The electronic structure and spectral properties of ZnO and its defects

Xu, Ping; Sun, Yuming; Shi, Chaoshu; Xu, F.; Pan, Haibin

doi:10.1016/s0168-583x(02)01425-8

Cited by 416 publications

(228 citation statements)

References 9 publications

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“…26 Recently, Djurisic et al 12,27 found that there is no simple relationship between the intensity of g ϳ 1.96 EPR signal and the visible PL; the green PL is observed for the samples which do not show EPR line at g ϳ 1.96, and they conclude that the most likely explanation for the green luminescence involves multiple defects and/or defect complexes and the major part of the visible emission originates from the centers at the nanostructures surface. Xu et al 28 calculated the levels of various defects including complex defects V O :Zn i and V Zn :Zn i . They found no states within the gap from V Zn :Zn i , whereas for V O :Zn i two levels 1.2 and 2.4 eV above the valence band were found, so this type of defect represents a possible candidate for green emission in ZnO.…”

Section: -4mentioning

confidence: 99%

Size dependent fluorescence spectroscopy of nanocolloids of ZnO

Irimpan

Nampoori

Radhakrishnan

et al. 2007

Journal of Applied Physics

179

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Intra-excitonic relaxation dynamics in ZnO Appl. Phys. Lett. 99, 231910 (2011) Thermal diffusion of nitrogen into ZnO film deposited on InN/sapphire substrate by metal organic chemical vapor deposition J. Appl. Phys. 110, 113509 (2011) Manifestation of spin-spin interaction between oxygen vacancy and magnesium in ZnMgO nanorods by electron paramagnetic resonance studies Appl. Phys. Lett. 99, 194101 (2011) Selective pair luminescence in the 1.4-eV band of CdTe:In J. Appl. Phys. 110, 093103 (2011) Evidence of cation vacancy induced room temperature ferromagnetism in Li-N codoped ZnO thin films Appl. Phys. Lett. 99, 182503 (2011) Additional information on J. Appl. Phys. In this article we present size dependent spectroscopic observations of nanocolloids of ZnO. ZnO is reported to show two emission bands, an ultraviolet ͑UV͒ emission band and another in the green region. Apart from the known band gap 380 nm and impurity 530 nm emissions, we have found some peculiar features in the fluorescence spectra that are consistent with the nanoparticle size distribution. Results show that additional emissions at 420 and 490 nm are developed with particle size. The origin of the visible band emission is discussed. The mechanism of the luminescence suggests that UV luminescence of ZnO colloid is related to the transition from conduction band edge to valence band, and visible luminescence is caused by the transition from deep donor level to valence band due to oxygen vacancies and by the transition from conduction band to deep acceptor level due to impurities and defect states. A correlation analysis between the particle size and spectroscopic observations is also discussed.

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Section: -4mentioning

confidence: 99%

Size dependent fluorescence spectroscopy of nanocolloids of ZnO

Irimpan

Nampoori

Radhakrishnan

et al. 2007

Journal of Applied Physics

179

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“…al. [8] by using local DOI: 10.9790/5736-1002016064 www.iosrjournals.org 63 |Page density approximation in density functional theory for ZnO system. The probable defects, here can be interstitial Zn or O (Zn i or O i ), zinc vacancy (V zn ) or the oxygen antisite (O Zn ).…”

Section: Photoluminescence Resultsmentioning

confidence: 99%

Optical and Morphological Studies of Ga Doped Zno Nanocrystals

George¹

2017

IOSR JAC

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“…Therefore, the low point defect concentration in material is essential to increase the internal quantum efficiency of the near-band-edge emission. Using full-potential linear muffin-tin orbital method [18][19][20][21], energy level of various defect centres (i.e. vacancies of oxygen and zinc, antisite oxygen, interstitial zinc and oxygen) of ZnO film was calculated.…”

Section: Resultsmentioning

confidence: 99%

Optical emission and absorption spectra of Zn–ZnO core-shell nanostructures

Ghosh

Choudhary

2010

Journal of Experimental Nanoscience

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The core-shell Zn-ZnO nanostructures were fabricated from Zn-powder embedded in graphite (i.e. carbon matrix) in a thin-films form by an inexpensive vacuum arc technique followed by laser ablation. The grazing incidence X-ray diffraction pattern shows that intensity of Zn-peak decreases, and subtle ZnOpeak increasing with the increase in laser power. The high resolution transmission electron microscopic study clearly exhibits the formation of a core-shell nanostructure as fabricated by laser ablation. The emission characteristics of laser ablated (with different powers) samples show a strong exciton peak at 388 nm, and a few more weak peaks (due to weak defect states in the visible range). The optical absorption spectra were obtained from the excitonic peaks (from 344 nm to 317 nm) on decreasing laser power. These peaks occur due to the coupling of exciton absorption (from ZnO shell layer) and core metal interband absorption. The Zn-ZnO core-shell nanostructure is useful for nanophotonic applications.

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The electronic structure and spectral properties of ZnO and its defects

Cited by 416 publications

References 9 publications

Size dependent fluorescence spectroscopy of nanocolloids of ZnO

Size dependent fluorescence spectroscopy of nanocolloids of ZnO

Optical and Morphological Studies of Ga Doped Zno Nanocrystals

Optical emission and absorption spectra of Zn–ZnO core-shell nanostructures

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