ELECTRONIC ENERGY-LEVEL STRUCTURE AND CORRELATION CRYSTAL-FIELD EFFECTS OF ER3+ IN CS3LU2BR9

Single crystals of Cs3Lu2Br9:1% Er 3+ were grown using the Bridgman technique. From highly resolved polarized absorption and luminescence measurements at 15 and 4.2 K, respectively, 101 crystal-field levels from 27 different 2S + 1L J(4f11) multiplets of Er3+ in C3v symmetry were assigned. A Hamiltonian including 16 atomic and 6 crystal-field parameters was fitted to a set of 87 crystal-field levels and gave a rms standard deviation of 23.84 cm-1. Inclusion of one freely varying correlation crystal-field (CCF) parameter lowered the overall rms standard deviation to 19.25 cm-1 and provided a dramatic improvement of the calculated crystal-field splittings of specific CCF-sensitive J multiplets. © 1994 American Institute of Physics.