| Project/Area Number |
05650046
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | Meiji UNIVERSITY |
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Principal Investigator |
NAKANO Ryotaro Meiji Univ., School of Science & Technology, Professor, 理工学部, 教授 (90061960)
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| Co-Investigator(Kenkyū-buntansha) |
MIURA Noboru Meiji Univ., School of Science & Technology, Assistant, 理工学部, 助手 (10257131)
MATSUMOTO Hironaga Meiji Univ., School of Science & Technology, Lecturer, 理工学部, 講師 (50062005)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1994: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1993: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | blue emission / thin-film EL device / rare-earth oxide / rare-earth oxysulfide / reactive deposition / Tm^<3+> ion / Y_2O_2S / La_2O_2S / La_2O_2 |
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| Research Abstract |
Although rare-earth (Y,La, etc) oxide and oxysulfide show efficient luminescence excited with cathode ray and ultraviolet light, there are only a few reports on studies of electro-luminescent devices used these materials, because of difficulty for high quality films.In this study, the growth technique for Tm^<3+> ion doped rare-earth oxysulfide thin films (Y_2O_2 : Tm, La_2O_2S : Tm) having stoichiometric composition are developed in order to obtain the pure blue-emitting electroluminesent device.The following results were obtained.
(1) The coprecipitation method is suitable for the prepareation method of the oxide-fluorescent powder which is used as the starting material for the evaporation.In the case of the oxysulfide-fluorescent powder, it is the suitable technique that sulfur is added in the oxide-fluorescent podwer and fired (sulfuration) .
(2) Oxide-fluorescent thin-films having good crystallinity were obtained.
(3) Oxysulfide-fluorescent thin-films having good crystallinity were also obtained by reactive deposition of the oxide-fluorescent powder and the sulfur.
(4) Rare-earth oxide and rare-earth oxysulfide thin-film electroluminescent devices which have stacked structure of the emission layrs and semicoductor layrs show blue emission.
(5) The excitation mechanism of the emission center was discussed in order to improve the luminance of electroluminescent device.
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