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Molten salt synthesis and luminescence performance of the Ce 3+ /Eu 2+ doped Sr 3 Y 2 Ge 3 O 12 phosphors

Journal of Luminescence, ISSN: 0022-2313, Vol: 240, Page: 118406
2021
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The Ce 3+ and/or Eu 2+ doped inorganic phosphors with the broad excitation bands and efficient visible emission play the important roles in the light emitting diodes. Herein, we synthesized the Ce 3+ /Eu 2+ doped Sr 3 Y 2 Ge 3 O 12 phosphors via a molten salt method under a reducing atmosphere. The phosphors were investigated by the X-ray diffraction, scanning electron microscopy, transmission electron microscopy and fluorescence spectrophotometer. The thermal stability of the Sr 2.91 Ce 0.03 Eu 0.06 Y 2 Ge 3 O 12 phosphor was evaluated in 300–500 K at a temperature interval of 25 K. Upon the excitation at 450 nm, the Sr 2.97 Ce 0.03 Y 2 Ge 3 O 12 and Sr 2.97 Eu 0.03 Y 2 Ge 3 O 12 phosphors emit green and yellow-red light, respectively. The energy transfer process from Ce 3+ to Eu 2+ occurs in Ce 3+ /Eu 2+ codoped Sr 3 Y 2 Ge 3 O 12 phosphors, which results in the tunable luminescence.

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