Indian Journal of Pure and Applied Physics

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Orange Photoluminescence from Hydrothermally Grown Zno Nanorods and Study on its Defects


Affiliations
1 Vignan’s Foundation for Science Technology and Research (Deemed to be) University, Vadlamudi, Andhra Pradesh, India
2 Departamento de Física and CeFEMA, InstituteSuperior Técnico, P-1049-001 Lisboa,
3 Department of Chemical Engineering and CQE, Institute Superior Técnico, P-1049-001 Lisboa,
4 Department of Physics, PACE Institue of Technology & Sciences, Ongole, Andhra Pradesh, 523 272, India
5 Department of Physics, RGUKT Basar, Nirmal, Telangana 504107, India

The visible photoluminescence (PL) of ZnO is controversial for a long time. At present, the contribution of oxygen interstitial defects to yellow/orange emission from ZnO nanostructures is on debate. In this report, the origin of orange emission from solution- grown ZnO nanorods is investigated using excitation wavelength dependent photoluminescence PL, PL excitation and UV-Vis spectra. These results showed that orange emission may be due to the transition of an electron from shallow defect levels positioned slightly below the conduction band to the singly ionized oxygen vacancies. Hence, it is believed that oxygen interstitials may not be responsible for orange emission from solution grown ZnO nanostructures.
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  • Orange Photoluminescence from Hydrothermally Grown Zno Nanorods and Study on its Defects

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Authors

kotikala SowriBabu
Vignan’s Foundation for Science Technology and Research (Deemed to be) University, Vadlamudi, Andhra Pradesh, India
P Sanguino
Departamento de Física and CeFEMA, InstituteSuperior Técnico, P-1049-001 Lisboa,
Reinhard Schwarz
Departamento de Física and CeFEMA, InstituteSuperior Técnico, P-1049-001 Lisboa,
Luis Santos
Department of Chemical Engineering and CQE, Institute Superior Técnico, P-1049-001 Lisboa,
S Alves
Department of Chemical Engineering and CQE, Institute Superior Técnico, P-1049-001 Lisboa,
V Himamaheswara Rao
Department of Physics, PACE Institue of Technology & Sciences, Ongole, Andhra Pradesh, 523 272, India
J.N. Kiran
Vignan’s Foundation for Science Technology and Research (Deemed to be) University, Vadlamudi, Andhra Pradesh, India
Ch Sujatha
Department of Physics, RGUKT Basar, Nirmal, Telangana 504107, India
A Fedorov
Department of Chemical Engineering and CQE, Institute Superior Técnico, P-1049-001 Lisboa,

Abstract


The visible photoluminescence (PL) of ZnO is controversial for a long time. At present, the contribution of oxygen interstitial defects to yellow/orange emission from ZnO nanostructures is on debate. In this report, the origin of orange emission from solution- grown ZnO nanorods is investigated using excitation wavelength dependent photoluminescence PL, PL excitation and UV-Vis spectra. These results showed that orange emission may be due to the transition of an electron from shallow defect levels positioned slightly below the conduction band to the singly ionized oxygen vacancies. Hence, it is believed that oxygen interstitials may not be responsible for orange emission from solution grown ZnO nanostructures.