Organic electroluminescent materials and devices
First Claim
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1. A device, comprisingan anode;
- a cathode; and
an organic emissive layer disposed between the anode and the cathode comprising;
a host;
a first compound capable of phosphorescent emission at room temperature present in an amount less than 3 weight %, the first compound having a global maximum in its visible emission spectrum at a first wavelength;
a second compound capable of phosphorescent emission at room temperature, the second compound having a global maximum in its visible emission spectrum at a second wavelength, the first wavelength longer than the second wavelength;
wherein the first compound, the second compound and the host are mixed in the emissive layer; and
a suppression mechanism capable of preferentially reducing emission of light emitted by the second compound;
wherein the difference between the first wavelength and the second wavelength is between 0 nm and 80 nm.
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Abstract
An OLED includes a suppression mechanism and multiple dopants in its organic emissive layer. The organic emissive layer includes a host, a first compound capable of phosphorescent emission at room temperature, and a second compound capable of phosphorescent emission at room temperature. The suppression mechanism is capable of preferentially reducing the emission of light emitted by the second compound. The organic emissive layer may also contain a third compound capable of phosphorescent emission at room temperature.
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Citations
18 Claims
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1. A device, comprising
an anode; -
a cathode; and an organic emissive layer disposed between the anode and the cathode comprising; a host; a first compound capable of phosphorescent emission at room temperature present in an amount less than 3 weight %, the first compound having a global maximum in its visible emission spectrum at a first wavelength; a second compound capable of phosphorescent emission at room temperature, the second compound having a global maximum in its visible emission spectrum at a second wavelength, the first wavelength longer than the second wavelength; wherein the first compound, the second compound and the host are mixed in the emissive layer; and a suppression mechanism capable of preferentially reducing emission of light emitted by the second compound; wherein the difference between the first wavelength and the second wavelength is between 0 nm and 80 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A device, comprising:
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an anode; a cathode; and an organic light emission layer disposed between the anode and the cathode comprising; a host; a first compound capable of phosphorescent emission at room temperature present in an amount less than 3 weight %, the first compound having a having a global maximum in its visible emission spectrum at a first wavelength; a second compound capable of phosphorescent emission at room temperature, the second compound having a global maximum in its visible emission spectrum at a second wavelength, the first wavelength longer than the second wavelength; a third compound capable of phosphorescent emission at room temperature, the third compound having a global maximum in its visible emission spectrum at a third wavelength, the second wavelength longer than the third wavelength; wherein the first compound, the second compound, the third compound and the host are mixed in the emissive layer; and a suppression mechanism capable of preferentially reducing emission of light emitted by the second compound and the third compound.
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18. A device, comprising
an anode; -
a cathode; and an organic light emission layer disposed between the anode and the cathode comprising; a host; a first compound capable of phosphorescent emission at room temperature present in an amount less than 3 weight %, the first compound having a global maximum in its visible emission spectrum at a first wavelength; a second compound capable of phosphorescent emission at room temperature, the second compound having a global maximum in its visible emission spectrum at a second wavelength, the first wavelength longer than the second wavelength; wherein the first compound, the second compound and the host are mixed in the emissive layer; and a suppression mechanism capable of preferentially reducing emission of light emitted by the second compound; wherein the difference between the first wavelength and the second wavelength is between 40 and 80 nm.
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Specification