Abstract
recombination process iii Y2O2S:Eu3 phosphursHajime Yamamoto and Hidetsugu Matsukiyo*Department of Electronics, rCoo Engineering University1404-1, Katakura-cho, Hachioji, Tokyo 192, Japanand*Central Research Liboratory, Hitachi Ltd.P.O.Box 2, Kokubunji, Tokyo 185, JapanABSTRACFA red cathode-ray phosphor, Y2OS:Eu3, shows a large decrease in luminescence efficiency at highexcitation density at room temperature. The luminescence intensity is approximately proportional to the squareroot of the electron-beam current, indicating that a bimolecular-type nonradiative process competes with aradiative process. In undoped Y2OS, broad luminescence bands with peaks at around 35
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