| 摘要 |
PROBLEM TO BE SOLVED: To provide an organic EL element with high light emission efficiency and excellent durability. SOLUTION: The organic electroluminescent element includes at least one organic layer having a luminescent layer between a pair of electrodes. A layer containing an organic compound represented by general formula (A) is formed between the luminescent layer and a negative electrode, and the luminescent layer contains at least one type of electron transport material, and at least one type of hole transport material. At least one of the electron transport material and hole transport material is a luminescent material. Concentration of the hole transport material in the luminescent layer is reduced in a direction from a positive electrode to the negative electrode. R<SP>31</SP>-R<SP>36</SP>in the general formula (A) are hydrogen atoms or substituent groups. COPYRIGHT: (C)2009,JPO&INPIT
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