| 简介 |
New oxide phosphors based on doped gallium oxides, alkaline earth gallates a nd germanates for electroluminescent display materials. Bright orange red electroluminescence has been obtained in amorphous and crystalline oxides Ga2O3 : Eu for the first time. SrGa2O4 and SrGa4O9 doped with 1-8 mole % of Eu and Tb, CaGa2O4, Ca3Ga2O6 and CaGa4O7 doped with 1-4 mole % of Eu, Tb, Pr and Dy, BaGa2O4 doped with 1-2 mole % of Eu and Tb, have been prepared using RF magnetron sputtering onto ceramic dielectric substrates and annealed at 600 .degree.C - 950 .degree.C in air or Ar for 1-2 hours. Bright electroluminescent (EL) emission was obtained with wavelengths covering the visible sprectrum from 400 to 700 nm, and infrared emission above 700 nm wit h spectral peaks characteristic of rare earth transitions. The films of CaGa2O4 with 1 mole % Eu achieved 22 fL (75 cd/m2) at 60 Hz and had a maximum efficiency of 0.2 lm/w for red emission. An amorphous thin film of Ca3Ga2O6 with 2 mole % Eu achieved 34 fL in red EL at 60 Hz when annealed at 600 .degree.C. SrGa2O4 with 1 mole % Eu and 4 mole % Tb yielded "white" phosphor having red, green and blu e emission (13 fL at 60 Hz), and SrGa2O4 with 8 mole % Tb resulted in a blue and green phosphor measuring 30 fL at 60 Hz. Zn2Si0.5Ge0.5O4 containing Mn was sputtered using magnetron RF sputtering onto ceramic dielectric substrates and annealed at 700 .degree .C for 1 hour in air or argon. Bright green (540 nm) emission was obtained in electroluminescence : 110 fL (377 cd/m2) at 60 Hz with a maximum efficiency of 0.9 l/w. Moderately bright red emission (640 nm) was also obtained. |
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