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在YVO4晶体中分别掺入摩尔分数为2%的Ce2(CO3)3和CeO2,在中频感应加热炉中采用提拉法生长了掺Ce的Ce:YVO4晶体。用X射线衍射测试了这两种晶体的物相,发现两种样品都主要以YVO4相存在。X射线光电子能谱测试表明,在两种样品中铈离子都是以+3、+4混合价态的形式出现的。光谱测试表明,两种样品的光谱特性非常相似,同时发现,两种方式掺杂的Ce:YVO4晶体在620 nm的光激发下,均可发出以450 nm为中心的蓝色宽带荧光。分析认为,在Ce:YVO4晶体中由620nm引发的上转换发光的激发过程,不可能直接起源于Ce3+的基态2F5/2,它起源于由特殊的“Ce-O”构型形成的电荷迁移态的基态。
In the YVO4 crystal, Ce2 (CO3) 3 and CeO2 with mole fraction of 2% were respectively doped, and Ce-doped Ce: YVO4 crystal was grown by Czochralski method in a medium frequency induction heating furnace. The phases of these two crystals were tested by X-ray diffraction and it was found that both samples were mainly present as YVO4 phase. X-ray photoelectron spectroscopy showed that cerium ions appeared in the form of + 3, + 4 mixed valences in both samples. Spectral tests showed that the spectral characteristics of the two samples were very similar. At the same time, it was found that the two kinds of doped Ce: YVO4 crystals emit blue broadband fluorescence centered at 450 nm under the excitation of 620 nm. It is considered that the excitation up-conversion excited by 620 nm in Ce: YVO4 crystal can not originate directly from the ground state 2F5 / 2 of Ce3 +, which originated from the charge formed by the special “Ce-O” configuration Migration of the ground state.