter activated with a rare earth element, followed by heat treatment. CONSTITUTION:A fluorescent ceramic sinter activated with a rare earth element, composed mainly of a rare earth oxysulfide of the formula (wherein M is at least one rare earth element) (e.g. Gd2O2S:Pr), is machined to give a workpiece of a desired shape. This workpiece is heated at 200-600 deg.C for at least 10min, preferably 1-15hr, preferably in a lowly oxidizing atmosphere or in an inert gas atmosphere.
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