Enhancing the sensitization efficiency of erbium doped organic complexes by heavy halogen substitution

J. X. Hu; S. Karamshuk; J. Gorbaciova; H. Q. Ye; H. Lu; Y. P. Zhang; Y. X. Zheng; X. Liang; M. Motevalli; I. Abrahams; I. Hernández; P. B. Wyatt; W. P. Gillin

doi:10.1039/C8TC00971F

Enhancing the sensitization efficiency of erbium doped organic complexes by heavy halogen substitution

J. X. Hu, S. Karamshuk, J. Gorbaciova, H. Q. Ye, H. Lu, Y. P. Zhang, Y. X. Zheng, X. Liang, M. Motevalli, I. Abrahams, I. Hernández, P. B. Wyatt, W. P. Gillin

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Abstract

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.

Original language	English
Pages (from-to)	7012-7017
Number of pages	6
Journal	Journal of Materials Chemistry C
Volume	6
Issue number	26
DOIs	https://doi.org/10.1039/C8TC00971F
State	Published - 2018
Externally published	Yes

Funding

J. X. H., H. Q. Y., H. L. and Y. P. Z. were financially supported by the China Scholarship Council and Queen Mary University of London (QMUL). S. K. was supported by a Proof of Concept grant funded by QMUL and the EPSRC through the Silicon Photonics for Future Systems grant EP/L00044X. J. G. was financially supported by QMUL. I. H. acknowledges financial support from the Spanish Ministerio de Economia y Competi-tividad (Grant: MAT2016-80438-P). Y. Z. acknowledges financial support from the Major State Basic Research Development Program (2013CB922101) and NSFC (21371093). W. P. G. acknowledges financial support from EPSRC (EP/L020114/1 and EP/P007767/1) and from NSFC (61574095). We are grateful to the EPSRC UK National Mass Spectrometry Facility at Swansea University for spectra.

Funders	Funder number
Spanish Ministerio de Economia y Competi-tividad	MAT2016-80438-P
Queen Mary University of London
Engineering and Physical Sciences Research Council	EP/L00044X, EP/L020114/1, EP/P007767/1
National Natural Science Foundation of China	61574095, 21371093
China Scholarship Council
Major State Basic Research Development Program of China	2013CB922101

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Hu, J. X., Karamshuk, S., Gorbaciova, J., Ye, H. Q., Lu, H., Zhang, Y. P., Zheng, Y. X., Liang, X., Motevalli, M., Abrahams, I., Hernández, I., Wyatt, P. B., & Gillin, W. P. (2018). Enhancing the sensitization efficiency of erbium doped organic complexes by heavy halogen substitution. Journal of Materials Chemistry C, 6(26), 7012-7017. https://doi.org/10.1039/C8TC00971F

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abstract = "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.",

author = "Hu, {J. X.} and S. Karamshuk and J. Gorbaciova and Ye, {H. Q.} and H. Lu and Zhang, {Y. P.} and Zheng, {Y. X.} and X. Liang and M. Motevalli and I. Abrahams and I. Hern{\'a}ndez and Wyatt, {P. B.} and Gillin, {W. P.}",

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year = "2018",

doi = "10.1039/C8TC00971F",

language = "English",

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T1 - Enhancing the sensitization efficiency of erbium doped organic complexes by heavy halogen substitution

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AU - Karamshuk, S.

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AU - Ye, H. Q.

AU - Lu, H.

AU - Zhang, Y. P.

AU - Zheng, Y. X.

AU - Liang, X.

AU - Motevalli, M.

AU - Abrahams, I.

AU - Hernández, I.

AU - Wyatt, P. B.

AU - Gillin, W. P.

PY - 2018

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N2 - 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.

AB - 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.

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Enhancing the sensitization efficiency of erbium doped organic complexes by heavy halogen substitution

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