Organic EL devices
The present organic EL devices have at least one luminescent layer and a cathode sequentially provided on their anode, which luminescent layer contains an electron-transporting material, a hole-transporting material, and a luminescent dopant. Preferably, an electron-transporting layer is further provided between the luminescent layer and the cathode. According to the present invention, organic EL devices can be provided giving improved whiteness, colour reproducibility, luminescent efficiency, and lifetime compared to conventional ones.
1. An organic EL device having at least a red luminescent layer, a blue luminescent layer, a green luminescent layer, and a cathode sequentially provided on an anode in this order wherein the red luminescent layer contains only a red luminescent dopant as a luminescent dopant, the blue luminescent layer contains only a blue luminescent dopant as a luminescent dopant, the green luminescent layer contains only a green luminescent dopant as a luminescent dopant, the blue luminescent dopant and the green luminescent dopant contain at least one common derivative, and the common derivative is selected from the group consisting of metal-quinolinolate complexes, pyrene derivatives, perylene derivatives, distyrylamine derivatives, anthracene derivatives, silole derivatives and triphenylamine derivatives.
2. An organic EL device of claim 1 wherein an electron-transporting layer is further provided between the green luminescent layer and the cathode.
3. An organic EL device of claim 1 wherein a blocking layer is further provided between the red luminescent layer and the blue luminescent layer.
4. An organic EL device of claim 2 wherein the electron-transporting layer consists of one layer.
5. An organic EL device of claim 2 wherein the electron-transporting layer consists of two electron-transporting layers.
6. An organic EL device of claim 5 wherein of the two electron-transporting layers, the electron-transporting layer nearer to the anode is made of aluminium tris(8-quinolinolate) and the electron-transporting layer nearer to the cathode is made of a phenanthroline derivative or a triphenylmethane derivative.
7. An organic EL device of claim 2 wherein the electron-transporting layer is a mixture layer made of a plurality of derivatives.
8. An organic EL device of claim 4 wherein the electron-transporting layer contains at least one metal complex.
9. An organic EL device of claim 1 containing a phosphorescent material.