In his comment, Cates (1) believes that Er 3+ :YAlO 3 is not capable of emitting significant amounts of UV via upconversion and the UV may be "artefactual"; (2) suspects that the LED light source may include emissions tailing into the UV range. Accordingly, we provide more detailed results regarding fluorescence spectrum, light source spectrum and photocatalytic activity of Er 3+ :YAlO 3 /TiO 2 at the following two aspects to debate Cates's query.
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