Research in luminous efficacy of the mercury free plasma flat panel lamps

Influences of the gas pressures,the gas compositions and gas gaps,the structure and the phosphor printing on the luminous efficacy of the mercury-free plasma flat panel fluorescent lamps were investigated.Marked increments in the luminous efficacy of the lamps were observed by optimizing the conditions.The results showed that the130mm×90mm plasma flat panel fluorescent lamps with a luminance of 11000cd.m?2,a luminous flux of 500lm and an luminous efficacy of above 40lm.W?1 could be attained at 450torr pure xenon,0.7mm gap distance,2.8mm front glass layer thickness and 60% phosphor pattern printing 20?m layer on the front glass.Higher luminance and higher luminous efficacy were realized by the optimization.The factors influencing the luminous efficacy were discussed.