Enhancing the sensitization efficiency of erbium doped organic complexes by heavy halogen substitution. Issue 26 (21st June 2018)

• Record Type: Journal Article
• Authors: 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.
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 26(2018)
• Page Start: 7012
• Page End: 7017
• Publication Date: 2018-06-21
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8tc00971f
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Photosensitisation of IR luminescence from an organic erbium complex is much greater with Zn(Cl-FBTZ)2 than with Zn(FBTZ)2 . 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.