KIM HONG HEE Lee, Heebin Jeung Ku Kang CHOI, WON KOOK 2024-01-12T03:31:20Z 2024-01-12T03:31:20Z 2022-03-02 2022-05 0003-3804 https://pubs.kist.re.kr/handle/201004/76739 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. English A H？thig Photoluminescence and Electron Paramagnetic Resonance Spectroscopy for Revealing Visible Emission of ZnO Quantum Dots Article 10.1002/andp.202100382 1 Annalen der Physik (Leipzig), v.534, no.5, pp.2100382 - 2100393 Annalen der Physik (Leipzig) 534 5 2100382 2100393 Y scie scopus 000762811800001 2-s2.0-85125462559 Physics, Multidisciplinary Physics Article ZINC-OXIDE MAGNETIC-RESONANCE POINT-DEFECTS NANOPARTICLES CONFINEMENT EXCITON OXYGEN SIZE BAND ESR ZnO quantum dots zinc vacancy-hydrogen complexes electron paramagnetic resonance oxygen vacancies photoluminescence