Low Temperature Physics: 43, 520 (2017); https://doi.org/10.1063/1.4984293
Fizika Nizkikh Temperatur: Volume 43, Number 4 (April 2017), p. 649-656    ( to contents , go back )

Charge transfer transitions in optical spectra of NicMg1–cO oxides

V.N. Churmanov2, V.I. Sokolov1, V.A. Pustovarov2, N.B. Gruzdev1, M.A. Uimin1, I.V. Byzov1, A.V. Druzhinin1, A.V. Korolyov1

G.A. Kim3, A.F. Zatsepin2, and J.A. Kuznetsova2

1Федеральное государственное бюджетное учреждение науки Институт физики металлов им. М.Н. Михеева Уральского отделения РАН, ул. С. Ковалевской, 18, г. Екатеринбург, 620990, Россия
E-mail: sokolovvi@gmail.com; visokolov@imp.uran.ru

2Уральский федеральный университет, ул. Мира, 19, г. Екатеринбург, 620002, Россия

3Институт органического синтеза Уральского отделения РАН ул. С. Ковалевской, 20, г. Екатеринбург, 620990, Россия
pos Анотація:

Received December 19, 2016

Abstract

In NicMg1–cO (с = 0.008) oxides the radiating re-combination with charge transfer was observed in temperature region of 8300 К. This recombination arises due to strong hybridization of 3d-states of Ni2+ ion and band states. In spectrum of excitation of charge transfer radiation the LO vibrational repetitions of two lines of charge transfer exciton were registered with energy interval approximately 25 meV. In absorption spectrum of NiO nanocrystals two weak peaks at the energies of 3.510 and 3.543 eV were discovered; these peaks are in strong dependence from the temperature. These peaks are interpreted as charge transfer excitons on the edge of NiO fundamental absorption. The distance between the lines of charge transfer excitons in NicMg1–cO oxide spectra is caused by spin-orbit splitting of the valence band top, which is formed by p-states of oxygen ions.

PACS: 78.40.–q Absorption and reflection spectra: visible an ultraviolet;
PACS: 78.55.–m Photoluminescence, properties and materials.

Key words: photoluminescence, optical absorption, NiO, MgO, charge transfer transitions, excitons.

Published online: February 24, 2017

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