AVS 47th International Symposium
    Flat Panel Displays Tuesday Sessions
       Session FP-TuM

Paper FP-TuM7
Eu@super +3@ and Cr@super +3@ Doping for Red Cathodoluminescence in ZnGa@sub 2@O@sub 4@

Tuesday, October 3, 2000, 10:20 am, Room 313

Session: Luminescent Materials
Presenter: J.J. Peterson, Advanced Vision Technologies, Inc.
Authors: J.J. Peterson, Advanced Vision Technologies, Inc.
P.D. Rack, Rochester Institute of Technology
M.D. Potter, Advanced Vision Technologies, Inc.
Correspondent: Click to Email
Cathodoluminescence (CL) emission spectra and photoluminescence (PL) excitation spectra were used to evaluate Eu@super +3@ and Cr@super +3@ as activators for red luminescence in ZnGa@sub 2@O@sub 4@. In the Eu@super +3@ doped ZnGa@sub 2@O@sub 4@ materials blue host emission was observed at high current densities and is attributed to ground state depletion of the Eu@super +3@ activators. In addition, PL excitation measurements revealed poor energy-transfer from the ZnGa@sub 2@O@sub 4@ host to the Eu@super +3@ ions. Cr-doping resulted in a saturated red-color and no host emission was observed over the entire current density regime investigated. The PL excitation of the ZnGa@sub 2@O@sub 4@:Cr@super +3@ revealed good overlap between the host emission and the O-Cr@super +3@ ligand-to-metal charge transfer absorption band. Cathodoluminescence efficiency and emission spectra of various compositions will be presented as a function of current density. The relevant energy transfer theory for the red emission in Eu@super +3@ and Cr@super +3@ doped ZnGa@sub 2@O@sub 4@ will be discussed. Finally, a process that integrates Cr@super +3@ (red), Mn@super +2@ (green) and intrinsic ZnGa@sub 2@O@sub 4@ (blue) into a single thin film for high-resolution field emission display applications will be shown.