Infrared to visible upconversion luminescence of trivalent erbium tetrafluoroborate complexes

Karina Nigoghossian, Tsumugi Miyashita, Asuto Omura, Gil Yeroslavsky, Doan Thi Kim Dung, Kyohei Okubo, Masakazu Umezawa, Masao Kamimura, Kohei Soga

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Upconverting erbium(III) complexes in N, N-dimethylformamide (DMF) were prepared via chloride ligand replacement by tetrafluoroborate, as suggested by changes in the spectral profile. Cl- removal as precipitated salts was evidenced by X-ray diffraction (XRD) analysis. The systematic spectroscopic work indicated optimal condition for complex preparation. Ions in the coordination site were controlled by adjusting the water phase, thus the amount of removed chloride salts. Maximum emission intensity, lower red-to-green ratio and narrower emission lines were achieved at molar ratios Er3+:BF4- = 1:7 and H2O:DMF = 0.23. Studies extended to downshifted luminescence of Eu3+-complex provided more evidences of effective BF4- coordination, through dependence of relative intensities between 5D0 electric dipole and magnetic dipole (5D07F1) transitions. Infrared spectra suggest BF4- coordination to RE.

Original languageEnglish
Pages (from-to)1749-1766
Number of pages18
JournalOptical Materials Express
Issue number10
Publication statusPublished - 1 Jul 2020


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