| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an organic electroluminescent element provided with an effective positive electrode structure on the lower surface side for effectively extracting light from a negative electrode on the upper surface side. SOLUTION: This organic electroluminescent element comprises a positive electrode A, a negative electrode K and an organic layer 10 retained between them. The organic layer 10 includes an organic luminescent layer 103 for emitting light by the recombination of positive holes fed from the positive electrode A with electrons fed from the negative electrode K. The negative electrode K has a laminated structure of an extremely thin electron injection metal layer 11 and a transparent conductive layer 12, and is basically light-transmissive. The positive electrode A contains a metal belonging to the five or six group of the periodic table in at least a part abutting on the organic layer 10 and is basically light-reflective. The positive electrode metal is selected from chromium, molybdenum, tungsten, tantalum or niobium. The work function of the positive electrode metal is less than 4.8 eV.</p> |
