Abstract
Novel Eu2+ and Mn2+ doped fluorapatite-type Sr3YLi(PO4)3F powder materials have been synthesized via high temperature solid state reaction. The samples are characterized by X-ray diffraction (XRD), scanning electric microscopy (SEM), photoluminescence (PL) and photoluminescence excitation (PLE) spectra. Eu2+ single doped Sr3YLi(PO4)3F host displays a blue emission ranging from 400 to 550 nm centered at 439 nm, and exhibits a broad excitation band varying from 225 to 425 nm which matches with commercial n-UV LEDs (360–410 nm). Under near-UV light irradiation in the range from 270 to 410 nm, Eu2+ and Mn2+ co-doped Sr3YLi(PO4)3F phosphors show two emission bands centered at 439 and 565 nm, respectively. The relative intensity ratio of Eu2+ and Mn2+ can be changed by increasing the amount of Mn2+ ions, the emission color can be regulated from blue to white. The energy transfer process from Eu2+ to Mn2+ has been proved to the resonant type through the quadrupole–quadrupole interaction mechanism. It is important that the white light emission can be gained by modulating the relative contents of Eu2+ and Mn2+ ions in Sr3YLi(PO4)3F host. Base on the obtained results, the as-prepared phosphors might be applied as a candidate for white LEDs.
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Acknowledgements
The authors acknowledge the financial support from the National Natural Science Foundation of China (No. 21671045), and the Special Funds for University Discipline and Specialty Construction of Guangdong Province, China (No. 2016KQNCX041).
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Lv, Y., Jin, Y., Wang, C. et al. A novel tunable color emitting phosphor Sr3YLi(PO4)3F:Eu2+, Mn2+ for near-UV white LEDs based on the energy transfer from Eu2+ to Mn2+ . J Mater Sci: Mater Electron 28, 19139–19147 (2017). https://doi.org/10.1007/s10854-017-7870-x
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DOI: https://doi.org/10.1007/s10854-017-7870-x