| 简介 |
PROBLEM TO BE SOLVED : To provide a low driving voltage and highly efficient organic EL element at low costs by providing a light emission layer made of an organic compound between opposing positive and negative electrodes and an organic compound layer doped with metal oxide or metallic salt in a boundary with the negative electrode. SOLUTION : An organic EL element is provided by sequentially stacking a transparent substrate 1 made of glass or the like, a positive transparent electrode 2, a hole transport layer 3, a light emission layer 4 made of a organic compound, a metal doping layer 5 and a negative backside electrode 6. The metal doping layer 5 is obtained by doping an organic compound with metal oxide or metallic salt in a boundary with the negative electrode 6. For this oxide or salt metal, alkaline metal such as Li, alkaline earth metal such as Mg or transition metal containing rare earth metal is preferred. Also, for the doping layer 5 doped with this metal, preferably, dopant concentration is set to 0.1 to 99 wt.% and a thickness is set to 10 to 2000 Å. Thus, the energy barrier of electron injection from the negative electrode to the organic compound layer is reduced and thereby a low driving voltage is realized. |
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