OPTICAL-ABSORPTION AND EMISSION-SPECTRA OF TB-3+ IN HEXAGONAL CRYSTALS OF NA3[TB(PYRIDINE-2,6-DICARBOXYLATE)3].NACLO4.10H2O

We have measured and analyzed the polarized orthoaxial luminescence and absorption spectra of Tb3+ and Eu3+ in single crystals of trigonal Na3[Ln(dpa)3] . NaClO4 . 10H2O (dpa = 2,6-pyridinedicarboxylate, the dianion of dipicolinic acid). Differential linear polarization (sigma vs. pi) is measured in the orthoaxial luminescence and absorption spectra. A semiempirically derived energy level scheme is developed for the crystal field components of the Tb3+ (F-7(J) (J = 0-6), 5D4, 5D3, 5G6, 5L10, 5D2, 5G5) and the Eu3+ (F-7(J) (J = 0-6), 5D(J) (J = 0-3)) multiplets.