Luminescence properties of Eu2+ in M2MgSi2O7 (M=Ca, Sr, and Ba) phosphors |
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Authors: | T Kim Y Kim and S Kang |
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Institution: | (1) Department of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Republic of Korea; |
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Abstract: | The photoluminescence properties of alkali-earth magnesium silicates (M2MgSi2O7, M=Ca, Sr, and Ba) doped with Eu2+ were investigated. Solid solutions of Ba
x
Sr2−x
Si2O7, Ca2MgSi2O7, and Sr2MgSi2O7 were prepared. Ba
x
Sr2−x
Si2O7 retained a tetragonal crystal structure similar to the structure of the other compounds up to a stoichiometry of x=1.6, which enabled a systematic study of the common structure. Monoclinic Ba2MgSi2O7 was prepared, and the luminescence properties were compared with those of other samples. The emission and excitation spectra
of tetragonal M2MgSi2O7 (M=Ca, Sr, and Ba) changed as a function of the covalency, site symmetry, and crystal field strength. The luminescence properties
showed excellent agreement with theoretical predictions based on these factors. The Stokes shift differentiated the emission
behaviors of the tetragonal and monoclinic structures. |
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Keywords: | |
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