Increased emission efficiency in organic light-emitting devices on high-index substrates
First Claim
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1. A device, comprising:
- (a) a substrate having a first index of refraction;
(b) a first electrode disposed over the substrate;
(c) an organic emissive layer disposed over the first electrode, the organic emissive layer comprising a small molecule organic material having a second index of refraction; and
(d) a second electrode disposed over the organic emissive layer;
(e) wherein the first index of refraction is higher than the second index of refraction.
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Abstract
A device is provided. The device includes a substrate, a first electrode disposed over the substrate, a small molecule organic emissive layer disposed over the first electrode, and a second electrode disposed over the organic emissive layer. The substrate has a first index of refraction, and the organic emissive layer has a second index of refraction. The first index of refraction is higher than the second index of refraction. The device may have an external electroluminescent efficiency of at least about 56%. Bulky substituents or dopants may be used to decrease the index of refraction and/or the density of the organic emissive layer.
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Citations
24 Claims
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1. A device, comprising:
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(a) a substrate having a first index of refraction;
(b) a first electrode disposed over the substrate;
(c) an organic emissive layer disposed over the first electrode, the organic emissive layer comprising a small molecule organic material having a second index of refraction; and
(d) a second electrode disposed over the organic emissive layer;
(e) wherein the first index of refraction is higher than the second index of refraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An organic light emitting device, comprising:
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a substrate;
a first electrode disposed over the substrate, the first electrode having a thickness of at least 120 nm;
an organic emissive layer disposed over the first electrode; and
a second electrode disposed over the organic emissive layer;
wherein all of the organic layers in the device have a combined thickness of at least 140 nm; and
wherein the device has an external electroluminescent efficiency of at least 56%.
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13. A device, comprising:
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(a) a substrate having a first index of refraction, the first index of refraction being at most 1.51;
(b) a first electrode disposed over the substrate (c) an organic emissive layer disposed over the first electrode, the organic emissive layer comprising a small molecule organic material having a second index of refraction; and
(d) a second electrode disposed over the organic emissive layer;
(e) wherein the first index of refraction is higher than the second index of refraction. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An organic light emitting device, comprising:
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a substrate;
a first electrode disposed over the substrate;
a small molecule organic emissive layer disposed over the first electrode, the organic emissive layer including a material including a bulky substituent or a bulky dopant. a second electrode disposed over the organic emissive layer.
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Specification