Organic electroluminescent element
An electroluminescent element and luminescent technology, applied in the direction of electroluminescent light source, electrical components, electric light source, etc., can solve the problems of shortened lifespan and achieve the effect of low driving voltage
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no. 1 Embodiment approach
[0197] The organic EL element of the present invention has, for example, an element configuration having at least one light-emitting layer. A specific configuration is shown below, for example.
[0198] (1) Anode / luminescent layer / electron injection / transport layer / cathode
[0199] (2) Anode / hole injection layer / light emitting layer / electron injection / transport layer / cathode
[0200] (3) Anode / hole injection layer / hole transport layer / light emitting layer / electron injection / transport layer / cathode
[0201] Usually, the structure (3) is preferably used among the above-mentioned layer structures, but it is not limited thereto.
no. 2 Embodiment approach
[0203] The organic EL element of the present invention has, for example, a tandem element configuration having at least two light emitting layers (units containing light emitting layers). The so-called tandem element configuration generally includes a first light-emitting unit, a second light-emitting unit, and a charge generation layer (CGL) sandwiched between the light-emitting units. Here, the light-emitting unit has at least a hole transport layer, a light-emitting layer, and an electron-transport layer in this order, and the first organic layer in the present invention corresponds to the light-emitting layer, and the second organic layer corresponds to the electron-transport layer.
[0204] It should be noted that the light-emitting layer included in each light-emitting unit may be formed of a single layer, or may be laminated.
[0205] The first organic layer in the present invention may be contained in the first light-emitting unit, or may be contained in the second lig...
no. 3 Embodiment approach
[0212] The organic EL element of the present invention has an anode, a plurality of light-emitting layers, an electron injection / transport layer, and a cathode in sequence, a charge barrier layer is provided between any two light-emitting layers of the plurality of light-emitting layers, and the light emitting layer connected to the charge barrier layer The layer is a fluorescent light emitting layer, the fluorescent light emitting layer corresponds to the first organic layer, and the electron injection / transport layer corresponds to the second organic layer.
[0213] As a preferable organic EL device configuration of the third embodiment, as described in Japanese Patent No. 4134280, U.S. Laid-Open Patent Publication US2007 / 0273270A1, and International Laid-Open Publication WO2008 / 023623A1, an anode, a first light-emitting layer, and an anode are sequentially stacked. In the structure obtained by the charge barrier layer, the second light-emitting layer, and the cathode, there ...
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