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High luminance ZnS:Mn/SrS:Ce TFEL devices


Society for Information Display -SID-:
International Display Research Conference and International Workshops on Active-Matrix LCDs & Display Materials 1994. Conference record : Papers presented at Hyatt Regency Hotel, Monterey, California, October 10 - 13, 1994
Santa Ana, Calif.: Society for Information Display, 1994
International Display Research Conference (IDRC) <14, 1994, Monterey/Calif.>
International Workshop on Active-Matrix LCDs & Display Materials <1994, Monterey/Calif.>
Conference Paper
Fraunhofer HHI ()
cerium; electroluminescent displays; ii-vi semiconductors; manganese; phosphors; strontium compounds; vacuum deposition; zinc compounds; full colour electroluminescent displays; colour by white concept; zns:mn/srs:ce multilayer phosphors; high luminance tfel devices; device fabrication; reactive evaporation; yellowish-white luminance level; luminous efficiency; s-precursor; 1 khz; 60 hz; zns:mn-srs:ce

Full colour electroluminescent (EL) displays according to the "colour by white" concept are a promising candidate for various future display applications. ZnS:Mn/SrS:Ce multilayer phosphors have demonstrated their capability to fulfil the requirements of this concept. While ZnS:Mn is a standard industrial process SrS:Ce needs further improvements. Very recently, a new process to fabricate efficient SrS:Ce EL devices based on a novel S-precursor during reactive evaporation has been developed. In conventional device structures, efficiencies up to 1.4 Im/W have been obtained. Introducing this new process into a ZnS:Mn/SrS:Ce multilayer device, yellowish-white luminance level as high as 4200 cd/m2 at 1 kHz drive was reached. Driving the device at 60 Hz frequency results in following unfiltered and filtered luminances: L=340 cd/m2, Lr=39 cd/m2, Lg=90 cd/m2, Lb=18 cd/m2.