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Analysis of spectra of neat and lanthanide ion‐doped KPb 2 Cl 5 excited by synchrotron radiation
Author(s) -
Tanner Peter A.,
Jia Guohua,
Cheng BingMing,
Brik Mikhail G.
Publication year - 2012
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201147336
Subject(s) - lanthanide , synchrotron radiation , excited state , ion , excitation , spectral line , atomic physics , chemistry , doping , synchrotron , emission spectrum , analytical chemistry (journal) , materials science , physics , optics , optoelectronics , organic chemistry , quantum mechanics , astronomy , chromatography
The excitation and emission spectra of neat K 2 PbCl 5 , and also doped with the lanthanide ions Pr 3+ , Nd 3+ , Er 3+ and Tm 3+ have been recorded at temperatures down to 10 K using synchrotron radiation. To facilitate the spectral assignments, a first principles calculation has been performed and despite its inaccuracies it confirms the nature of the lower energy levels of this system. The lowest energy transitions in the excitation spectrum are Pb 2+ ‐centred, whereas the band gap transitions, which are essentially of a charge transfer (CT) nature, are at shorter wavelengths. The emission transitions are likewise assigned to those from the Pb 2+ 3 P 1,0 states, and from the band gap. The Stokes shift of the latter transition is ∼18 000 cm −1 . Under synchrotron radiation excitation, the energy transfer from the host or Pb 2+ levels to 4f N lanthanide ion levels is not efficient.