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Site occupancy and phonon sideband of trivalent europium doped calcium aluminosilicate phosphors
Site occupancy and phonon sideband of trivalent europium doped calcium aluminosilicate phosphors
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Date
2021
Authors
Nguyen Thi Quynh Lien
Ho Van Tuyen
Nguyen Ha Vi
A.N.H. Thuan
Phan Van Do
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Abstract
A series of Eu3+ doped Ca2Al2SiO7 were synthesized by the solid-state reaction method. Structural
and luminescent properties of the obtained samples were investigated through X-ray diffraction,
Raman and luminescence spectra. The luminescent characteristic of the 5D0 → 7F0,1 transitions
from emission spectra of Eu3+ ions showed that the Eu3+ ions occupy at two different sites in
Ca2Al2SiO7 lattice. The Ca2Al2SiO7:Eu3+ red phosphors have three phonon sidebands with energies
~673 cm 1, 848 cm 1 and 1443 cm 1 which have been determined via the excitation
spectra of Eu3+ ions in Ca2Al2SiO7 materials. These obtained phonon energies coincided with the
vibrational energies observed from Raman spectra. The multiphonon relaxation rates for the
excited levels of 5D1, 5D2 and 5D3 of Eu3+ ions in Ca2Al2SiO7 were also calculated.
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Keywords
Phonon sideband,
Solid-state reaction,
Site occupancy,
Aluminosilicate