Degradation of zinc sulfide phosphors under electron bombardment

Swart, H.C.; Sebastian, J. S.; Trottier, T. A.; Jones, S.J.; Holloway, Paul H.

doi:10.1116/1.580322

Cited by 143 publications

(18 citation statements)

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“…Relatively high energy of the electron beam increases the chance of sample damage during the CL measurements as compared to PL. This damage can occur via different mechanisms, such as adsorption/desorption or charging at the surfaces, creation or activation of defects, etc [64][65][66][67][68][69][70][71]. Such e-beam induced effects reduce the reliability of quantitative CL measurements.…”

Section: Variation Of the CL Intensity During The Measurementsmentioning

confidence: 99%

Low-energy cathodoluminescence microscopy for the characterization of nanostructures

Dierre

Yuan

Sekiguchi

2010

Science and Technology of Advanced Materials

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Spatially and spectrally resolved low-energy cathodoluminescence (CL) microscopy was applied to the characterization of nanostructures. CL has the advantage of revealing not only the presence of luminescence centers but also their spatial distribution. The use of electrons as an excitation source allows a direct comparison with other electron-beam techniques. Thus, CL is a powerful method to correlate luminescence with the sample structure and to clarify the origin of the luminescence. However, caution is needed in the quantitative analysis of CL measurements. In this review, the advantages of cathodoluminescence for qualitative analysis and disadvantages for quantitative analysis are presented on the example of nanostructures.

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Section: Variation Of the CL Intensity During The Measurementsmentioning

confidence: 99%

Low-energy cathodoluminescence microscopy for the characterization of nanostructures

Dierre

Yuan

Sekiguchi

2010

Science and Technology of Advanced Materials

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“…A schematic of the degraded spot and growth of the non-luminescent layer with electron bombardment time is shown in Figure 4b. Holloway and Swart [36,37] came up with a well-known ESSCR (electron stimulated surface chemical reaction) mechanism that was applied to the degradation of several phosphors. According to this model, reactive gas molecules adsorb on the surface of the ZnS phosphor and are dissociated to reactive atomic species by the electron beam.…”

Section: Resultsmentioning

confidence: 99%

Surface Sensitive Techniques for Advanced Characterization of Luminescent Materials

Swart

2017

Materials

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The important role of surface sensitive characterization techniques such as Auger electron spectroscopy (AES), X-ray photo electron spectroscopy (XPS), time of flight scanning ion mass spectrometry (TOF-SIMS) and High resolution transmission electron microscopy (HRTEM) for the characterization of different phosphor materials is discussed in this short review by giving selective examples from previous obtained results. AES is used to monitor surface reactions during electron bombardment and also to determine the elemental composition of the surfaces of the materials, while XPS and TOF-SIMS are used for determining the surface chemical composition and valence state of the dopants. The role of XPS to determine the presence of defects in the phosphor matrix is also stated with the different examples. The role of HRTEM in combination with Energy dispersive spectroscopy (EDS) for nanoparticle characterization is also pointed out.

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“…We think the eroded defects came from the electron bombardment at high current density. High-energy electron bombardment can produce changes in the surface chemical composition on the ZnS phosphors [18,33] and may also create a nonluminescent layer on the surface of the phosphor.…”

Section: Resultsmentioning

confidence: 99%

Improvement of Lighting Uniformity and Phosphor Life in Field Emission Lamps Using Carbon Nanocoils

Chung

Youh

et al. 2015

Journal of Nanomaterials

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The lighting performances and phosphor degradation in field emission lamps (FELs) with two different kinds of cathode materials—multiwalled carbon nanotubes (MWCNTs) and carbon nanocoils (CNCs)—were compared. The MWCNTs and CNCs were selectively synthesized on 304 stainless steel wire substrates dip-coated with nanosized Pd catalysts by controlling the growth temperature in thermal chemical vapor deposition, and the film uniformity can be optimized by adjusting the growth time. FELs were successfully fabricated by assembling these cathode filaments with a glass bulb-type anode. The FEL with the CNC cathode showed much higher lighting uniformity and light-spot density and a lower current at the same voltage than that with the MWCNT cathode filament, and its best luminous efficiency was as high as 75 lm/W at 8 kV. We also found that, for P22, the phosphor degradation can be effectively suppressed by replacing MWCNTs with CNCs in the cathode, due to the much larger total bright spot area and hence much lower current density loading on the anode.

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Degradation of zinc sulfide phosphors under electron bombardment

Cited by 143 publications

References 1 publication

Low-energy cathodoluminescence microscopy for the characterization of nanostructures

Low-energy cathodoluminescence microscopy for the characterization of nanostructures

Surface Sensitive Techniques for Advanced Characterization of Luminescent Materials

Improvement of Lighting Uniformity and Phosphor Life in Field Emission Lamps Using Carbon Nanocoils

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