Cathodoluminescence Emission Spectra of Zinc-Oxide Phosphors

Shrader, Ross E.; Leverenz, H. W.

doi:10.1364/josa.37.000939

Cited by 25 publications

(12 citation statements)

References 2 publications

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“…Since the green PL emission from the as-received sample is very weak, we annealed the sample powder in a reducing atmosphere (5%H 2 -95%Ar mixed flowing gas) at 1000 C for 1 h to intentionally enhance the green PL emission. [13][14][15] The reduced form of ZnO is often denoted as ZnO:Zn because of the loss of oxygen during the reducing treatment. 8 In what follows, the asreceived and H 2 /Ar-treated ZnO samples will be referred to as ZnO and ZnO:Zn, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…1), as has already been demonstrated by a number of researchers. [13][14][15] In this paper, we will show the results of temperature dependent PL and PLE measurements performed exclusively for the ZnO:Zn sample. Figure 2(a) displays the PL spectra of the ZnO:Zn sample obtained for the temperature range of 77-350 K under optical excitation (4.75 eV) with energy well above the band gap, showing two typical PL bands in the UV and green regions.…”

Section: Methodsmentioning

confidence: 99%

“…(16)] although some of the photoexcited electrons relaxing to the shallow donor state will also be transferred to the emitting T 1 state via thermal reexcitation to the conduction band [Eqs. (12)- (14)]. The thermally assisted indirect emission process tends to dominate over the direct emission process as the excitation energy drops near or below the bottom edge of the conduction band [see Fig.…”

Section: Structural Origin Of the Green Pl Emissionmentioning

confidence: 99%

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Thermally activated below-band-gap excitation behind green photoluminescence in ZnO

Kodama

Uchino

2012

Journal of Applied Physics

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We explore the temperature dependence of the photoluminescence (PL) and photoluminescence excitation characteristics of the green emission band in undoped ZnO crystals. We find that there exists a thermally assisted luminescence channel, which tends to dominate over the existing luminescence channel especially under below-band-gap excitation. Shallow donor electrons are likely to contribute to the thermally assisted luminescence process by being thermally excited from the donor levels to the conduction band. We hence suggest that the shallow donor centers, which are presumably attributed to zinc interstitials and will not act as emitting centers by themselves, are indirectly responsible for the green PL emission. The most probable candidate of the emitting center is the neutral oxygen vacancy, showing the green emission either via a direct internal emission process or an indirect thermally assisted emission process in combination with shallow donor centers. V C 2012 American Institute of Physics. [http://dx.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Structural Origin Of the Green Pl Emissionmentioning

confidence: 99%

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Thermally activated below-band-gap excitation behind green photoluminescence in ZnO

Kodama

Uchino

2012

Journal of Applied Physics

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“…1,2 ZnO has the good property of being able to produce blue-green luminescence and absorption in the ultraviolet (UV) region, which is exploited for sunscreens, textile industries, catalysts, sensors, photodetectors, and for obtaining solar energy. [3][4][5][6][7][8][9][10] Keeping the scope of its applications in mind, the different morphologies of ZnO nanoparticles (ZNPs) are developed as nanoflowers, nanorods, nanowhiskers, nanobelts, nanotubes, nanorings, nanocolumns, and so on.…”

Section: Introductionmentioning

confidence: 99%

Flower-shaped ZnO nanoparticles synthesized by a novel approach at near-room temperatures with antibacterial and antifungal properties

Khan¹,

Hameedullah²,

Ansari³

et al. 2014

IJN

114

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Due to enormous applications of metal oxide nanoparticles in research and health-related applications, metal oxide nanoparticles are increasingly being developed through cheaper and more user-friendly approaches. We have formulated a simple route to synthesize zinc oxide nanoparticles (ZNPs) by a sol–gel method at near-room temperatures 25°C, 35°C, 55°C, and 75°C. The results are analyzed by X-ray diffraction, scanning electron microscopy with energy-dispersive X-ray spectroscopy, and ultraviolet-visible absorption spectroscopy. The effect of different temperature conditions (25°C–75°C) on the particulate sizes (23.7–88.8 nm), pH levels (11.7–11.9), and morphologies (slender needle–broad arrow) of flower-shaped ZNP colonies is studied. A possible mechanism depicting the growth rates at different temperatures and of different facets, mainly towards the <0 0 0 I> and <0 I Ī 0> planes of the ZNPs has also been discussed. The values of λ max (293–298 nm) suggest that ZNPs prepared at 55°C are the most effective ultraviolet B absorbers, and that they can be used in sunscreens. Highly significant antimicrobial activity against medically important Gram-positive ( Staphylococcus aureus ) and Gram-negative ( Escherichia coli ) bacteria and fungi ( Candida albicans ) by these ZNPs was also revealed. As S. aureus and C. albicans are responsible for many contagious dermal infections such as abscesses, furuncles, carbuncles, cellulitis, and candidiasis, we can postulate that our fabricated ZNPs may be useful as antimicrobial agents in antiseptic creams and lotions for the treatment of skin diseases.

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“…2). As in zinc oxide itself (15), an ultraviolet emission band is present. In this band, efficiency increases as the magnesium oxide content approaches 25 mole per cent, and again rapidly decreases after this point (Fig.…”

Section: Preparation Of Phosphorsmentioning

confidence: 99%

Zinc-Magnesium Oxide and Zinc-Magnesium Sulfide Phosphors

Smith

1952

J. Electrochem. Soc.

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Zinc-magnesium oxide phosphors were briefly investigated, and procedures developed for producing highly efficient phosphors containing no intentional additions of either activator or flux.True solid solutions of zinc and magnesium sulfides exist, up to at least 25 mole per cent magnesium sulfide. With silver or copper as an activating agent, a shift in luminescence to shorter wavelengths occurs as the magnesium sulfide content increases. With manganese activation, emission is not appreciably affected by the addition of magnesium sulfide. Eifieieneies are good under both ultraviolet and electron excitation, and a longduration phosphorescence can be obtained by electron excitation of the copper-activated materials. Lead, antimony, arsenic, and bismuth can also be utilized as activators to give etIieient phosphors.

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Cathodoluminescence Emission Spectra of Zinc-Oxide Phosphors

Cited by 25 publications

References 2 publications

Thermally activated below-band-gap excitation behind green photoluminescence in ZnO

Thermally activated below-band-gap excitation behind green photoluminescence in ZnO

Flower-shaped ZnO nanoparticles synthesized by a novel approach at near-room temperatures with antibacterial and antifungal properties

Zinc-Magnesium Oxide and Zinc-Magnesium Sulfide Phosphors

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