ZnGa[sub 2]O[sub 4]:Mn phosphors for Thin-Film Electroluminescent Displays Exhibiting Improved Brightness

Abstract

Thin films of ZnGa2O4:normalMn films have been deposited by radio frequency magnetron sputtering in order to study the effects of annealing temperatures less than 1000°C on the thin-film electroluminescent properties. Energy-dispersive X-ray compositional analysis showed a loss of zinc during sputtering, with the film composition being Zn0.9Mn0.03Ga2O4. All films showed strong (111) and (222) X-ray reflections relative to the power standard. As the annealing temperature was raised, the texture rotated toward that of the powder material. The as-deposited films showed no photoluminescence; however, once annealed at T⩾750°C, a single emission band at 504 nm was observed. Emission wavelength was independent of annealing temperature. The electroluminescent brightness of the devices peaked at an annealing temperature of 900°C. Peak brightness and efficiency were 350 normalcd/m2 and 0.55 lm/W at 60 Hz, and 1500 normalcd/m2 and 0.30 lm/W at 600 Hz. These high brightness values have been attributed to the roughness of the substrates. © 2001 The Electrochemical Society. All rights reserved.

Combustion synthesis and optical properties of ceria doped gadolinium-oxide nanopowder

“…High efficiencies [6], ultra-fast recombination times [7], interesting nonlinear optical behaviors [8] and unusual fluorescence were observed in nanometer sized nanocrystals [9]. Nowadays, oxide phosphors, due to their super chemical stability than the commonly used sulfides, have been extensively studied for use in various emissive flat panel displays [10,11]. Gadolinium oxide (Gd 2 O 3 ) has been shown to be a good host for the luminescence of rare earth ions [12,13].…”

UV and X-ray excited luminescence of Tb3+-doped ZnGa2O4 phosphors

“…Zinc gallate (ZnGa 2 O 4 ) has attained much attention since last decade as a promising phosphor used in thin film electroluminescence display (TFELD) [1][2][3], field emission display (FED) and vacuum fluorescent display (VFD) [4,5]. As an oxide-based phosphor, ZnGa 2 O 4 exhibits higher chemical stability under high electric field and electron bombardment than conventional sulphide-based phosphors.…”

Developments in Luminescence and Display Materials Over the Last 100 Years as Reflected in Electrochemical Society Publications

“…The material structure was analyzed and found to be composed of cubic and hexagonal phases, the latter having high brightness and low voltage operation. Flynn and Kitai 206 reported on ZnGa 2 O 4 :Mn phosphor and its application as thin film electroluminescent display exhibiting high brightness. A single emission band at 504 nm was observed following a T у 750°C annealing.…”