2008年6月1日 · A broad emission band peaking near 700 nm in the irradiated crystal is assigned to donor–acceptor pair recombination involving zinc-vacancy acceptors. EPR spectra from Fe 3+ ions and singly ionized nonaxial zinc vacancies are observed at 30 K after the irradiation, but before illumination.

2008年2月25日 · Electron paramagnetic resonance (EPR) has been used to monitor oxygen vacancies and zinc vacancies in a ZnO crystal irradiated near room temperature with 1.5 MeV electrons. Out-of-phase detection at 30 K greatly enhances …

2012年9月13日 · Oxygen vacancies of zinc oxide were followed by photoluminescence (PL) and electron paramagnetic resonance (EPR) spectroscopies. The green PL emission was associated with oxygen vacancies: its intensity is enhanced upon static thermal treatment under inert or under vacuum, whereas it decreases upon oxygen treatment.

2011年10月15日 · In this paper, we report for first time the thermo luminescent properties of ZnO nanopowders irradiated by γ-rays. We have also examined the intrinsic defects in ZnO like zinc or oxygen vacancies present in this material using Electron paramagnetic resonance (EPR) spectroscopy and the results are discussed in detail.

2023年4月1日 · In this work, different transition metal ions (Mn, Fe, and Cu) were doped into ZnO nanocrystals. The current study presents a detailed multi-frequency (X- and Q-band) EPR investigation that clarifies the localization of the dopant ion, its site symmetry, and the formation of intrinsic-extrinsic defect complexes in ZnO:TM.

2010年5月23日 · Several EPR spectra attributed to intrinsic defects were found after irradiation of ZnO with high-energy electrons, neutrons, or protons. In the EPR experiments with electron-irradiated ZnO, Locker and Meese [7, 8] found two displacement thresholds at 310 and 900 keV associated with oxygen and zinc displacements, respectively.

Electron paramagnetic resonance (EPR) spectroscopy is a very powerful sensitive technique used for the characterization of nature of magnetic impurities/defects and spin dynamics in materials that have paramagnetic defects [21 – 36] in nanocrystalline zinc oxide. EPR spectra are scanned by varying the magnetic field at constant microwave ...

摘要 采用种子化学气相传输法生长的ZnO晶体在室温附近用1.5 MeV电子辐照。使用光吸收、光致发光 (PL) 和电子顺磁共振 (EPR) 表征所得的氧和锌空位。在 409 nm 附近达到峰值的宽吸收带使照射的晶体呈黄色，并被分配给中性氧空位。

2020年10月15日 · The magnetic and electronic properties of the hydrogenated highly conductive zinc oxide (ZnO) microparticles were investigated by electron paramagnetic resonance (EPR) and contactless microwave...

2022年3月2日 · Based on numerous EPR observations of ZnO, the g = ≈1.99–2.0 line is predominantly and consistently assigned to V O. Furthermore, more convincing evidence for the EPR signal as V O + was revealed by the observation of hyperfine interaction with the Zn neighbors of the vacancy, whereas no hyperfine interactions were observed for the g of ≈ ...