在978nm激光二极管的激发下,Mo掺杂的TiO2材料表现出很强的宽带上转换发光,该发光来源于[MoO4]2-基团的激发态3T2,3T2能级到基态1A1能级的电子跃迁.X射线衍射表明样品为金红石单一相,红外吸收光谱证实了[MoO4]2-的存在.由光电子能谱推测体系中还含有低价态的Mo离子,它们提供了上转换得以进行的中间态.高温下的氧化还原处理会改变低价Mo的数量,从而严重影响样品的发光行为.
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