| 摘要 |
PROBLEM TO BE SOLVED: To provide an organic electroluminescent element of which the lifetime can be extended by improving an electron transport layer. SOLUTION: The organic electroluminescent element has an organic luminous layer 3 and an electron transport layer 5 formed by containing an electroluminescent dopant in a host material between two opposing electrodes 1, 2. A mixed layer 6 is provided at a part at least in contact with the organic luminous layer 3 in the electron transport layer 5, where the mixed layer 6 is made by mixing a main constituent for composing the electron transport layer 5, the host material of the organic luminous layer 3, and an organic semiconductor material that has ionization potential not more than the ionization potential of the main constituent for composing the electron transport layer 5 and differs from the host material of the organic luminous layer 3. The contribution rate of the organic semiconductor material mixed to the mixed layer 6 to the emission of light is not more than 5%. COPYRIGHT: (C)2008,JPO&INPIT
|
