Annealed organic light emitting devices and methods of annealing organic light emitting devices
AssigneeXerox Corporation
InventorsHany M. Aziz, Zoran D. Popovic, Nan-Xing Hu
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Abstract
Organic light emitting devices includes a light emission region between a cathode and anode. The light emission region comprises an organic light emitting material. The organic light emitting devices are formed by annealing as-fabricated devices. The annealing improves the performance of the as-fabricated devices, by decreasing their operating voltage and increasing their energy conversion efficiency. Multiple organic light emitting devices can be annealed to make the properties of the devices more uniform relative to each other.
Claims19
A method of treating an organic light emitting device, comprising:
- providing an as-fabricated organic light emitting device, comprising:
- an anode;
- a cathode;
- and
- a light emission region that emits light between the anode and cathode, the light emission region including an organic light emitting material;
- and
- annealing the as-fabricated organic light emitting device at an annealing temperature from about 50° C. and below 100° C. and for an annealing period effective to (i) decrease an operating voltage of the as-fabricated organic light emitting device, and (ii) increase an energy conversion efficiency of the as-fabricated organic light emitting device;
- wherein the annealing temperature is below a glass transition temperature of a material of the organic light emitting device.
A method of treating organic light emitting devices, comprising:
- placing a first as-fabricated organic light emitting device in an annealing chamber;
- placing a second as-fabricated organic light emitting device in an annealing chamber;
- wherein the first and second as-fabricated organic light emitting devices each comprise:
- an anode;
- a cathode;
- and
- a light emission region that comprises an organic light emitting material disposed between the anode and the cathode;
- and
- annealing the first and second as-fabricated organic light emitting devices at an annealing temperature from about 50° C. and below 100° C. and for an annealing period effective to (i) decrease the operating voltage of each of the first and second as-fabricated organic light emitting devices, and (ii) increase an energy conversion efficiency of each of the first and second as-fabricated organic light emitting devices;
- wherein the annealed first and second as-fabricated organic light emitting devices have respective energy conversion efficiencies that differ by less than about 15%;
- wherein the annealing temperature is below a glass transition temperature of a material of the organic light emitting device.
Dependencies are inferred from the claim text.