Organic electroluminescent light source
AssigneeKoninklijke Philips Electronics N.V.
InventorHerbert Friedrich Boerner
Life of this patent
Estimating the term…
Abstract
An electroluminescent light source includes a substrate and a layer structure applied to the substrate for emitting light at least on the side facing away from the substrate. The layer structure includes an electroluminescent layer between two electrodes. A partially transparent encapsulation device forms a closed volume around the layer structure, and is filled with a dielectric fluid which is substantially chemically inert with respect to the layer structure. The fluid contains particles for absorbing parts of the light emitted by the layer structure and for re-emitting light of a different wavelength. The density of the particles is selected such that the particles in the dielectric fluid are in the suspended state in the operational state of the light source.
Claims20
An electroluminescent light source comprising:
- a substrate,
- a layer structure applied to the substrate for emitting light at least on the side facing away from the substrate, said layer structure comprising at least one electrode as anode, at least one electrode as cathode and at least one organic electroluminescent layer located therebetween, wherein one of the anode and cathode is at least partially transparent and is on a side facing away from the substrate, and
- an at least partially transparent encapsulation device having a peripheral edge which is glued to the layer structure for forming a closed volume around the layer structure, wherein the closed volume defines an empty space surrounded by the peripheral edge, the closed volume being filled with a liquid including a dielectric fluid which is substantially chemically inert with respect to the layer structure, said fluid containing particles for absorbing parts of the light emitted by the layer structure and for re-emitting light of a different wavelength, a density of said particles being selected such that the particles in the dielectric fluid are in a suspended state in an operational state during use of the electroluminescent light source for providing the light.
A method of producing an electroluminescent light source comprising the acts of:
- forming a layer structure for emitting light over a substrate, the layer structure comprising at least one organic electroluminescent layer located between two electrodes;
- forming an at least partially transparent encapsulation device having a peripheral edge;
- gluing the peripheral edge to the layer structure to form a closed volume around the layer structure, the closed volume defining an empty space surrounded by the peripheral edge;
- and
- filling the closed volume of the encapsulation device with a dielectric fluid which is substantially chemically inert with respect to the layer structure, said dielectric fluid containing particles for absorbing parts of the light emitted by the layer structure and for re-emitting light of a different wavelength, a density of said particles being selected such that the particles in the dielectric fluid are in a suspended state in an operational state during use of the electroluminescent light source for providing the light.
Dependencies are inferred from the claim text.