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Physical review. B, Condensed matter

Two-photon excitation spectroscopy of 4f7→4f7 transitions of Eu2+ ions doped in a KMgF3 crystal

Hyo Jin Seo, Byung Kee Moon, T. Tsuboi

Published Nov 15, 2000• 22 citations
Publisher

Abstract

Intraconfiguration ${4f}^{7}\ensuremath{\rightarrow}{4f}^{7}$ transitions of ${\mathrm{Eu}}^{2+}$ in ${\mathrm{KMgF}}_{3}$ have been investigated by two-photon excitation (TPE) spectroscopy at 10 K. Emission bands due to the ${}^{6}{\stackrel{\ensuremath{\rightarrow}}{{P}_{7/2}}}^{8}{S}_{7/2}$ and ${}^{6}{\stackrel{\ensuremath{\rightarrow}}{{I}_{7/2}}}^{8}{S}_{7/2}$ transitions are obtained by two-photon excitation into the ${}^{6}{I}_{J}$ $(J=7/2,9/2,17/2,11/2,15/2,13/2)$ and ${}^{6}{D}_{J}$ $(J=1/2,7/2,3/2,5/2)$ states. The TPE spectrum of the ${}^{6}{\stackrel{\ensuremath{\rightarrow}}{{I}_{7/2}}}^{8}{S}_{7/2}$ emission is observed to be different from that of the ${}^{6}{\stackrel{\ensuremath{\rightarrow}}{{P}_{7/2}}}^{8}{S}_{7/2}$ emission. This is explained by the relative positions of the lowest crystal-field component of the ${}^{6}{I}_{7/2}$ level and the lowest level of the ${4f}^{6}5d$ configuration for cubic-site and non-cubic-site ${\mathrm{Eu}}^{2+}$ ions. The observed TPE spectra are satisfactorily interpreted by a suggestion that the ${}^{6}{\stackrel{\ensuremath{\rightarrow}}{{I}_{7/2}}}^{8}{S}_{7/2}$ emission is produced by only cubic-site ${\mathrm{Eu}}^{2+},$ while the ${}^{6}{\stackrel{\ensuremath{\rightarrow}}{{P}_{7/2}}}^{8}{S}_{7/2}$ emission is produced by both cubic-site ${\mathrm{Eu}}^{2+}$ and non-cubic-site ${\mathrm{Eu}}^{2+}.$

DOI
10.1103/physrevb.62.12688

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We excite the (4f2)1s0 state directly through a two photon excited state absorption (from the 1D2 level) and indirectly through excitation of the 4f5d band (using an ArF excimer laser). In Pr3+:LaF3 the 1S0 state lies below the band, and only 1S0 emission is observed. In most hosts examined, it is above the band, and only 4f5d emission is observed. In Pr3+:CaF2 there are sites with each of these properties, and both 1S0 and 4f5d emission are observed, with a relative strength that is concentration dependent.