| 摘要 |
PROBLEM TO BE SOLVED: To provide an organic EL display device in which positive hole excess or electron excess is suppressed by reducing a difference between the positive hole mobility of a positive hole transportation layer and the electron mobility of an electron transportation layer, and in which light emitting efficiency can be improved by nearly equalizing injection balance between a positive hole and an electron. SOLUTION: Because a positive electrode 2, the positive hole transportation layer 3, a light emitting layer 4, the electron transportation layer 5, an electron injection layer 6, and a negative electrode 7 are laminated sequentially on a translucent glass substrate 1, and the positive hole transportation layer 3 and the electron transportation layer 5 joined to both sides of the light emitting layer 4 are formed of organic materials containing IV group elements other than carbon, the difference between the positive hole mobility of the positive hole transportation layer 3 and the electron mobility of the electron transportation layer 5 becomes smaller, and the positive hole mobility and the electron mobility become equal, and because the positive hole excess or the electron excess to the light emitting layer 4 is suppressed, the injection balance between the positive hole and the electron becomes equal, light emitting efficiency is improved, and the electric power consumption of the organic EL display device is reduced. COPYRIGHT: (C)2005,JPO&NCIPI
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