Host Sensitization of Tb3+ Ions in Tribarium Lanthanide Borates Ba3Ln (BO3)3 (Ln = Lu and Gd)

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• 作者：De-Yin Wang ; Teng-Ming Chen ; Bing-Ming Cheng
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：March 5, 2012
• 年：2012
• 卷：51
• 期：5
• 页码：2961-2965
• 全文大小：354K
• 年卷期：v.51,no.5(March 5, 2012)
• ISSN：1520-510X

文摘

The vacuum-ultraviolet (VUV) spectroscopic properties of undoped and Tb³⁺-doped borates Ba₃Ln(BO₃)₃ (Ln = Lu and Gd) with different crystal structures were investigated by using synchrotron radiation. Ba₃Lu(BO₃)₃ (BLB) crystallizes in a hexagonal structure, whereas Ba₃Gd(BO₃)₃ (BGB) crystallizes in a trigonal structure. The maximum host absorption for BLB and BGB was found to locate at 179 and 195 nm, respectively. Upon host excitation, BLB exhibits an intrinsic broad UV emission centered at 339 nm, which is attributed to the recombination of self-trapped excitons that may presumably be associated with band-gap excitations or molecular transitions within the BO₃^{3鈥?/sup> group. In contrast to BLB, no broad emission but line emission ascribed to a Gd3+6P_J鈥?sup>8}S_7/2 transition was observed in the emission spectrum of BGB. Upon doping of Tb³⁺ ions into the hosts of BLB and BGB, an efficient energy transfer from the host excitations to Tb³⁺ via host/Gd³⁺ emission was observed, showing that host sensitization of Tb³⁺ occurs in these rare-earth borates.