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

Paper FP-MoA7
Multicolor Emitting TFEL Devices using Ga@sub 2@O@sub 3@ Phosphors Co-doped with Mn and Cr

Monday, October 25, 1999, 4:00 pm, Room 604

Session: Luminescent Thin Films
Presenter: T. Nakatani, Kanazawa Institute of Technology, Japan
Authors: T. Minami, Kanazawa Institute of Technology, Japan
T. Nakatani, Kanazawa Institute of Technology, Japan
T. Miyata, Kanazawa Institute of Technology, Japan
Correspondent: Click to Email
This paper introduces newly developed TFEL devices consisting of Mnand Cr-co-doped Ga@sub 2@O@sub 3@ phosphor thin-film emitting layers combined with a thick BaTiO3 ceramic sheet insulating layer. The co-doping effects of Mn doped into Ga@sub 2@O@sub 3@:Cr thin films and Cr doped into Ga@sub 2@O@sub 3@:Mn thin films on their electroluminescent properties have been investigated. Ga@sub 2@O@sub 3@:Mn,Cr phosphor thin films were prepared using a solution coating technique. The Mn and Cr dopant contents (Mn/(Mn+Ga) and Cr/(Cr+Ga) atomic ratios) were varied from 0 to 20 atomic%. In order to improve the EL characteristics, all deposited Ga@sub 2@O@sub 3@:Mn,Cr phosphor thin films were post-annealed in an Ar atmosphere for 1 h at 1020@super o@C. The emission from Ga@sub 2@O@sub 3@:Mn,Cr TFEL devices was more strongly dependent on the Cr content than on the Mn content doped into the phosphor emitting layers. A high luminance above 100 cd/m@super 2@ was obtained in all TFEL devices using Ga@sub 2@O@sub 3@:Mn,Cr thin films co-doped with a Cr content from 0 to 20 at.% and a Mn content of 0.3 at.% when driven at 1 kHz. The emission color from these Ga@sub 2@O@sub 3@:Mn,Cr TFEL devices changed from green to red emission as the co-doped Cr content was varied from 0 to 20 at.%. In addition, the emission color changed from green to red as the applied voltage was increased. Thus, Ga@sub 2@O@sub 3@:Mn,Cr TFEL devices would be useful in color indicators and displays, with color controlled by the applied voltage.