A plasma display panel and an imaging device realize a high luminous
efficiency, a long lifetime and stable driving. The plasma display panel
uses a discharge-gas mixture containing at least Xe, Ne and He. A Xe
proportion of the discharge-gas mixture is in a range of from 2% to 20%,
a He proportion of the discharge-gas mixture is in a range of from 15% to
50%, the He proportion is greater than the Xe proportion, and a total
pressure of the discharge-gas mixture is in a range of from 400 Torr to
550 Torr. A width of a voltage pulse to be applied to an electrode
serving as an address electrode is 2 .mu.s or less.