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US 6,703,780 B2Granted
Organic electroluminescent device with a ceramic output coupler and method of making the same
AssigneeGeneral Electric Company
InventorsJoseph John Shiang, Anil Raj Duggal
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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 a ceramic output coupler is provided. The index of refraction of the output coupler is matched to that of the adjacent layer of the device. The ceramic output coupler may be a ceramic substrate with a dimpled light emitting surface which reduces Fresnel and critical angle optical losses.
Claims31
An organic electroluminescent light emitting device, comprising:
- a first electrode;
- a second electrode;
- at least one organic light emitting layer;
- and
- a ceramic output coupler;
- wherein the device comprises an organic light emitting diode, the ceramic coupler comprises a ceramic layer containing a light emitting surface of the device and comprises a shaped translucent ceramic material attached to the organic light emitting diode, the light emitting surface has dimples or corrugations, which have a sinusoidal, pseudo-pyramidal or conical shape, and each dimple or corrugation has a height greater than 0.1 micron and a spacing between dimple or corrugation peaks is a factor of 10 or less of the dimple or corrugation height.
3 more elements
An organic electroluminescent light emitting device, comprising:
- a first electrode;
- a second electrode;
- at least one organic light emitting layer;
- and
- a ceramic output coupler;
- wherein the device comprises an organic light emitting diode;
- the ceramic coupler comprises a ceramic layer containing a light emitting surface of the device;
- and the ceramic output coupler comprises a first ceramic layer having a first index of refraction that is matched to an index of refraction of an adjacent layer of the electroluminescent device, and a second ceramic layer having a second index of refraction lower than the first index of refraction.
5 more elements
An organic electroluminescent light emitting device, comprising:
- a first electrode;
- a second electrode;
- at least one organic light emitting layer;
- and
- a ceramic output coupler;
- wherein the device comprises an organic light emitting diode, the ceramic coupler comprises a ceramic layer containing a light emitting surface of the device, and the ceramic output coupler comprises a ceramic layer having a graded index of refraction, wherein an inner portion of the layer has a first index of refraction that is matched to an index of refraction of an adjacent layer of the electroluminescent device and an outer portion of the layer has a second index of refraction that is lower than the first index of refraction.
3 more elements
An organic electroluminescent light emitting device, comprising:
- a first electrode;
- a second electrode;
- at least one organic light emitting layer;
- a voltage source electrically coupled to the first and second electrodes;
- and
- a ceramic output coupler;
- wherein the device comprises an organic light emitting diode, the ceramic coupler comprises a ceramic layer containing a light emitting surface of the device, the electroluminescent device emits white light, the first electrode comprises a metal containing electrode, the organic light emitting layer comprises at least one an organic molecule layer or at least one polymer layer over a first side of the first electrode, and the second electrode comprises a transparent electrode having a first side over the organic light emitting layer.
4 more elements
An organic electroluminescent light emitting device, comprising:
- a first electrode;
- a second electrode;
- at least one organic light emitting layer;
- and
- a ceramic output coupler;
- wherein the device comprises an organic light emitting diode, the ceramic coupler comprises a ceramic layer containing a light emitting surface of the device, and the ceramic output coupler comprises a first ceramic material having surface recesses at grain boundaries and a second ceramic material in the recesses between the first ceramic material and an adjacent layer of the device.
3 more elements
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 ceramic material over the second transparent electrode, wherein:
- the shaped ceramic material contains a corrugated or dimpled light emitting surface and voids throughout its volume which scatter light emitted by the organic light emitting layer;
- and an index of refraction of the shaped ceramic material is matched to an index of refraction of an adjacent layer of the electroluminescent device.
4 more elements
A method of making an organic electroluminescent light emitting device, comprising:
- forming a first electrode;
- forming at least one organic light emitting layer;
- forming a second electrode;
- and
- forming a ceramic output coupler;
- wherein the step of forming the ceramic output coupler comprises:
- placing a ceramic precursor material into a mold cavity;
- solidifying the precursor material to form a shaped ceramic output coupler having a corrugated or dimpled first light emitting surface;
- and
- attaching the output coupler to the organic electroluminescent light emitting device.
7 more elements
A method of making an organic electroluminescent light emitting device, comprising:
- forming a first electrode;
- forming at least one organic light emitting layer;
- forming a second electrode;
- and
- forming a ceramic output coupler;
- wherein the ceramic output coupler comprises a ceramic phosphor or a ceramic matrix material containing light emitting particles.
3 more elements
A method of making an organic electroluminescent light emitting device, comprising:
- forming a first electrode;
- forming at least one organic light emitting layer;
- forming a second electrode;
- and
- forming a ceramic output coupler;
- wherein the ceramic output coupler comprises:
- a first ceramic layer having a first index of refraction that is matched to an index of refraction of an adjacent layer of the electroluminescent device;
- and
- a second ceramic layer having a second index of refraction lower than the first index of refraction.
6 more elements
A method of making an organic electroluminescent light emitting device, comprising:
- forming a first electrode;
- forming at least one organic light emitting layer;
- forming a second electrode;
- and
- forming a ceramic output coupler;
- wherein the method further comprises forming a second ceramic material in surface recesses at grain boundaries of the ceramic output coupler by a sol-gel method.
3 more elements
A method of making an organic electroluminescent light emitting device, comprising:
- forming a first electrode;
- forming at least one organic light emitting layer;
- forming a second electrode;
- and
- forming a ceramic output coupler;
- wherein the method further comprises:
- forming a glass plate over the first electrode;
- forming a metal coating over the glass plate;
- and
- attaching the organic electroluminescent light emitting device to a mounting substrate.
7 more elements
Dependencies are inferred from the claim text.