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Localized Exciton States of Doped Naphthalene Crystals
Author(s) -
Ostapenko N. I.,
Shpak M. T.
Publication year - 1969
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.19690360213
Subject(s) - exciton , luminescence , polarization (electrochemistry) , doping , spectral line , crystal (programming language) , absorption spectroscopy , chemistry , molecular physics , impurity , naphthalene , materials science , condensed matter physics , physics , optics , optoelectronics , organic chemistry , astronomy , computer science , programming language
Bands due to localized exciton states in a crystal arising near guest molecules have been obtained and studied in the absorption and luminescence spectra of a naphthalene crystal ( T = 4.2 °K) doped with heterocyclic compounds (thionaphthene, i = T, indole, i = I, and benzofurane, i = B). The luminescence spectrum of these states is similar to the exciton luminescence spectrum of naphthalene: the polarization ratio P i ( b/a ) for 0‐0 bands in the luminescence and absorption spectra decreases with 0‐0 bands approaching to the a ‐component of the Davydov doublet. Simultaneously depolarization of the A 1 ‐band occurs. From comparison between the polarization ratios for 0‐0 bands of the localized and impurity states (the case of isotopic mixtures) their common features as well as differences are found the latter being apparently due to the localized centre structure. The results are qualitatively explained on the basis of the theory of localized exciton states.