MEASUREMENT AND ANALYSIS OF EXCITED-STATE DECAY KINETICS AND CHIROPTICAL ACTIVITY IN THE H-6(J)[-4G5/2 TRANSITIONS OF SM3+ IN TRIGONAL NA3[SM(C4H4O5)3].2NACLO4.6H2O

Axial total luminescence (TL) and circularly polarized luminescence spectra are presented for the H-6J (J = 5/2, 7/2, 9/2 <--4G5/2 transition regions of Na3[Sm(oxydiacetate)3].2NaClO4.6H2O (SmODA) for sample temperatures of 77 K and room temperature (approximately 300 K). TL and CPL data are rationalized in terms of dipole strengths and rotatory strengths of transitions between the individual crystal-field levels of Sm3+. The calculation of dipole- and rotatory strengths was accomplished using crystal-field wave functions and electric-dipole intensity parameters determined in previous studies of the polarized absorption spectra of Sm3+ in SmODA. Calculated dipole strengths and rotatory strengths for crystal-field transitions in the H-6J(J = 5/2, 7/2, 9/2) <-- 4G5/2 regions are given. Simulated TL/CPL spectra are generated from calculated dipole- and rotatory strengths, and are compared to observed data. Excellent agreement is found between theory and observation. Non-radiative deactivation of 4G5/2 emission in SmODA and 5D0 emission in EuODA is investigated. It is shown that two vibrational modes are active in non-radiative deactivation from these states: the C-H stretching mode of the oxydiacetate ligand; and the O-H stretching mode of lattice waters. Multiphonon emission due to interaction with both vibrational modes is analyzed in terms of the modified energy-gap law of Van Dijk and Schuurmans. It is found that both modes couple with near-equal strengths to the lanthanide ion. It is suggested that the processes promoting the multiphonon transitions may have different efficiencies for the two active vibrational modes in these systems.