Abstract
Four new ternary compounds with compositions Li 6Nd(BO 3) 3, Na 3Nd(BO 3) 2, and Na 18Nd(BO 3) 7 have been found in the M 2ONd 2O 3B 2O 3 systems, where M is either Li or Na. Concentration quenching of the neodymium emission in homologous lanthanum or gadolinium borates has been investigated. While in the Li 6Gd(BO 3) 3, Na 3La 2(BO 3) 3, and Na 3La(BO 3) 2 host lattices the quenching rate shows a quadratic dependence on Nd 3+ concentration, as expected since the coordination polyhedra are connected by common faces or edges, in Na 18La(BO 3) 7 the luminescent lifetime is not influenced by neodymium concentration. Lifetimes and crystal field splitting of the J levels are compared to those of other oxide host lattices.
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