Premium
On the Interpretation of Luminescence of Lead Halide Crystals
Author(s) -
Babin V.,
Krasnikov A.,
Nikl M.,
Stolovits A.,
Zazubovich S.
Publication year - 2002
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 - 10.1002/1521-3951(200202)229:3<1295::aid-pssb1295>3.0.co;2-a
Subject(s) - luminescence , exciton , excited state , halide , quantum tunnelling , atomic physics , ion , ionic bonding , emission spectrum , excitation , electron , radiative transfer , chemistry , ultraviolet , spectral line , materials science , physics , condensed matter physics , inorganic chemistry , optoelectronics , optics , organic chemistry , quantum mechanics , astronomy
Emission and excitation spectra, and the luminescence decay kinetics have been studied for PbCl 2 crystals at the temperatures 0.45–100 K. It has been found that even at the lowest temperatures, where the non‐radiative decay of exciton states in PbCl 2 does not take place, the decay times of both the ultraviolet (UV) and the blue (B) exciton emission are by a few orders of magnitude shorter than the decay times of the emission arising from the triplet relaxed excited state of Pb 2+ centres in lead‐doped ionic crystals. A conclusion has been drawn that the luminescence of lead halides cannot be connected with single Pb 2+ ions. It is proposed that the radiative decay of the self‐trapped excitons of the type of {(Pb 2 ) 3+ + hole} is responsible for the UV and the B emission of PbCl 2 crystals, while the lowest‐energy (BG) emission arises from the tunnelling recombinations between the (Pb 2 ) 3+ ‐type self‐trapped electrons and V K ‐type self‐trapped holes.