Abstract: A phosphor layer of a plasma display panel has a green phosphor layer containing Zn2SiO4:Mn particles. The Zn2SiO4:Mn particles satisfy requirements of Zn3p/Si2p?2.06 (1), and Zn2p/Si2p?1.23 (2) wherein Zn3p represents an emission amount of photoelectrons emitted from a 3p orbit of a Zn element in a region up to 10 nm from surfaces of the particles, Zn2p represents an emission amount of photoelectrons emitted from a 2p orbit of the Zn element in a region up to 3 nm from the surfaces of the particles, and Si2p represents an emission amount of photoelectrons emitted from a 2p orbit of a Si element in the region up to 10 nm from the surfaces of the particles.

Abstract: A phosphor layer of a plasma display panel has a green phosphor layer containing Zn2SiO4:Mn particles and (Y1-x, Gdx)3(Al1-y, Gay)5O12:Ce particles. The Zn2SiO4:Mn particles satisfy requirements of Zn3p/Si2p?2.10 (1), and Zn2p/Si2p?1.25 (2) wherein Zn3p represents an emission amount of photoelectrons emitted from a 3p orbit of a Zn element in a region up to 10 nm from surfaces of the particles, Zn2p represents an emission amount of photoelectrons emitted from a 2p orbit of the Zn element in a region up to 3 nm from the surfaces of the particles, and Si2p represents an emission amount of photoelectrons emitted from a 2p orbit of a Si element in the region up to 10 nm from the surfaces of the particles.

Abstract: The present invention provides a plasma display device that has light emission properties with short persistence where green light has a persistence time of 3.5 msec or less, that is excellent in luminance, luminance degradation resistance, and color tone, and that is suitable for, for example, a stereoscopic image display device.

Abstract: A protective layer of a plasma display panel includes a base layer formed on a dielectric layer, and a plurality of aggregated particles dispersed on an entire surface of the base layer. Phosphor layers include a green phosphor layer containing an Mn2+ activated short persistent green phosphor whose 1/10 afterglow time exceeds 2 msec and stays below 5 msec, and a Ce3+ activated green phosphor or an Eu2+ activated green phosphor having a luminescence peak in a wavelength region of at least 490 nm to less than 560 nm.

Abstract: The present invention provides a plasma display device that has light emission properties with short persistence where green light has a persistence time of 3.5 msec or less, that is excellent in luminance, luminance degradation resistance, and color tone, and that is suitable for, for example, a stereoscopic image display device.

Abstract: A dephlegmator includes a feed gas passage and a refrigerant passage. A feed gas introduced into the feed gas passage from the bottom is heat-exchanged with a refrigerant passing through the refrigerant passage. Components having low boiling points are withdrawn as rectified gases from the top, and components having high boiling points are discharged as condensates from the bottom. The refrigerant passage is divided into a first section on the top side and a second section on the bottom side by a bridgewall. In the first section, a liquid or gas-liquid two-phase refrigerant is introduced from the bottom of the refrigerant passage so as to flow parallel to the feed gas. In the second section, a gas fraction of the refrigerant discharged from the first section flows.