Abstract
Light emission from the first excited state of ions in the orthorhombic red phosphor is reported. The hydrate phosphor is synthesized from metallic tin by wet chemical etching in aqueous solution. Vacuum evacuation, immersion in methanol, or heating in air leads to partial dehydration of this hydrate phosphor. The dehydration-induced lattice deformation results in the splitting of the -related emission lines, together with an enhancement of the zero-phonon line emission intensity. The partially dehydrated state returns to the rehydrated state in air at room temperature within a day. Such unique photoluminescent properties have not been observed previously in any other phosphor or luminescent material.
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