Pressure effect on emission spectra and crystal field for La OBr : Eu

Abstract
The emission spectra for LaOBr : Eu were measured at pressures up to 13 GPa and room temperature. The pressure dependences of levels of 7F0,1,2,3,4 and 5D0,1,2 are given. The crystal field parameters Bk q were computed by fitting the experimental levels. The strength of crystal field decreases with increasing pressure. A brief discussion on the observed phenomena is presented.

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