We developed a mercury free Flat Fluorescent Lamp (FFL) with a high luminance by using the same discharge mode as PDP. Our FFL has the simple structure where the glass substrates are used as the dielectric layer. The panel has a striped line shape of 7-inch diagonal size. The Xe-Ne-He mixture gas was used to generate the plasma, and the gas discharge characteristics under both total gas pressure and partial gas pressure were investigated. The panel showed a maximum high luminance 7,270 cd/m(2) under biasing 20 kHz pulse of 3 kV.