Tunable Visible Photoluminescence from ZnO Thin Films Through Mg‐Doping and Annealing.

Fujihara, Shinobu; Ogawa, Yoshihide; Kasai, Akira

doi:10.1002/chin.200440012

Cited by 9 publications

(12 citation statements)

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“…The visible PL emission (PL VIS ) with a wide FWHM is observed in the pure ZnO thin film. Similar results have been reported and shown this PL VIS is from the contribution of the native defects in ZnO, which can be efficiently controlled by various post-annealing methods [15,16]. Hence, the increased PL VIS in sample FA-1000 can be mainly inferred from the higher native defect density in ZnO matrix since it has a smaller crystalline size than that in pure ZnO thin film.…”

Section: Resultssupporting

confidence: 84%

“…Hence, the increased PL VIS in sample FA-1000 can be mainly inferred from the higher native defect density in ZnO matrix since it has a smaller crystalline size than that in pure ZnO thin film. In addition to the increased PL VIS , the PL spectrum accompanies increased near-infrared emission (PL NIR ) and an unusual peak (PL unusual ) located at 685 nm (1.81 eV), which have not been reported in pure or doped ZnO materials [15,16], for sample FA-1000. This PL unusual may be contributed from the nc-Si QDs embedded in the ZnO matrix with wide bandgap.…”

Section: Resultsmentioning

confidence: 84%

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Optical properties and sub-bandgap formation of nano-crystalline Si quantum dots embedded ZnO thin film

et al. 2012

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In this study, we fabricate ZnO thin films with nano-crystalline Si (nc-Si) quantum dots (QDs) using a ZnO/Si multilayer deposition structure and a post-annealing process, and the formation of high crystallinity of Si QDs embedded in the crystalline ZnO matrix is demonstrated. For optical properties, the essential features of ZnO material, high transmission in long-wavelength and high absorption in short-wavelength ranges, are preserved. We observe significantly enhanced light absorption and an unusual photoluminescence emission peak contributed from the nc-Si QDs in the middle-wavelength range. In addition, we confirm the formation of optical sub-bandgap and the obtained value is quite close to the unusual PL emission peak. We show that meaningful sub-bandgap can form in ZnO thin film by embedding nc-Si QDs while maintaining the advantageous properties of ZnO matrix. This newly developed composite material, nc-Si QD embedded ZnO thin films, can be useful for various electro-optical applications.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 84%

Optical properties and sub-bandgap formation of nano-crystalline Si quantum dots embedded ZnO thin film

et al. 2012

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“…However, after annealing, the yellow emission is improved with a blue shift towards a wavelength of 594 nm. Fujihara et al [47] and Chen et al [48] have also reported a blue shift in their studies.…”

Section: Photoluminescence Studies Of Filmsmentioning

confidence: 81%

Influence of Annealing on Properties of Spray Deposited ZnO Thin Films

Nadarajah

Chee

Tan

2013

Journal of Nanomaterials

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Zinc Oxide (ZnO) thin films were deposited on glass substrates via the spray pyrolysis technique. The films were subsequently annealed in ambient air from 300°C to 500°C. The morphology and structural properties of the thin films were studied by field emission scanning electron microscope (FESEM), atomic force microscopy (AFM), and X-ray diffractometry (XRD) techniques. Electrical resistivity of the thin films was measured using a data acquisition unit. The optical properties of the films were characterized by UV-vis spectroscopy and photoluminescence (PL) technique. X-ray diffraction data showed that the films were grown in the (002) direction with a hexagonal wurtzite structure. The average grain size ranged from 15 to 27 nm. Increasing annealing temperatures resulted in larger grain sizes and higher crystallinity, with the surface roughness of annealed films being more than twice if compared to unannealed film. The electrical resistivity of the films decreased with the increasing annealing temperature. The UV and visible band emissions were observed in the photoluminescence spectra, due to exciton and defect-related emissions, respectively. The transmission values of the films were as high as 90% within the visible range (400–700 nm).

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“…With the content of the CPAN increasement, both the UV and visible emissions of the Ag/ZnO photocatalyst rapidly decrease. The decrease of the emission for the ZnO/CPAN nanocomposites can be ascribed to the electron trapping and transmitting effect of CPAN, which acts as electron acceptor, thus hindering the recombination of charge carriers on ZnO . The electron trapping and transmitting effect of CPAN is favorable for the improvement of the photocatalytic activity of ZnO due to the enhancement of the separation efficiency of photogenerated electrons and holes .…”

Section: Resultsmentioning

confidence: 99%

Enhanced visible light photocatalytic activity of zno nanoparticles modified by cyclized polyacrynitrile

Yin

Liu

et al. 2018

Env Prog and Sustain Energy

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The ZnO/cyclized polyacrylonitrile (CPAN) composites were prepared by impregnation and heat treatment process. The morphology, crystal type, internal structure of ZnO/CPAN nanocomposites were characterized by UV‐vis‐diffuse reflectance spectroscope (DRS), X‐ray diffraction, transmission electron microscopy (TEM), and X‐ray photoelectron spectroscopy (XPS). The visible light photocatalytic activity of ZnO/CPAN was evaluated by degradation of methyl orange under xenon lamp irradiation. The DRS results indicate that the absorption of ZnO/CPAN nanocomposites in the visible region was significantly higher than that of pure ZnO nanoparticles. The TEM results show that the surface of ZnO nanoparticles is occupied by the CPAN in small amount. The results of photocatalytic experiment show that the photocatalytic activity of ZnO nanoparticles can be improved significantly by the modification of CPAN. The possible photocatalytic mechanism was also discussed. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 336–344, 2019

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Tunable Visible Photoluminescence from ZnO Thin Films Through Mg‐Doping and Annealing.

Cited by 9 publications

References 1 publication

Optical properties and sub-bandgap formation of nano-crystalline Si quantum dots embedded ZnO thin film

Optical properties and sub-bandgap formation of nano-crystalline Si quantum dots embedded ZnO thin film

Influence of Annealing on Properties of Spray Deposited ZnO Thin Films

Enhanced visible light photocatalytic activity of zno nanoparticles modified by cyclized polyacrynitrile

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