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US 12,652,901 B2Granted
Color stable organic light emitting diode stack
AssigneeUniversal Display Corporation
InventorsHitoshi Yamamoto, Xin Xu, Michael S. Weaver, Vadim Adamovich
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Abstract
The present invention relates to OLED devices and stacks for OLED devices that include a symmetric emissive-layer architecture. In one embodiment, the present invention relates to an emissive stack having three layers, wherein the top and bottom layers emit light in the same or similar color region while the middle layer emits light in a different color region than the other two layers. In such an embodiment, the three layers are in contact with each other with no other layers in between. The symmetric emissive-layer architecture of the present invention can be used to improve the color stability of OLED devices.
Claims20
An organic light emitting device, comprising:
- a first electrode;
- a first emissive layer disposed over the first electrode and comprising a first fluorescent blue emissive material;
- a first charge generation layer disposed over the first emissive layer;
- a second emissive layer disposed over the first charge generation layer and comprising a first red emissive material having a peak wavelength in the range 580-700 nm;
- a third emissive layer disposed over the second emissive layer and comprising a first green emissive material;
- a fourth emissive layer disposed over the third emissive layer and comprising a second red emissive material having a peak wavelength in the range 580-700 nm;
- a second charge generation layer disposed over the fourth emissive layer;
- and
- a fifth emissive layer disposed over the second charge generation layer and comprising a second fluorescent blue emissive material;
- wherein:
- no emissive layer disposed between the first electrode and the first charge generation layer includes a red emissive material having a peak wavelength in the range 580-700 nm;
- and
- no emissive layer disposed over the second charge generation layer includes a red emissive material having a peak wavelength in the range 580-700 nm.
10 more elements
An organic light emitting device, comprising:
- a substrate;
- a first electrode disposed over the substrate;
- a second electrode disposed over the first electrode;
- a first charge generation layer disposed between the first electrode and the second electrode;
- a second charge generation layer disposed over the first charge generation layer;
- a first emissive stack disposed between the first electrode and the second electrode, the first emissive stack comprising:
- a first emissive layer comprising a first green emissive material;
- a second emissive layer comprising a phosphorescent first blue emissive material;
- and
- a third emissive layer comprising a second green emissive material;
- a second emissive stack disposed between the first electrode and the second electrode, the second emissive stack comprising:
- a fourth emissive layer comprising a second blue emissive material;
- and
- a third emissive stack disposed between the first electrode and the second electrode, the third emissive stack comprising:
- a fifth emissive layer comprising a third blue emissive material;
- wherein each emissive stack is separated from any adjacent emissive stack by the first charge generation layer or the second charge generation layer;
- and
- wherein the second emissive stack and the third emissive stack exclude emissive layers comprising red emissive materials, each having a peak wavelength in the range 580-700 nm.
15 more elements
An organic light emitting device, comprising:
- a substrate;
- a first electrode disposed over the substrate;
- a second electrode disposed over the first electrode;
- a first charge generation layer disposed between the first electrode and the second electrode;
- a second charge generation layer disposed over the first charge generation layer;
- a third charge generation layer disposed over the second charge generation layer;
- a first emissive stack disposed between the first electrode and the second electrode, the first emissive stack comprising:
- a first emissive layer comprising a first red emissive material;
- a second emissive layer comprising a first green emissive material;
- and
- a third emissive layer comprising a second red emissive material;
- a second emissive stack disposed between the first electrode and the second electrode, the second emissive stack comprising:
- a fourth emissive layer comprising a first blue emissive material;
- and
- a third emissive stack disposed between the first electrode and the second electrode, the third emissive stack comprising:
- a fifth emissive layer comprising a second blue emissive material;
- and
- a fourth emissive stack disposed between the first electrode and the second electrode, the fourth emissive stack comprising:
- a sixth emissive layer comprising a third blue emissive material;
- wherein each emissive stack is separated from any adjacent emissive stack by the first charge generation layer, the second charge generation layer, or the third charge generation layer;
- and
- wherein at least two of the second emissive stack, the third emissive stack, and the fourth emissive stack exclude emissive layers comprising red emissive materials having a peak wavelength in the range 580-700 nm.
19 more elements
Dependencies are inferred from the claim text.