Organic light-emitting device and use of a transparent electroconductive layer in an organic light-emitting device
AssigneeSaint-Gobain Glass France
InventorsSvetoslav Tchakarov, Didier Jousse
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Abstract
The invention relates to an organic light-emitting device comprising: a substrate, especially a transparent substrate; a first electrode and a second electrode on one and the same face of the substrate, at least the first electrode being semitransparent or transparent; and an electroluminescent layer sandwiched between the first and second electrodes, characterized in that the first electrode comprises a diffusing electroconductive layer having a haze of 2% or higher. The invention also relates to the use of a diffusing electroconductive layer having a haze of 2% or higher as electrode closest to the substrate of an organic light-emitting device.
Claims29
An organic light-emitting device comprising:
- a substrate, especially a transparent substrate;
- a first electrode and a second electrode on one and the same face of the substrate, at least the first electrode being semitransparent or transparent;
- and
- an electroluminescent layer sandwiched between the first and second electrodes,
- characterized in that the first electrode comprises a diffusing electroconductive layer having a haze of 2% or higher.
The light-emitting device as claimed in either of the preceding claims, characterized in that the first electrode possesses a factor formed from the product of the haze (H) multiplied by the light transmission (TL) expressed in a graph of H(TL) which is above a line defined by the following bi-points:
- (15,82);
- (10,84);
- (6,85).
The light-emitting device according to one of the preceding claims, characterized in that the first electrode possesses a light absorption×electrical surface resistance product of less than 0.6 Ω/□.
The light-emitting device as claimed in one of the preceding claims, characterized in that the first electrode has a resistance per square (R) equal to or less than 15Ω/□, especially equal to or less than 12Ω/□ and preferably equal to or less than 10 or 12 Ω/□.
The light-emitting device as claimed in one of the preceding claims, characterized in that the diffusing electroconductive layer is on the side where the light emitted by the device is output.
The light-emitting device as claimed in one of the preceding claims, characterized in that the substrate is transparent, the first electrode is closest to the substrate and preferably the second electrode is diffusing, especially through a roughness induced by the diffusing electroconductive layer.
The light-emitting device as claimed in one of the preceding claims, characterized in that the diffusing electroconductive layer is made of a predominantly crystalline doped metal oxide.
The light-emitting device as claimed in one of the preceding claims, characterized in that the diffusing electroconductive layer is a layer having a diffusing surface directly after deposition.
The light-emitting device as claimed in one of the preceding claims, characterized in that the surface of the diffusing electroconductive layer is rough, with features larger in size than 50 nm.
The light-emitting device as claimed in one of the preceding claims, characterized in that the diffusing electroconductive layer is a multilayer that includes a first electroconductive layer made of an undoped mineral oxide, said first layer being coated with a second electroconductive layer made of the same mineral oxide, said mineral oxide however being doped.
The light-emitting device as claimed in one of the preceding claims, characterized in that it is provided with at least one barrier layer, especially one forming a barrier to alkali metals, which is inserted between said chosen glass substrate and the electrode closest to the glass substrate.
The light-emitting device as claimed in any one of the preceding claims, characterized in that the first electrode is based on a doped and/or undoped mineral oxide deposited by pyrolysis, especially in the gas phase, on the electroluminescent layer, and the second electrode is metallic.
The light-emitting device as claimed in any one of the preceding claims, characterized in that the substrate is a preferably extra-clear glass.
The light-emitting device as claimed in any one of the preceding claims, characterized in that one of the faces of the substrate is coated with a stack providing a functionality of the anti-reflection or hydrophobic or photocatalytic or solar control or low emissivity (low-E) type.
The light-emitting device as claimed in any one of the preceding claims, characterized in that it forms a lighting, decorative, architectural or indicating system or a display panel, is intended for buildings, thus forming an illuminating façade, an illuminating window, or is intended for a transport vehicle, such as a rear window, a side window or a sunroof of a motor vehicle, or for any other terrestrial, aquatic or airborne vehicle, is intended for urban furniture, such as a bus shelter, for a showcase, for a jewelry shelf, for a shop window, a shelf element, for an aquarium or for a greenhouse, or is intended for interior furnishing, for a mirror, for furniture or for electrically controllable glazing.
The use of a transparent diffusing electro-conductive layer having a haze of 2% or higher as layer of the electrode closest to the substrate of an organic light-emitting device.
The use of a diffusing electroconductive layer as claimed in the preceding claim, characterized in that the diffusing electroconductive layer is a multilayer that includes a first transparent electroconductive layer made of an undoped mineral oxide, said first layer being coated with a second transparent electro-conductive layer made of the same mineral oxide, said mineral oxide being doped, however, and preferably the first layer is based on tin oxide (SnO2) and the second layer is based on fluorine-doped tin oxide (SnO2:F), or the first layer is based on zinc oxide (ZnO) and the second layer is based on aluminum-doped zinc oxide (ZnO:Al).
Dependencies are inferred from the claim text.