Organic electroluminescent device, liquid crystal display and illuminating device
View Patent ↗This invention provides an organic electroluminescent element that has a thin and compact sealing structure and is excellent in heat resistance in sealing, particularly a high-brightness organic electroluminescent element comprising a phosphorescence emitting substance, and a liquid crystal display device and lighting equipment using the same. The organic electroluminescent element comprises a substrate and a first electrode, one or more organic layers including a luminescent layer, and a second electrode provided on the substrate. An adhesive layer is disposed on the whole area of a light emitting surface and remote from the light takeout side in the organic electroluminescent element, and a flexible film having a barrier film is applied thereto to form the light emitting surface. The organic electroluminescent element is characterized in that at least one of the luminescent material contained in the luminescent layer is phosphorescence emitting substance, and not less than 80% by mass of the organic material constituting the organic layer has a glass transition temperature of 100° C. or above.
1. A white light emitting organic EL device comprising a substrate;
a first electrode on the substrate;
one or more organic layers on the first electrode, the one or more organic layers including a light emission layer unit comprising a blue light emission layer, a green light emission layer, and a red light emission layer, superposed on each other;
a second electrode on the organic layers;
an adhesive layer on the second electrode, the adhesive layer extending to the substrate; and
a flexible film having a barrier layer on a top surface of the adhesive layer;
wherein
light is admitted to the device at the flexible film and exits at the substrate;
a phosphorescence light emission material is in the light emission laver; and
80% by mass or more of the organic layer is an organic material having a glass transition point, of 100° C. or higher.
2. The white light emitting organic EL device of claim 1 , wherein the light emission layer unit further comprises three light emission. materials each having an emission maximum wavelength of 440 to 490 nm, 500 to 540 nm and 600 to 640 nm, and at least two of them are each a phosphorescence light emission material.
3. The white light emitting organic EL device of claim 1 , wherein the substrate is a flexible film having an oxygen permeability of not more than 10 −1 ml/m 2 ·24 h MPa and a water vapor permeability of not more than 10 −3 g/m 2 ·24 h.
4. The white light emitting organic EL device of claim 1 , which further has an inorganic layer having oxygen permeability not more than 10 −1 ml/m 2 ·24 h and water vapor permeability not more than 10 −3 g/m 2 ·24 h·MPa between the organic layer which is not covered with the second electrode and the adhesion layer.
5. A liquid crystal display which bag the white light emitting organic EL device of claim 1 , as a backlight.
6. An illuminating device which has the white light emitting organic EL device of claim 1 , as a light source.
7. The white light emitting organic EL device of claim 1 , wherein a total thickness of the blue light emission layer, the green light emission layer and the red light emission layer not more than 30 nm.
8. The white light emitting organic EL device of claim 1 , wherein a thickness of each of the blue light emission layer, the green light emission layer and the red light emission layer is 2 to 25 nm.
9. The white light emitting organic EL device of claim 1 , wherein the blue light emission layer, a green light emission layer and red light emission layer have an emission maximum wavelength of 440 to 490 nm, 500 to 340 nm, and 600 to 640 nm, respectively.