Inorganic hosts in OLEDs
First Claim
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1. A first device comprising a first organic light emitting device, the first organic light emitting device comprising:
- an anode;
a cathode; and
an emissive layer, disposed between the anode and the cathode, the emissive layer comprising;
a first host comprising at least 70 wt % non-emitting inorganic material; and
a first phosphorescent emissive dopant;
wherein the first host has an energy band gap of less than 4 eV, wherein the inorganic material and the first phosphorescent emissive dopant are not attached, wherein the first host in the emissive layer is at least 50 wt % of the emissive layer.
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Abstract
A novel electronic device is reported containing a host comprising an inorganic material with a band gap of less than 4 eV. The use of an inorganic material is advantageous due to its desirable physical properties, including increased stability and charge mobility.
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Citations
20 Claims
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1. A first device comprising a first organic light emitting device, the first organic light emitting device comprising:
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an anode; a cathode; and an emissive layer, disposed between the anode and the cathode, the emissive layer comprising; a first host comprising at least 70 wt % non-emitting inorganic material; and a first phosphorescent emissive dopant;
wherein the first host has an energy band gap of less than 4 eV, wherein the inorganic material and the first phosphorescent emissive dopant are not attached, wherein the first host in the emissive layer is at least 50 wt % of the emissive layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of making a first device comprising:
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depositing an anode layer on a substrate; depositing at least one emissive layer after the anode layer; and depositing a cathode layer after the at least one emissive layer;
wherein the at least one emissive layer contains a first host comprising at least 70 wt % non-emitting inorganic material and a first phosphorescent emissive dopant, wherein the inorganic material and the first phosphorescent emissive dopant are not attached;wherein the first host has an energy band gap of less than 4 eV, and wherein the first host in the emissive layer is at least 50 wt % of the emissive layer. - View Dependent Claims (18, 19, 20)
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Specification