Premium
Luminescence of Ph 2+ and Bi 3+ Centres in Alkali‐Earth Sulphides and Oxides
Author(s) -
Ellervee A. F.
Publication year - 1977
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.2220820107
Subject(s) - excited state , atomic physics , atomic electron transition , ion , luminescence , molecular electronic transition , alkaline earth metal , impurity , alkali metal , spectral line , electron configuration , emission spectrum , electron , chemistry , ground state , physics , optoelectronics , organic chemistry , quantum mechanics , astronomy
Luminescence centres connected with Bi 3+ and Pb z+ ions are investigated in CaO, SrO, CaS, and SrS crystals at 5 to 300 K. It is found that the ground state and the two lowest excited states of the Bi 3+ as well as the Pb 2+ centres correspond to the energy levels of the free impurity ions and have A 1g , 3 A 1U , and 3 T 1u , symmetries, respectively. Emission is observed which is caused by electronic transitions from both the excited states. The 3 A 1u , → A lg transition becomes slightly allowed due to the interaction of an electron with the vibrations of T 1u , symmetry. The anti‐Stokes and zero‐phonon lines are observed in the vibronic structure of spectra. The main series of lines are caused by the interaction of electrons with the totally symmetric A lg , vibrations. In the emission spectra of CaS: Bi and SrS: Bi electronic transitions in the host lattice perturbed by impurities are also evident besides intra‐centre electronic transitions.