| 摘要 |
PROBLEM TO BE SOLVED: To provide an organic light-emitting element capable of exhibiting white light-emission having high efficiency/high quality in the organic light-emitting element combined with a light-emitting layer to exhibit phosphorescent light-emission. SOLUTION: This organic light-emitting element is formed by having a light-emitting layer 3 between an anode 1 and a cathode 2. Light-emitting layers 3a, 3b, 3c having three or more layers for emitting light at least at two different wavelengths are provided by stacking them on each other, and the light-emitting layer to exhibit a long wavelength light-emission is formed into a laminated configuration pinched by the light-emitting layer to exhibit a short wavelength light-emission. A host material to constitute the light-emitting layer of the long wavelength light-emission is the same as that constituting the light-emitting layer of the short wavelength light-emission, and compounds showing light-emission from the spin multiplet term are added to the respective light-emitting layers as a dopant. The compound to increase electron transport properties of the light-emitting layer is added to at least a part of the light-emitting layer as the dopant. COPYRIGHT: (C)2008,JPO&INPIT
|
