ZnO rediscovered — once again!?

Klingshirn, C.; Hauschild, Robert; Priller, H.; Decker, Manuel; Zeller, Jürgen; Kalt, H.

doi:10.1016/j.spmi.2005.07.003

Cited by 105 publications

(65 citation statements)

References 93 publications

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“…[11,12] The dependence of the absorption edge on the crystal size in ZnO nanocrystals has been investigated by Meulenkamp and an empirical formula for ZnO nanocrystals has been obtained. [3] Applying the formula we obtained 3.29 nm for the average diameter and this value is in good agreement with the X-ray diffraction result.…”

Section: Methodsmentioning

confidence: 99%

Enhanced band-edge photoluminescence from MgO passivated ZnO nanocrystals

Yamamoto

Mishina

2011

Journal of Luminescence

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Intense band-edge photoluminescence is observed from ZnO nanocrystals with an average diameter of about 3 nm. It is found that the growth from high temperature (70 • C) precursor solution and succeeding surface passivation by MgO layer together lead to a five times enhancement of band-edge luminescence, in comparison to those grown by conventional low-temperature method without surface passivation. It is also found that above-band-gap illumination on the nanocrystals further enhances the luminescence intensity by five times. The strong photo-enhancement is considered to be aided by the reduction of surface non-radiative recombination path.

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Section: Methodsmentioning

confidence: 99%

Enhanced band-edge photoluminescence from MgO passivated ZnO nanocrystals

Yamamoto

Mishina

2011

Journal of Luminescence

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“…Zinc oxide (ZnO) is a wide-bandgap semiconductor that is being extensively investigated for the development of optoelectronic devices operating in the blue-to-near-UV spectral region [1,2]. In addition to its large bandgap energy (~3.3 eV), ZnO possesses a large exciton binding energy (~60 meV) [2,3] and can easily be handled to yield uniform and high-quality ZnO nanostructures without the use of highly toxic precursors [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear spectra of ZnO: reverse saturable, two- and three-photon absorption

Vivas¹,

Shih²,

Voss³

et al. 2010

Opt. Express

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We present a broadband (460 -980 nm) analysis of the nonlinear absorption processes in bulk ZnO, a large-bandgap material with potential blue-to-UV photonic device applications. Using an optical parametric amplifier we generated tunable 1-kHz repetition rate laser pulses and employed the Z-scan technique to investigate the nonlinear absorption spectrum of ZnO. For excitation wavelengths below 500 nm, we observed reverse saturable absorption due to one-photon excitation of the sample, agreeing with rate-equation modeling. Two-and three-photon absorption were observed from 540 to 980 nm. We also determined the spectral regions exhibiting mixture of nonlinear absorption mechanisms, which were confirmed by photoluminescence measurements.

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“…The cooled sample was then washed with a small amount of distilled water (~20 cm 3 ) and filtered under vacuum to remove any surface Zn(NO 3 ) 2 .6H 2 O not absorbed by the zeolite. Oxidised samples are hereafter denoted FER/ZnO-M Wet impregnation was carried out by adding a known amount of FER to an aqueous solution of Zn(NO 3 ) 2 and stirring for several hours with gentle heating until the solvent evaporated. In using this method a precise Zn loading of the zeolite was achieved.…”

Section: Methodsmentioning

confidence: 99%

“…Over the past decade there has been intensive research into the growth and synthesis of nanostructured, semiconducting materials, such as quantum dots, wires and nanorods, with the promise of altered and improved optical properties as a result of quantum confinement effects. [1] ZnO; a wide direct band-gap II-VI semiconductor with a bulk band gap of 3.37 eV at 298 K and a relatively high exciton binding energy of 60 meV [2] that allows significant exciton emission at room temperature, has been studied in this work. Previous attempts at nanoscale production of ZnO particles have utilized methods such as colloidal precipitation [3] and metal organic chemical vapour deposition (MOCVD) [4] , which can lead to aggregation of ZnO particles.…”

Section: Introductionmentioning

confidence: 99%

A Novel Route to Zeolite-Templated ZnO Quantum Wires

Baker

Ouali

Hix

2010

J. Phys.: Conf. Ser.

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Abstract. ZnO nanoparticles were synthesised within the pores of the zeolite ferrierite (FER) by a novel molten salt impregnation method and compared to a traditional wet impregnation method. The structure and optical properties were characterised by powder XRD, photoluminescence and UV-visible diffuse reflectance spectroscopy. The XRD results reveal a distinct difference in the effect of the impregnation method on the zeolite framework. The optical data show blue-shifts in the absorption and emission profiles of encapsulated ZnO with respect to the bulk material.

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ZnO rediscovered — once again!?

Cited by 105 publications

References 93 publications

Enhanced band-edge photoluminescence from MgO passivated ZnO nanocrystals

Enhanced band-edge photoluminescence from MgO passivated ZnO nanocrystals

Nonlinear spectra of ZnO: reverse saturable, two- and three-photon absorption

A Novel Route to Zeolite-Templated ZnO Quantum Wires

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