Luminescence properties of Eu2+in M2MgSi2O7(M=Ca, Sr, and Ba) phosphors

Author:

T. Kim   Y. Kim   S. Kang  

Journal:

Applied Physics B: Lasers and Optics

Issue Date:

2012

Abstract(summary):

The photoluminescence properties of alkali-earth magnesium silicates (M 2MgSi 2O 7, M=Ca, Sr, and Ba) doped with Eu 2+ were investigated. Solid solutionsof Ba xSr 2-xSi 2O 7, Ca 2MgSi 2O 7, and Sr 2MgSi 2O 7 were prepared. Ba xSr 2-xSi 2O 7 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 Ba 2MgSi 2O 7 was prepared, and the luminescence properties were compared with those of other samples. The emission and excitation spectra of tetragonal M 2MgSi 2O 7 (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.

Page:

1009-1013