TY - JOUR
T1 - Excitation and emission spectra of Cs2NaLnCl6 crystals using synchrotron radiation
AU - Tanner, Peter A.
AU - Duan, Chang-Kui
AU - Cheng, Bing-Ming
PY - 2010
Y1 - 2010
N2 - The visible emission and vacuum ultraviolet excitation spectra of the series Cs2NaLnCl6 (Ln=Y, Nd, Sm, Eu, Tb, Er, Yb) and Cs2NaYCl6:Ln3+ (Ln = Sm, Er) have been recorded using synchrotron radiation at room temperature, and in some cases at 10K. The excitation spectra comprise features associated with charge transfer, excitation from the valence to conduction band, and impurity bands. No d-f emissions were observed for these Ln3+ ions, so that the emission bands comprise intraconfigurational 4fN-4fN transitions and impurity bands, whose natures are discussed. Theoretical simulations of the f-d absorption spectra have been included. The comparison with data from the synchrotron at Desy enables a comprehensive account of the ground (or vibrationally excited ground for Ln2+) states of the Ln3+ 4fN, Ln3+ 4fN-15d, and Ln2+ 4fN+1 configurations relative to the valence and conduction bands of Cs2NaLnCl6, for which the band gaps are between 6.6 and 8.1eV. © Taylor & Francis Group, LLC.
AB - The visible emission and vacuum ultraviolet excitation spectra of the series Cs2NaLnCl6 (Ln=Y, Nd, Sm, Eu, Tb, Er, Yb) and Cs2NaYCl6:Ln3+ (Ln = Sm, Er) have been recorded using synchrotron radiation at room temperature, and in some cases at 10K. The excitation spectra comprise features associated with charge transfer, excitation from the valence to conduction band, and impurity bands. No d-f emissions were observed for these Ln3+ ions, so that the emission bands comprise intraconfigurational 4fN-4fN transitions and impurity bands, whose natures are discussed. Theoretical simulations of the f-d absorption spectra have been included. The comparison with data from the synchrotron at Desy enables a comprehensive account of the ground (or vibrationally excited ground for Ln2+) states of the Ln3+ 4fN, Ln3+ 4fN-15d, and Ln2+ 4fN+1 configurations relative to the valence and conduction bands of Cs2NaLnCl6, for which the band gaps are between 6.6 and 8.1eV. © Taylor & Francis Group, LLC.
KW - 4f-5d spectra
KW - Charge transfer
KW - Energy levels
KW - Excitation spectra
KW - Lanthanide ion
KW - Spectral intensities
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U2 - 10.1080/00387010.2010.505856
DO - 10.1080/00387010.2010.505856
M3 - RGC 21 - Publication in refereed journal
SN - 0038-7010
VL - 43
SP - 431
EP - 445
JO - Spectroscopy Letters
JF - Spectroscopy Letters
IS - 5
ER -