Direct observations of vacuum ultraviolet rays for surface‐discharge ac plasma displays by using an ultra‐high‐speed electronic camera

Abstract

Abstract— Vacuum ultraviolet (VUV) rays emitted from Xe during the operation of surface‐discharge ac plasma‐display panels (PDPs) were observed directly by using a recently developed ultra‐high‐speed electronic camera. It is confirmed that 147‐ and 173‐nm VUV rays are emitted from both the cathode and the anode simultaneously. The direct observation shows that the emitting area for 147‐ and 173‐nm emissions above the cathode and the anode extends outward from the edge of the gap. These emission extensions are considered to be caused by a lowering of the electric field above the area due to the accumulation of wall charges. The intensity of the 147‐ and 173‐nm emissions above the anode decays faster than those above the cathode. It is clarified that the difference in the decay characteristics of VUV rays above the cathode and the anode is caused by the difference in the wall‐charge‐accumulation rates above the cathode and the anode. The major reactions concerning the generation of Xe(1s4), a xenon resonant state, which is related to 147‐nm emission, and that of Xe2Y*, a xenon molecule state, which is related to 173‐nm emission, are discussed.

Plasma display panels: physics, recent developments and key issues

“…ICCD cameras have also been used to measure images of the VUV emission measurements. Such VUV imaging measurements have been reported by Sawa et al [167] and Yoon et al [168] and show that photon emission from the resonant line at 147 nm (Xe * ) and from the 173 nm continuum (Xe *…”

Space and time evolution of the plasma in a PDP cell: Comparisons between simulations and experiments

“…This indicates that the plasma above the anode is more efficient in term of xenon excitation and therefore of UV production than the plasma above the cathode. The VUV measurements 7,8 in real PDP cells confirm that the plasma above the anode also emits UV photons, which is coherent with the above discussion.…”

“…We have compared the space and time variations of the measured light emission from xenon and neon lines with results from two-dimensional fluid models. 8,2 The agreement is qualitatively good and the model reproduces well the features described above. We only report here comparisons between the measured and calculated plasma expansion (or sheath contraction) velocity (defined in Fig.…”

Physical phenomena in a coplanar macroscopic plasma display cell I. Infrared and visible emission

“…The VUV emission measurements of Sawa et al 4 and Yoon et al 3 show that photon emission from the resonant line at 147 nm (Xe*) and from the 173 nm continuum (Xe 2 *) are present above both cathode and anode. This is consistent with the infrared emission measurements.…”

“…These measurements can be classified in three categories: ͑1͒ infrared xenon emission and visible neon emission 2,3,13-16 ͑as in the present article͒, ͑2͒ vacuum ultraviolet emission, 3,4,17 and ͑3͒ infrared absorption. These measurements can be classified in three categories: ͑1͒ infrared xenon emission and visible neon emission 2,3,13-16 ͑as in the present article͒, ͑2͒ vacuum ultraviolet emission, 3,4,17 and ͑3͒ infrared absorption.…”