Electroluminescence from surface layer of insulating polymer under ac voltage application

Matsunaga, Tomohisa; Liu, Yuan-Shing; Shionoya, W.; Okada, Masami; Yasuoka, K.; Ishii, Shozo; Yokoyama, A.; Miyata, Hiroyuki

doi:10.1109/94.740774

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…2(a), the luminescence is hardly detected under low applied voltage, e.g., 10.0 kV. For a higher voltage, e.g., 13.0 kV, obvious luminescence is observed, as presented in Fig. 2(b).…”

Section: A Luminescence Evolution Characteristics Under DC Excitationmentioning

confidence: 88%

Luminescence evolution from alumina ceramic surface before flashover under direct and alternating current voltage in vacuum

Wang

Song

et al. 2016

AIP Advances

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The luminescence evolution phenomena from alumina ceramic surface in vacuum under high voltage of direct and alternating current are reported, with the voltage covering a large range from far below to close to the flashover voltage. Its time resolved and spatial distributed behaviors are examined by a photon counting system and an electron-multiplying charge-coupled device (EMCCD) together with a digital camera, respectively. The luminescence before flashover exhibits two stages as voltage increasing, i.e., under a relative low voltage (Stage A), the luminescence is ascribed to radiative recombination of hetero-charges injected into the sample surface layer by Schottky effect; under a higher voltage (Stage B), a stable secondary electron emission process, resulting from the Fowler-Nordheim emission at the cathode triple junction (CTJ), is responsible for the luminescence. Spectrum analysis implies that inner secondary electrons within the surface layer of alumina generated during the SSEE process also participate in the luminescence of Stage B. A comprehensive interpretation of the flashover process is formulated, which might promote a better understanding of flashover issue in vacuum.

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“…2(a), the luminescence is hardly detected under low applied voltage, e.g., 10.0 kV. For a higher voltage, e.g., 13.0 kV, obvious luminescence is observed, as presented in Fig. 2(b).…”

Section: A Luminescence Evolution Characteristics Under DC Excitationmentioning

confidence: 88%

Luminescence evolution from alumina ceramic surface before flashover under direct and alternating current voltage in vacuum

Wang

Song

et al. 2016

AIP Advances

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“…Similar phenomena due to EL have been found from the polymer surface while using concentric gold electrodes under ac voltage. 12 As shown in Fig. 2͑d͒, the discharge was first observed from the area near to the corner of the electrodes at a slightly high voltage.…”

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confidence: 86%

Influence of electrode contact on luminescence from alumina ceramic surface under ac electric field in vacuum

Zhang

Liu

et al. 2001

Applied Physics Letters

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Electroluminescence from semitransparent Au film/ SiO 2 /(amorphous-Si/SiO 2 ) superlattice/ p-Si structure The luminescence from a planar metal-alumina-metal structure was investigated under ac voltage application in vacuum. Two kinds of electrode contacts, i.e., with/without sputtered gold film, showed quite different optical phenomena. For the nonsputtered alumina samples, no luminescence was detected until extremely irregular light pulses resulted from partial discharges under higher voltage. While for the sputtered samples, from far lower applied voltage, there was faint but stable light emission due to electroluminescence ͑EL͒ observed. Based on the band theory of solids, we proposed a model to explain the interesting phenomena qualitatively. Taking account of the sputtering process, a marked reduction of the potential barrier between electrodes and alumina surface would result. Thus, charge carriers can be easily injected from the electrodes into the surface layer of alumina, and EL will emit due to the radiative recombination of electrons and holes. It is considered that EL has a significant influence on the developing process of surface flashover.

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Optical observation of preflashover phenomena from polytetrafluoroethylene in a planar concentric structure

Zhang

Liu

et al. 2003

Journal of Applied Physics

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The optical emission from polytetrafluoroethylene (PTFE) surfaces in a planar concentric metal-polymer-metal structure was investigated under ac electric field in vacuum. Two kinds of optical pattern were observed before the flashover; they were strongly dependent on the magnitude of applied voltage. At a lower applied voltage, the light emission was weak and uniform and was observed close to the edges of both electrodes. It may be considered as electroluminescence phenomena due to the radiative recombination of electrons and holes injected from the electrode into the polymer surface layer. With increase of the applied voltage, the optical emission became significantly strong and irregular, and its activity area gradually expanded from the inner electrode to the outer electrode. The accumulation of electrons injected is supposed to form a long-term negative space charge region away from the inner electrode. A strong modification of the local electric field near its border would result in the detrapping of trapped electrons at a critical applied voltage and hence cause forward/backward secondary electron emission on the surface of PTFE, accompanied by intense light emission and a wide luminescent area, and probably lead to the final surface flashover. It is concluded that the negative charge region is likely located around ∼2.6 mm from the inner electrode edge.

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Electroluminescence from surface layer of insulating polymer under ac voltage application

Cited by 9 publications

References 18 publications

Luminescence evolution from alumina ceramic surface before flashover under direct and alternating current voltage in vacuum

Luminescence evolution from alumina ceramic surface before flashover under direct and alternating current voltage in vacuum

Influence of electrode contact on luminescence from alumina ceramic surface under ac electric field in vacuum

Optical observation of preflashover phenomena from polytetrafluoroethylene in a planar concentric structure

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