AVS 46th International Symposium
    Flat Panel Displays Topical Conference Monday Sessions
       Session FP-MoA

Paper FP-MoA8
Effect of Ce@sub 2@O@sub 3@ and Ag/Cu Codoping on the Brightness and Efficiency of RF Magnetron Sputtered ZnS:TbOF Alternating Current Thin Film Electroluminescent Displays

Monday, October 25, 1999, 4:20 pm, Room 604

Session: Luminescent Thin Films
Presenter: D.J. Moorehead, University of Florida
Authors: J.P. Kim, University of Florida
D.J. Moorehead, University of Florida
K.E. Waldrip, University of Florida
B. Speck, University of Florida
M. Davidson, University of Florida
P.H. Holloway, University of FLorida
Q. Zhai, University of Florida
Correspondent: Click to Email
ZnS:TbOF has shown promise as a green electroluminescent phosphor, but it still lacks the performance necessary to incorporate it into a commercially viable ACTFEL device. Many codopants have been shown to improve the performance of such devices. This study reports the results of Ce@sub 2@O@sub 3@ and Cu/Ag codoping on the brightness and efficiency of ZnS:TbOF thin film EL devices. As-deposited Ce codoped ZnS:TbOF films showed no significant change in brightness. Annealing of low Ce concentration half-stack (no top dielectric) devices improved EL brightness by 65% over the best undoped samples. Scanning electron microscopy shows no significant morphology changes in annealed films. Ag/Cu codoping did not dramatically effect the brightness of as-deposited films, but there were significant improvements in BV characteristics of annealed samples. Half-stack data show a much sharper turn-on and B20 improvement from 32 cd/m2 to 70 cd/m2. Samples annealed at high-temperature (850°C) demonstrated severe degradation in brightness and efficiency, while SEM micrographs show that grain size significantly decreased, possibly due to precipitation of another phase.