Organic electroluminescent devices with enhanced light extraction
AssigneeGeneral Electric Company
InventorsAnil Raj Duggal, Lionel Monty Levinson, Joseph John Shiang
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Abstract
An organic light emitting diode containing a first electrode, a second electrode, at least one organic light emitting layer, and an output coupler which reduces a Fresnel loss is provided. The index of refraction of the output coupler is matched to that of the adjacent layer of the device. The output coupler may be a dimpled transparent material or a composite layer containing light scattering particles to also reduce a critical angle loss.
Claims41
An organic electroluminescent light emitting device, comprising:
- a first electrode;
- a second electrode;
- at least one organic light emitting layer;
- and
- an output coupler which reduces a Fresnel loss.
An organic electroluminescent light emitting device, comprising:
- a first electrode;
- at least one organic light emitting layer over the first electrode;
- a second transparent electrode over the at least one organic light emitting layer;
- and
- a shaped transparent material which has corrugated or dimpled light emitting surface and which contains nanoparticles having a size of less than 100 nm over the second transparent electrode.
An organic electroluminescent light emitting device, comprising:
- a first electrode;
- at least one organic light emitting layer over the first electrode;
- a second transparent electrode over the at least one organic light emitting layer;
- and
- a matrix material containing light scattering particles over the second electrode.
A method of making an organic electroluminescent light emitting device, comprising:
- placing a first material into a mold cavity;
- solidifying the first material to form a shaped transparent material having corrugated or dimpled first light emitting surface;
- and
- attaching the shaped transparent material to the an organic electroluminescent light emitting device.
An organic electroluminescent light emitting device, comprising:
- a first electrode;
- at least one organic light emitting layer over the first electrode;
- a second transparent electrode over the at least one organic light emitting layer;
- and
- a shaped transparent material whose index of refraction is selected to match that of an adjacent layer of the light emitting device.
Dependencies are inferred from the claim text.