ZnO: From basics towards applications

Klingshirn, C.

doi:10.1002/pssb.200743072

Cited by 900 publications

(523 citation statements)

References 403 publications

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“…5 shows the UV absorption spectrum (UV-VIS-NIR spectrophotometer, Shimatzu 3600 model) of pure ZnO (a) and ZnO/starch (b) QDs, the direct band to band transition has occurred and their calculated corresponding bandgap energy values was approximately 3.8 eV (320 nm) calculated using E = hc/k formula. A similar observation was also found by the previous reports (Irimpan et al 2007;Klingshirn 2007), which hold well with our results. In the case of ZnO/starch QDs, a little red shift and enhanced absorption was observed in the peak position when compared with ZnO QDs.…”

Section: Optical Analysissupporting

confidence: 94%

Structural and optical characterization of pure and starch-capped ZnO quantum dots and their photocatalytic activity

Vidhya¹,

Saravanan

Bhoopathi³

et al. 2014

Appl Nanosci

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Among the different types of metal oxides, zinc oxide (ZnO) is a most commonly used metal oxide in a broad variety of applications. In the present investigation, a modified green synthesis route was used to synthesize pure and starch-capped ZnO (ZnO/starch) quantum dots (QDs) and studied their structural and optical characteristics. In this study, hexagonal crystal structure was observed in both pure and ZnO/starch QDs using X-ray diffraction technique. A spherical-shaped surface morphology was found with the size of 5-10 nm using transmission electron microscope technique. The interaction between ZnO QDs and starch molecules was proved via Fourier infra-red spectrometer technique. On the other hand, their fluorescence behaviors were investigated using photoluminescence technique, in that the ZnO/starch QDs showed an enhanced emission behavior when compared to the pure ZnO QDs. Further, the solar photocatalytic activity of both the ZnO QDs was examined with the dye Rhodamine B (RhB) at the end of 30, 60, 90, and 120 min. In this, ZnO/ starch QDs show a good and more decomposition of RhB than pure ZnO QDs. Collectively, in the present study, green synthesis route produced an efficient QDs (pure and ZnO/starch) and it will be very useful for many other QDs. The ZnO/starch QDs are suitable for decomposing the RhB and other toxic organic dyes.

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Section: Optical Analysissupporting

confidence: 94%

Structural and optical characterization of pure and starch-capped ZnO quantum dots and their photocatalytic activity

Vidhya¹,

Saravanan

Bhoopathi³

et al. 2014

Appl Nanosci

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“…Due to these properties, ZnO has been a focus of active research for the past several years [1,2]. In optoelectronics ZnO possesses potential for various applications such as light-emitting diodes and lasers [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Although much research on the origin of the deep band emission has been published, no consensus was reached. ZnO can exhibit different emissions in the visible range including violet, blue, green, yellow, and orange-red, which are associated with intrinsic as well as extrinsic defects [2,13]. The free carrier concentration, doping compensation, minority carrier lifetime, and luminescence efficiency are directly or indirectly related to the defects [14].…”

Section: Introductionmentioning

confidence: 99%

Depth-resolved cathodoluminescence study of zinc oxide nanorods catalytically grown on p-type 4H-SiC

Bano

Hussain

Nur

et al. 2010

Journal of Luminescence

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Optical properties of ZnO nanorods (NRs) grown by vapour-liquid-solid (VLS) technique on 4H-p-SiC substrates were probed by cathodoluminescence (CL) measurements at room temperature and at 5 K complemented with electroluminescence. At room temperature the CL spectra for defect related emission intensity was enhanced with the electron beam penetration depth. We observed a variation in defect related green emission along the nanorod axis. This indicates a relatively poor structural quality near the interface between ZnO NRs and p-SiC substrate. We associate the green emission with oxygen vacancies. Analysis of the low-temperature (5 K) emission spectra in the UV region suggests that the synthesized nanorods contain shallow donors and acceptors.

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“…transparent electronics, spintronics, solar cells, and solidstate white lighting [1][2][3]. Owing to a wide and direct bandgap combined with a large exciton binding energy, ZnO is also among key candidates for efficient light emitters operating in ultraviolet (UV) spectral region.…”

Section: Introductionmentioning

confidence: 99%

Efficient upconversion of photoluminescence via two-photon absorption in bulk and nanorod ZnO

et al. 2012

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Abstract.Efficient upconversion of photoluminescence (PL) from donor bound excitons is revealed in bulk and nanorod ZnO. Based on excitation power dependent PL measurements performed with different energies of excitation photons, two-photon-absorption (TPA) and two-step TPA (TS-TPA) processes are concluded to be responsible for the upconversion. The TS-TPA process is found to occur via a defect/impurity (or defects/impurities) with an energy level (or levels) lying within 1.14-1.56 eV from one of the band edges, without involving photon recycling. One of the possible defect candidates could be V Zn . A sharp energy threshold, different from that for the corresponding one-photon absorption, is observed for the TPA process and is explained in terms of selection rules for the involved optical transitions.

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ZnO: From basics towards applications

Cited by 900 publications

References 403 publications

Structural and optical characterization of pure and starch-capped ZnO quantum dots and their photocatalytic activity

Structural and optical characterization of pure and starch-capped ZnO quantum dots and their photocatalytic activity

Depth-resolved cathodoluminescence study of zinc oxide nanorods catalytically grown on p-type 4H-SiC

Efficient upconversion of photoluminescence via two-photon absorption in bulk and nanorod ZnO

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