| 摘要 |
A phosphor is prepared by conversion of a rare earth oxide, the rare earth element appearing in its normal trivalent state in the oxide but in its bivalent state in the phosphor. The conversion is achieved by initially mixing, in their dry solid states, the oxide with a reducing agent and then heating the mixture in a vacuum. The composition of the agent is such that it is oxidized and forms part of the phosphor. An appropriate reducing agent, by way of example, is silicon monoxide, in which case the resulting phosphor constitutes a rare earth silicate.
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