1992 Fiscal Year Final Research Report Summary
Study and improvement of the luminescent and degradation mechanism of organic electroluminescent devices
| Project/Area Number |
02452146
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子材料工学
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| Research Institution | Nagoya University |
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Principal Investigator |
MIZUTANI Teruyoshi Nagoya Univ.Sch.of Eng.Professor, 工学部, 教授 (70023249)
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| Co-Investigator(Kenkyū-buntansha) |
MORI Tatsuo Nagoya Univ.Sch.of Eng.Assistant Professor, 工学部, 助手 (40230073)
SUZUOKI Yasuo Nagoya Univ.Sch.of Eng.Associated Professor, 工学部, 助教授 (10115587)
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| Project Period (FY) |
1990 – 1992
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| Keywords | organic thin film / deposition rate / electroluminescent device / plasma-modification / vacuum-evaporation / work function / dye doping / tris(8-hydroxyquinoline)aluminium |
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| Research Abstract |
Organic EL devices with a structure of ITO/TPD/Alq3/Mg were prepared by the vacuumevaporation method and their EL properties were investigated in order to improve them. The EL device emits strong green light with the polarity of the ITO electrode move through TPD,penetrate into Alq3 and recombine there with electrons which are injected from Mg electrode and arrive at the TPD/Alq3 interface region. Light is emitted through the electron-hole materials. Blue,green and red lights are obtained. In this report, we have investigated the effects of the conditions of film preparation on properties of the organic EL device. Main results obtained are as follows; (1) High deposition rate of Alq3 resulted in high EL. (2) The deposition rate of TPD did not affect the EL intensity. (3) Electron beam evaporation provided a better ITO anode than RF sputtering. (4) Mg which has a low work function resulted in high EL. (5) Plasmamodification on the ITO substrate lowers the driven voltage of EL devices. (6) Doping of DCM and Coumarine gives EL device a high efficiency. (7) Doping of squarylium dye has a new type EL device. It is important for the improvement of the organic EL devices to optimize the conditions of film preparation as well as to select materials.
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