Open AccessPhotoluminescence and features of the defective structure of nominally pure lithium niobate single crystals.
Author(s) -
M.V. Smirnov,
N. V. Sidorov,
N. А. Teplyakova,
В. Б. Пикулев
Publication year - 2020
Publication title -
trudy kolʹskogo naučnogo centra ran
Language(s) - English
Resource type - Journals
ISSN - 2307-5252
DOI - 10.37614/2307-5252.2020.3.4.037
Subject(s) - photoluminescence , materials science , lithium niobate , stoichiometry , crystallographic defect , wavelength , lithium (medication) , crystal (programming language) , absorption edge , optics , crystallography , optoelectronics , chemistry , band gap , medicine , physics , computer science , programming language , endocrinology
The photoluminescence intensity in lithium niobate crystals close to the stoichiometric composition being lower than in a congruent crystal was established. The increase of Li / Nb ratio leads to shifting the photoluminescence bands to the short-wavelength region of the spectrum and changing the fundamental absorption edge of the crystals under study. It was shown that, in addition to point defects in the cationic sublattice, complex defects due to the presence of OH groups and compensation defects (VLi / VNb) in the structure can also contribute to photoluminescence.