Near-infrared luminescent erbium complexes with 8-hydroxyquinoline-terminated hyperbranched polyester

Publication date: 24 March 2017
Source:Polymer, Volume 113
Author(s): Dan Liu, Chengjian Li, Yaling Xu, Dapeng Zhou, Hongmei Wang, Ping Sun, Huasheng Jiang
Novel 8-hydroxyquinoline-terminated hyperbranched polyesters (1-HBPQ and 2-HBPQ) were synthesized and characterized by ¹H-NMR and UV-Vis analyses. Then, two erbium complexes (1-HBPQ-Er³⁺-HQ and 2-HBPQ-Er³⁺-HQ) were prepared by using 1-HBPQ or 2-HBPQ as the macromolecular ligand and 8-hydroxyquinoline (HQ) as a second ligand. The FTIR spectra and UV-Vis absorption spectra confirmed that both the macromolecular ligand and the second ligand were successfully coordinated with Er³⁺ ions. The erbium complexes emitted intense near-infrared luminescence at about 1530 nm, which corresponds to the ⁴I13/2-⁴I15/2 transition of Er³⁺ ions. Moreover, their full width at half maximum (FWHM) values were greater than 80 nm. The erbium complexes exhibited good solubility in conventional solvents and excellent near-infrared luminescence properties, indicating their promising potential as gain medium materials in optical amplification devices.

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