| 摘要 |
PROBLEM TO BE SOLVED: To provide a light emitting device and an electric appliance which have low electric power consumption and long life. SOLUTION: This light emitting device keeps an organic compound film 403 incorporating a hole transporting region 405 made from a hole transporting material, an electron transporting region 409 made from an electron transporting material, and a mixture region 407 in which both the hole transporting material and the electron transporting material are mixed at a fixed ratio, and regions 406, 408 with a concentration gradient formed between the mixture region 407 and carrier transporting regions 405-409 until the fixed ratio is achieved. Further, by doping a light emitting material 410 into the mixture region 407 to form a light emitting region, the device allows respective functions of hole transportation, electron transportation, and light emitting to be haven while all of the interfaces existing between layers of a conventional lamination structure are removed. This technique allows organic light emitting elements having low electric power consumption and long life to be provided, and the light emitting device and the electric appliance to be manufactured using the organic light emitting elements. COPYRIGHT: (C)2008,JPO&INPIT
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