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Hexagonal, Lanthanoid, Photoluminescence spectra
Al-Eu-N-O-Si
Al-Ba-Eu-Mg-O
Ba-Cl-Eu-Gd-O-P
Al-Ba-Eu-Mg-O-Si
Ba-Cl-Eu-La-O-P
lanthanoid
rare earth
luminescent
nonmetal
chalcogen