High efficiency blue from SrS:Ce/ZnS:Mn 'color by white' thin film electroluminescence devices

In this contribution we report on the performance of an improved blue emission of broad band emitting thin film electroluminescent (TFEL) structures for full color TFEL displays employing the 'color by white' concept. The used white emitter consists of a stacked phosphor of blue-green emitting cerium doped strontium sulfide (SrS:Ce) and orange-red emitting manganese doped zinc sulfide (ZnS:Mn). A filtered blue luminance 50 V above threshold of L50=14 cd/m2 at 60 Hz has been measured using a Fuji Hunt dye filter, resulting in a luminous efficiency of eta =0.13 Im/W. The CIE color coordinates are (x=0.1/ly=0.26).