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掺铈YVO4晶体的上转换发光及其机理
作者:王友发 阮永丰 吴周礼 王帅 李文润 童红双 
单位:天津大学理学院 天津 300072 
关键词:掺铈钒酸钇晶体 光谱 电荷迁移态 上转换发光 提拉法 
分类号:O482;O614
出版年,卷(期):页码:2012,40(9):1305-1310
DOI:
摘要:

摘  要: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620 nm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。

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Abstract: Cerium doped YVO4 crystals were grown by the Czochralski method in a median-frequency induction furnace. Cerium carbonate and ceria were doped in the differential crystals at the concentration of 2% (in mole), respectively. The crystal samples were characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The results show that two crystal samples appear YVO4 crystallographic phase, and the Ce3+ ions and Ce4+ ions both coexist in two crystals. Their spectral characters are rather similar. The two samples both radiate a wideband blue light centered at 450 nm when excited by 620 nm light. It was assumed that this upconversion could be exited from the ground state of charge transfer state (CTS) that is the ground state of the CTS of Ce–O configuration rather than from the ground state 2F5/2 of Ce3+.

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基金项目:
作者简介:
第一作者:王友发(1984—),男,博士研究生。
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参考文献:

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