有機エレクトロルミネッセンス素子

Organic electroluminescent element

Abstract

(57)【要約】 【課題】 長寿命で、発光効率が高い有機エレクトロル ミネッセンス素子(有機EL素子)を提供すること。 【解決手段】 少なくとも有機発光層を有する有機化合 物層が陽極と陰極からなる一対の電極の間に挾持され、 該有機発光層が、2層以上の層からなるとともに、これ らの有機発光層のすべてに同一種または同一色の蛍光性 物質がドーピングされてなる有機EL素子。
PROBLEM TO BE SOLVED: To realize an organic electroluminescent element having a long lifetime and a high light emitting efficiency by forming an organic light emitting layer of plural layers, and doping the all organic light emitting layers with the same kind or same color fluorescent material as a material for forming an organic light emitting layer. SOLUTION: In an organic EL element, plural organic light emitting layers, which are respectively formed of an organic host material and a fluorescent material, are provided. As this organic host material, a material, which has a function for injecting hole and electron and for transporting hole and electron and for recombining them so as to emit the fluorescence is used, and a material having electron affinity at 2.8-3.1eV on a point of electron injection property is desirable so as to prolong the lifetime. Ionizing potential of this host material is desirable set in a range at 5.4-6.0eV so as to prolong the lifetime. At this stage, electron affinity corresponds to an energy difference between the vacuum level and the conductive level of the host material, and ionizing potential corresponds to an energy difference between the vacuum level and valence electron level of the host material.

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