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Origin of green luminescence in hydrothermally grown ZnO single crystals
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SYSNO ASEP 0449051 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Origin of green luminescence in hydrothermally grown ZnO single crystals Author(s) Čížek, J. (CZ)
Valenta, J. (CZ)
Hruška, P. (CZ)
Melikhova, O. (CZ)
Procházka, I. (CZ)
Novotný, Michal (FZU-D) RID, ORCID, SAI
Bulíř, Jiří (FZU-D) RID, ORCID, SAISource Title Applied Physics Letters. - : AIP Publishing - ISSN 0003-6951
Roč. 106, č. 25 (2015), "251902-1"-"251902-4"Number of pages 4 s. Language eng - English Country US - United States Keywords defects ; dependence ; acceptor ; vacancy Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GAP108/11/0958 GA ČR - Czech Science Foundation (CSF) Institutional support FZU-D - RVO:68378271 UT WOS 000357036600012 EID SCOPUS 84934999451 DOI 10.1063/1.4922944 Annotation Combining photoluminescence and positron annihilation studies of hydrothermally grown ZnO crystals with stoichiometry varied by controlled annealing enabled us to clarify the origin of green luminescence. It was found that green luminescence in ZnO has multiple origins and consists of a band at 2.3(1) eV due to recombination of electrons of the conduction band by zinc vacancy acceptors coupled with hydrogen and a band at 2.47(2) eV related to oxygen vacancies. The as-grown ZnO crystals contain zinc vacancies associated with hydrogen and exhibit a green luminescence at 2.3(1) eV. Annealing in Zn vapor removed zinc vacancies and introduced oxygen vacancies. This led to disappearance of the green luminescence band at 2.3(1) eV and appearance of a green emission at higher energy of 2.47(2) eV. Moreover, the color of the crystal was changed from colorless to dark red. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2016
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