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Symmetries of Luminescent Centers in NaCl:Pb 2+ Excited in the A‐Absorption Band
Author(s) -
Benci S.,
Fermi F.,
Reverberi R.
Publication year - 1982
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.2221090213
Subject(s) - luminescence , tetragonal crystal system , excited state , impurity , absorption band , vacancy defect , trigonal crystal system , absorption (acoustics) , atomic physics , materials science , chemistry , crystallography , physics , crystal structure , optics , optoelectronics , organic chemistry
Polarized luminescence measurements are used to study the luminescent characteristics of NaCl:Pb 2+ excited into the A‐absorption band. For the E 1 = 4.01 eV emission it is found that the luminescent centers have tetragonal and trigonal symmetries due to the Jahn‐Teller effect that allows the coexistence of tetragonal and trigonal minima on the 3 T 1u APES while the E 2 = 3.29 eV emission band is due to aggregates of impurities in the {111} planes with trigonal symmetry. The charge compensating vacancy associated to the impurity gives a meaningless effect on the luminescence polarization and its position cannot be ascertained.