Fine tuning of emission spectra by combination of multiple emitter spectra

• US 9,054,343 B2
• Filed: 01/09/2014
• Issued: 06/09/2015
• Est. Priority Date: 06/17/2011
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: Adamovich, Vadim, Yamamoto, Hitoshi, Weaver, Michael S.
• Primary Examiner(s): Tran, Tran
• Application Number:
  US14/151,307
• Publication Number:
  US 20140127847A1
• Time in Patent Office: 516 Days
• Field of Search: 438/46
• US Class Current: 1/1
• CPC Class Codes: H10K 50/13 comprising stacked EL layers within one EL unit
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 85/341 Transition metal complexes, e.g. Ru(II)polypyridine complexes H10K85/331 takes precedence
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/346 comprising platinum
• CPC Class Codes: H10K 85/348 comprising osmium
• CPC Class Codes: H10K 85/361 Polynuclear complexes, i.e. complexes comprising two or more metal centers
• CPC Class Codes: H10K 85/371 Metal complexes comprising a group IB metal element, e.g. comprising copper, gold or silver
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/633 comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole

Abstract

A method of fabricating a first device includes providing a first container that contains, in a desired proportion, a first organic emitting material having a first peak wavelength, a second organic emitting material having a second peak wavelength; providing a substrate having a first electrode disposed thereon; depositing an emissive layer over the first electrode, wherein the first container is a source of material for depositing, and wherein the emissive layer has a homogeneous composition and comprises the first and second organic emitting materials in the desired proportion; depositing a second electrode over the first emissive layer, and wherein the second peak wavelength is between 0 and 40 nm greater than the first peak wavelength.

Claims

1. A method of fabricating a first device, comprising:

providing a first container that contains, in a desired proportion;

a first organic emitting material having a first peak wavelength;

a second organic emitting material having a second peak wavelength

providing a substrate having a first electrode disposed thereon;

depositing an emissive layer over the first electrode, wherein the first container is a source of material for depositing, and wherein the emissive layer has a homogeneous composition and comprises the first and second organic emitting materials in the desired proportion;

depositing a second electrode over the first emissive layer, and

wherein the second peak wavelength is between 0 and 40 nm greater than the first peak wavelength.

2. The method of claim 1, wherein depositing the emissive layer further comprises depositing an organic host material along with the first and second organic emitting materials.

3. The method of claim 2, wherein the organic host material is provided in the first container along with the first and second organic emitting materials, and the organic host material is deposited from the first container along with the first and second organic emitting materials.

4. The method of claim 2, wherein the organic host material is provided in a second container and the organic host material is deposited from the second container.

5. The method of claim 1, wherein the first and second organic emitting materials are phosphorescent organic light emitting materials.

6. The method of claim 1, wherein the second peak wavelength is between 12 and 28 nm greater than the first peak wavelength.

7. The method of claim 1, wherein the FWHM of the emissive spectrum of the first device is less than the greater of the FWHM of the emissive spectrum of:

(i) a second device that is the same as the first device in all respects except that it includes the first emitting material but not the second emitting material, and (ii) a third device that is the same as the first device in all respects except that it includes the second emitting material but not the first emitting material.

8. The method of claim 1, wherein the first device emits a third peak wavelength that is between the first peak wavelength and the second peak wavelength.

9. The method of claim 1, wherein the first electrode, the emissive layer, and the second electrode forming a first device wherein, the first device emits a third peak wavelength that is between the first peak wavelength and the second peak wavelength;

the concentration of the first organic emitting material in the emissive layer is C1, the concentration of the second organic emitting material in the emissive layer is C2, the first, second and third peak wavelengths are λ

1, λ

2, and λ

3, respectively, and

the third peak wavelength λ

3 is within 4% of;

((λ

1 C1)+(λ

2 C2))/(C1+C2).

10. The method of claim 9, wherein the measured FWHM of the emissive spectrum of the first device is less than the combined emission of the first and second emitting materials calculated based on the proportions of the first and second emitting materials present in the emissive layer.

11. The method of claim 9, wherein the measured FWHM of the emissive spectrum of the first device is at least 10% less than the combined emission of the first and second emitting materials calculated based on the proportions of the first and second emitting materials present in the emissive layer.

12. The method of claim 9, wherein the first device is an organic light emitting device.

13. The method of claim 9, wherein the first device is a panel comprising a plurality of organic light emitting devices controlled by an active matrix.

14. The method of claim 9, wherein the first device is a consumer product.