Characteristics of ZnO:Zn phosphor thin films by post-deposition annealing

Li, Wei; Mao, Dali; Zhang, Fumin; Wang, Xi; Liu, Xianghuai; Zou, Shichang; Zhu, Yan; Li, Qiong; Xu, Jingfang

doi:10.1016/s0168-583x(00)00017-3

Cited by 47 publications

(18 citation statements)

References 12 publications

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“…Oxygen vacancies occur in three different charge states: the neutral oxygen vacancy ͑V O 0 ͒, the singly ionized oxygen vacancy ͑V O * ͒, and the doubly ionized oxygen vacancy ͑V O ** ͒ and only V O * can act as the so-called luminescent centers. 10 In this article we present size dependent fluorescence emission of colloidal solution of ZnO nanoparticles. ZnO solid has a band gap energy of 3.37 eV and therefore can be analyzed by spectroscopic methods in most of the solvents ͑like diethylene glycol, methanol, propan-2-ol, water͒ that are transparent in the whole UV-visible spectral regions.…”

Section: Introductionmentioning

confidence: 99%

Size dependent fluorescence spectroscopy of nanocolloids of ZnO

Irimpan

Nampoori

Radhakrishnan

et al. 2007

Journal of Applied Physics

178

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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: Introductionmentioning

confidence: 99%

Size dependent fluorescence spectroscopy of nanocolloids of ZnO

Irimpan

Nampoori

Radhakrishnan

et al. 2007

Journal of Applied Physics

178

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“…Vanheusden et al [24] found that oxygen vacancies are responsible for the green luminescence in ZnO. Oxygen vacancies occur in three different charge states: the neutral oxygen vacancy ( V can act as the so called luminescent center [25].…”

Section: Resultsmentioning

confidence: 99%

Intense violet–blue emission and paramagnetism of nanocrystalline Gd3+ doped ZnO ceramics

et al. 2015

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Nanocrystalline Zn 1x Gd x O (x = 0, 0.02, 0.04, 0.06, and 0.08) ceramics were synthesized by ball milling and subsequent solid-state reaction. The transmission electron microscopy (TEM) micrograph of as synthesized samples revealed the formation of crystallites with an average diameter of 60 nm, and the selected area electron diffraction (SAED) pattern confirmed the formation of wurtzite structure. A red shift in the band gap was observed with increasing Gd 3+ concentration. The photoluminescence of nanocrystalline Gd 3+ doped ZnO exhibited a strong violet-blue emission. Concentration dependence of the emission intensity of Gd 3+ in ZnO was studied, and the critical concentration was found to be 4 mol% of Gd 3+ . The Gd 3+ doped ZnO exhibited paramagnetic behavior at room temperature, and the magnetic moment increased with Gd 3+ concentration.

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“…It is also known that the oxygen vacancy could occur in three different charge states: 1) neutral oxygen vacancy; 2) singly ionized oxygen vacancy and 3) doubly ionized oxygen vacancy [14,30]. Based on g value, most of the experimental investigations of oxygen vacancies in undoped ZnO fall on two catagories [31] one set of reports associate oxygen vacancies with the g-value of 1.96, the other with g value of 1.990.…”

Section: Resultsmentioning

confidence: 99%

Characteristics and Photocatalytics Activities of Ce-Doped ZnO Nanoparticles

Djaja¹,

Saleh²

2013

MSA

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Ce-doped ZnO nanoparticles with various doping concentrations of cerium ion were prepared by the co-precipitation method. All prepared nanoparticles were characterized by electron spin resonance (ESR), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and UV-Vis diffuse reflectance spectroscopy. All nanoparticles show X-ray diffraction pattern that matched with ZnO in its wurzite structure and average grain size was in the range of 13 -16 nm. UV-Vis measurements indicated a red shift of the photophysical response of ZnO after doping that was exhibited in reflection spectra in the visible region between 300 -800 nm. In addition, it has been found from electron spin resonance measurements that defects, which are likely to be oxygen vacancy and an electron trapped at cerium site are formed in our Ce-doped ZnO particles. Photocatalytic activities of Ce-doped ZnO were evaluated by irradiating the nanoparticles solution to ultraviolet light by taking methyl orange as organic dye. The experiment demonstrated that the photodegradation increased as doping concentrations increased at first and then decreased when the doping concentration exceeded 9 at%. It is proposed that the photocatalytic activity is strongly dependent on the formation of oxygen vacancy and an electron trapped at cerium site.

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Characteristics of ZnO:Zn phosphor thin films by post-deposition annealing

Cited by 47 publications

References 12 publications

Size dependent fluorescence spectroscopy of nanocolloids of ZnO

Size dependent fluorescence spectroscopy of nanocolloids of ZnO

Intense violet–blue emission and paramagnetism of nanocrystalline Gd3+ doped ZnO ceramics

Characteristics and Photocatalytics Activities of Ce-Doped ZnO Nanoparticles

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