Synthesis and photoluminescence properties of new garnet-type red-emitting Li7La3-xZr2O12:xEu3+ phosphors. (1st April 2020) - Park, K.
Abstract: The structural and photoluminescence (PL) properties of as-synthesized and aged garnet-type Li7 La3- x Zr2 O12 : x Eu 3+ (0.02 ≤ x ≤ 0.10) phosphors for white light-emitting diode applications were systematically investigated. Li7 La3 Zr2 O12 oxides satisfied the criteria, proposed by F. C. Hawthorne, for the formation of garnet structure. Rietveld refinement results showed that the as-synthesized Li7 La3- x Zr2 O12 : x Eu 3+ phosphors formed a tetragonal crystal structure ( I 41 / acd space group) and emitted efficient red light. The aging of the Li7 La3- x Zr2 O12 : x Eu 3+ phosphors induced a gradual transition from the tetragonal to the cubic structure and formed a secondary phase Li2 CO3, which yielded a substantial decrease in PL excitation and emission intensities. Graphical abstract: Image, graphical abstract