科研小组表示，这种磷光性的物质不需要放在阳光下直射。

The team said the phosphorescent substance did not need to be exposed to direct sunlight.

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在大量文献调研的基础上，根据发光基质的不同对目前非放射性长余辉红色磷光粉的研究现状进行了系统的分类介绍。

On the basis of studying many documents, introduced some non radioactive persistent red phosphors and systematically classified them according to their luminescent host.

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