Photoluminescence and Electron Paramagnetic Resonance Spectroscopy for Revealing Visible Emission of ZnO Quantum Dots

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Both PL and EPR are simultaneously adopted to systematically elucidate the defect centers of green luminescence (GL) as well as the EPR peak g = 1.96 of ZnO and the relationship between them. The PL of ZnO QDs reveals that GL of 2.21-2.31 eV disappears at excitation wavelengths > 400 nm. This is related to the electronic transition from conduction band (CB), or shallow donor defect centers, to deep defects of V-Zn-H complexes at approximate to 0.9 eV above the valence band (VB). The EPR peak g = 1.96 emerged only when irradiated with light shorter than 400 nm, which is explicitly correlated with the electrons trapped in the CB or the shallow donors participating in the GL. A spin-spin relaxation time (T-2) estimated from the peak-to-peak line width Delta H-pp in the EPR signal is approximate to 17.5-52.5 ns, which is two orders of magnitude longer than known values for bulk or thin-film ZnO.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2022-05
Language
English
Article Type
Article
Citation

ANNALEN DER PHYSIK, v.534, no.5

ISSN
0003-3804
DOI
10.1002/andp.202100382
URI
http://hdl.handle.net/10203/296510
Appears in Collection
MS-Journal Papers(저널논문)
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