2013 Volume 108 Issue 2 Pages 47-54
Minerals are the source of rare earth elements (REE), and knowledge of the amount of REE in different minerals is necessary for a mineralogist. We propose steady-state luminescence measurement as a quick and non-destructive method for detecting several lanthanide ions present together in the same sample. By using excitation and emission spectra of each 4f ion, rare earth ions could be easily identified. The most intense emission lines in the UV-VIS range are 336 nm for Ce3+, 420 nm for Eu2+, 596-649 nm for Pr3+ and Sm3+, 614-617 nm for Eu3+, at 478 and 573-579 nm for Dy3+, and 520-550 nm for Er3+ and Ho3+ ions. We have verified that the best excitation wavelength for each ion as follows: for Ce3+ and Eu2+, 295 nm and 336 nm; for Pr3+, 442 nm; for Sm3+, 399-408 nm; for Eu3+, 393-395 nm; for Dy3+, 348 nm; for Er3+, 377 nm; and for Ho3+, 415 nm.