Dependence of the emission electric dipole line strength of Eu3+ on the composition of lead borate glasses

Lead borate glasses xB2O3+(99–x)PbO+0.5Eu2O3 (x=70, 60, …, 10) were prepared by melt-quenching method. The luminescent properties were characterized with excitation and emission spectra. The emission intensities for 5D0-7FJ (J=0–4) were analyzed to give variation of the relative electric dipole line strengths with the composition of glasses so as to examine the crucial implicit assumption of independent electric dipole line strength on the composition of glass in the Phys. Rev. Lett. 2003, 91, 203903 paper studying local-field effect.