초록

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Abstract ▼ AI-Helper

Cu-coated CaS:Eu2+; was synthesized by changing the sintering temperature from 1000℃ to 1500℃, and the A.C. EL device was fabricated using the screen printing method in the following order: ITO PET film, Cu-coated CaS:Eu2+; (phosphor layer), BaTiO3 (insulator layer), and silver electrode. The SEM ...

Cu-coated CaS:Eu2+; was synthesized by changing the sintering temperature from 1000℃ to 1500℃, and the A.C. EL device was fabricated using the screen printing method in the following order: ITO PET film, Cu-coated CaS:Eu2+; (phosphor layer), BaTiO3 (insulator layer), and silver electrode. The SEM images showed that the grain size of phosphor increased as the sintering temperature increased. In photoluminescence measurement, the luminescence intensity was the strongest at the sintering temperature of 1000℃, and decreased when increased the temperature. However, the electroluminescence showed the brightest emission at 1400℃. This discrepancy is due to the grain size which affects the sheet resistance of the electroluminescent device: The lower the sheet resistance the higher the energy of accelerated electrons, which improves the brightness of electroluminescence effectively.

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