Top-emission organic light-emitting devices with microlens arrays
First Claim
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1. An organic light-emitting device, comprising:
- a substrate;
at least one light emission layer, wherein the at least one light emission layer comprises at least one organic material;
a reflecting electrode positioned between the substrate and the at least one light emission layer;
a microlens array; and
a transparent electrode positioned between the microlens array and the at least one light emission layer,wherein the microlens array is positioned on an emitting surface of the organic light-emitting device, wherein the emitting surface is an outer surface of the transparent electrode, wherein the microlens array increases the outcoupling efficiency of light out of the device, wherein the index of refraction of the microlens array is greater than or equal to the index of refraction of the at least one light emission layer.
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Abstract
Embodiments of the invention can provide organic light-emitting devices (OLEDs) with enhanced outcoupling efficiency. Specific embodiments can enhance the outcoupling efficiency by more than four times. Embodiments of the invention incorporate microlens 5 arrays on the emitting surface of a top-emission OLED. Incorporation of microlens arrays on the emitting surface of a top-emission OLED can greatly enhance the outcoupling efficiency in OLEDs. With a microlens array attached to the emitting surface, much of, if not all, of the waveguiding modes can be extracted. The microlens array can be fabricated using the inkjet printing method or using other methods, including molding.
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Citations
22 Claims
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1. An organic light-emitting device, comprising:
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a substrate; at least one light emission layer, wherein the at least one light emission layer comprises at least one organic material; a reflecting electrode positioned between the substrate and the at least one light emission layer; a microlens array; and a transparent electrode positioned between the microlens array and the at least one light emission layer, wherein the microlens array is positioned on an emitting surface of the organic light-emitting device, wherein the emitting surface is an outer surface of the transparent electrode, wherein the microlens array increases the outcoupling efficiency of light out of the device, wherein the index of refraction of the microlens array is greater than or equal to the index of refraction of the at least one light emission layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An organic light-emitting device, comprising:
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a substrate; at least one light emission layer, wherein the at least one light emission layer comprises at least one organic material; a reflecting electrode positioned between the substrate and the at least one light emission layer; a microlens array; a transparent electrode positioned between the microlens array and the at least one light emission layer; and a dielectric layer positioned between the microlens array and the transparent electrode, wherein the dielectric layer reduces the passing of oxygen and moisture from the environment to the transparent electrode, wherein the microlens array is positioned on an emitting surface of the organic light-emitting device, wherein the emitting surface is an outer surface of the dielectric layer, wherein the microlens array increases the outcoupling efficiency of light out of the device, wherein the index of refraction of the microlens array is greater than or equal to the index of refraction of the at least one light emission layer.
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Specification