Low image sticking OLED display
First Claim
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1. A device comprising:
- a plurality of OLEDs;
a first capping layer disposed over a first portion of the plurality of OLEDs, including a first OLED, and coupled to the first portion of the plurality of OLEDs, and a second capping layer disposed over a second portion of the plurality of OLEDs and optically coupled to the second portion of the plurality of OLEDs, but not optically coupled to the first plurality of OLEDs;
wherein;
the first OLED of the plurality of OLEDs is a blue OLED that has a first peak emission wavelength, and comprises a first transport layer, and a second OLED of the plurality of OLEDs has a second peak emission wavelength different from the first peak emission wavelength and comprises a second transport layer, wherein the first transport layer is a non-common layer among the first and second OLEDs, and the second transport layer is a non-common layer among the first and second OLEDs;
the blue OLED comprises a plurality of emissive layers, at least a first of the plurality of emissive layers comprising a first host material, a second host material, and an emissive material, wherein the HOMO of the second host material is between the HOMO of the first host material and the HOMO of the emissive material and the LUMO of the second host material is between the LUMO of the first host material and the LUMO of the emissive material;
the blue OLED comprises a transport layer disposed adjacent to the first emissive layer, wherein the transport layer comprises a material having a first triplet state having a higher energy level than a first triplet state of the emissive material; and
at least one of the plurality of OLEDs comprises an OLED of a different color than the blue OLED and comprises a single emissive layer.
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Abstract
Devices and fabrication methods thereof are provided which reduce image sticking and/or improve lifetime and performance of blue emissive devices. Each device may include non-common transport layers between emissive devices, one or more optical capping layers, light and deep blue emissive devices, a mixed host emissive layer, a high T1 transport layer, and/or a stacked blue device in conjunction with single emissive layer red and/or green devices. The provided structures may be used individually, in combination, or as a group in a single device.
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Citations
29 Claims
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1. A device comprising:
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a plurality of OLEDs; a first capping layer disposed over a first portion of the plurality of OLEDs, including a first OLED, and coupled to the first portion of the plurality of OLEDs, and a second capping layer disposed over a second portion of the plurality of OLEDs and optically coupled to the second portion of the plurality of OLEDs, but not optically coupled to the first plurality of OLEDs; wherein; the first OLED of the plurality of OLEDs is a blue OLED that has a first peak emission wavelength, and comprises a first transport layer, and a second OLED of the plurality of OLEDs has a second peak emission wavelength different from the first peak emission wavelength and comprises a second transport layer, wherein the first transport layer is a non-common layer among the first and second OLEDs, and the second transport layer is a non-common layer among the first and second OLEDs; the blue OLED comprises a plurality of emissive layers, at least a first of the plurality of emissive layers comprising a first host material, a second host material, and an emissive material, wherein the HOMO of the second host material is between the HOMO of the first host material and the HOMO of the emissive material and the LUMO of the second host material is between the LUMO of the first host material and the LUMO of the emissive material; the blue OLED comprises a transport layer disposed adjacent to the first emissive layer, wherein the transport layer comprises a material having a first triplet state having a higher energy level than a first triplet state of the emissive material; and at least one of the plurality of OLEDs comprises an OLED of a different color than the blue OLED and comprises a single emissive layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification