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It was found that the lower photoluminescence of hydrothermal under excitation is mainly due to the presence of . The electron paramagnetic resonance spectra confirmed the existence of in hydrothermal , and the was difficult to eliminate completely by calcination in air. The emission spectra showed the induced redundant emission of . The results of an infrared study revealed hydrothermal contains some and only exists in hydrothermal phosphors which contain planar triangular groups. The was eliminated completely by calcination in a reducing atmosphere, and it greatly enhanced photoluminescence of hydrothermal in vacuum ultraviolet (VUV) region.
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Wang et al. (2006) studied this question.
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