Abstract
A novel luminescent material Sr5(BO3)3F:x%Eu3+ was synthesized for the first time by a high temperature solid phase reaction in an air atmosphere. The luminescence properties and site occupancy of Sr5(BO3)3F:x%Eu3+ phosphors were studied. The XRD powder diffraction data imply that the series of targets synthesized are pure phases. After repeated experiments, it was found that the main peak position of the excitation and emission spectra changed greatly when the same concentration or different concentration of Eu3+ was doped, and two kinds of spectral phenomena appeared. First, the position of the broadband excitation peak is about 335 nm, and the position of the strongest emission peak belongs to the 5D0→7F0 transition of Eu3+ at 572 nm. Second, the position of the broadband excitation peak is about 275 nm, and the position of the strongest emission peak belongs to the 5D0→7F2 transition of Eu3+ at 619 nm. These imply that different lattice sites are occupied by Eu3+ in Sr5(BO3)3F. At the same time, the unusually strong 5D0→7F0 transition illustrates the presence of interstitial oxygen and anomalous crystal field strength in system. A theoretical calculation method of bond energy was applied to study the site occupancy of Eu3+, which shows that any one of Sr1, Sr2, and Sr3 has the possibility of being occupied by Eu3+. Therefore, our test results are consistent well with the theoretical analysis.
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