Features of the Defect Structure and Luminescence of Nominally Pure Lithium Niobate Crystals Produced Using Different Technologies

被引：4

作者：

Smirnov, Maxim ^{[1
]}

Manukovskaya, Diana ^{[1
]}

Sidorov, Nikolay ^{[1
]}

Palatnikov, Mikhail ^{[1
]}

机构：

[1] Fed Res Ctr Kola Sci Ctr Russian Acad Sci ICT, Tananaev Inst Chem Subdiv, Apatity 184209, Russia

来源：

MATERIALS | 2023年 / 16卷 / 01期

关键词：

lithium niobate; luminescence; defects; small radius polaron; band gap; luminescence center; UV-EXCITED LUMINESCENCE; LINBO3; LI; CENTERS; ZN; PHOTOLUMINESCENCE; PARAMETERS; DEPENDENCE; RATIO; TIME;

D O I：

10.3390/ma16010255

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We have established that luminescence in lithium niobate crystals both congruent and near-stoichiometric (R approximate to 1) is due to point defects in the cationic sublattice and intraconfigurational transitions in the oxygen-octahedral NbO6 clusters. We have also determined that the main contribution to the luminescence in the visible and near IR regions is made by luminescence centers with the participation of Nb-Li defects: the Nb-Li-Nb-Nb bipolaron pair and the Nb-Li-O defect in a congruent crystal. The minimum intensity of bipolaron luminescence has been observed in stoichiometric crystals obtained using different technologies. Weak luminescence of the Nb-Li-Nb-Nb bipolaron pair indicates a small number of Nb-Li defects in the crystal structure. The number of Nb-Li defects in the crystal structure indicates a deviation of the crystal composition from stoichiometry.

引用

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