Enhancing the sensitization efficiency of erbium doped organic complexes by heavy halogen substitution
Enhancing the sensitization efficiency of erbium doped organic complexes by heavy halogen substitution
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DOI：
10.1039/c8tc00971f
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发表时间：
2018-07
影响因子：
6.4
通讯作者：
J. X. Hu;S. Karamshuk;J. Gorbaciova;H. Ye;Hengyi Lu;Yuanpeng Zhang;You‐Xuan Zheng;X. Liang;M. Motevalli;I. Abrahams;I. Hernández;P. B. Wyatt;W. Gillin
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文献类型：
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作者：
J. X. Hu;S. Karamshuk;J. Gorbaciova;H. Ye;Hengyi Lu;Yuanpeng Zhang;You‐Xuan Zheng;X. Liang;M. Motevalli;I. Abrahams;I. Hernández;P. B. Wyatt;W. Gillin
具有有机配体的镧系配合物由于通过天线效应敏化镧系离子的可能性而受到关注。我们最近已经表明，2-（3，4，5，6-四氟-2-羟基苯基）-4，5，6，7-四氟苯并噻唑的锌（II）盐，Zn（FBTZ）2，可以提供非常高水平的敏化有机铒配合物，同时保持非常高的量子产率的铒近红外发光。本文报道了2-（3，4，5，6-四氟-2-羟基苯基）-6-氯-4，5，7-三氟苯并噻唑和2-（3，4，5，6-四氟-2-羟基苯基）-6-溴-4，5，7-三氟苯并噻唑锌盐的光谱性质。与完全氟化的发色团相比，将单个氯原子取代到发色团中足以使敏化效率加倍。该结果意味着实现铒离子布居数反转所需的泵浦强度降低50%。
Lanthanide complexes with organic ligands have been of interest due to the possibility of sensitising lanthanide ions through the antenna effect. We have recently shown that the zinc(II) salt of 2-(3,4,5,6-tetrafluoro-2-hydroxyphenyl)-4,5,6,7-tetrafluorobenzothiazole, Zn(FBTZ)2, can provide very high levels of sensitisation to organic erbium complexes whilst maintaining very high quantum yields for the erbium near-infra-red luminescence. We now report the spectroscopic properties of the zinc(II) salts of 2-(3,4,5,6-tetrafluoro-2-hydroxyphenyl)-6-chloro-4,5,7-trifluorobenzothiazole and 2-(3,4,5,6-tetrafluoro-2-hydroxyphenyl)-6-bromo-4,5,7-trifluorobenzothiazole. The substitution of a single chlorine atom into the chromophore is sufficient to double the sensitisation efficiency compared to the fully fluorinated chromophore. This result implies a 50% reduction in the pump intensity needed to achieve population inversion in the erbium ions.