ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Site-selective luminescence spectroscopy of the 4f2−4f5d(fd) transition is reported for six different Pr3+ sites in CaF2:Pr3+. In addition to the naturally occurring distantly charge-compensated cubic site and the locally charge-compensated Pr3+–F− site, charge compensating ions (H−, D−, Li+, and Na+) were added to create four other types of sites. In the fd luminescence spectra fine structure (zero-phonon lines and vibronic lines) is observed. The positions of zero-phonon lines and vibrational frequencies vary for these different Pr3+ sites. For the H− and D− charge-compensated site the lowest 4f5d level is shifted to some 3000 cm−1 lower energy compared to the cubic site. This is attributed to a higher degree of covalency and a larger crystal-field splitting. Contrary to previous results for Ce3+–H− and Ce3+–D−, only a small (close to zero) isotope shift is observed. In the fd emission spectra, the 4f5d–1I6, 3PJ transitions are used to reveal marked differences between sites which allows their identification. © 2001 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1414319
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