TOP-EMITTING OLED DEVICE WITH LIGHTS-SCATTERING LAYER AND COLOR-CONVERSION

• US 20110248256A1
• Filed: 06/22/2011
• Published: 10/13/2011
• Est. Priority Date: 02/24/2006
• Status: Active Grant

• Current Assignee: Andrew D. Arnold, Mitchell S. Burberry, Ronald S. Cok
• Original Assignee: Andrew D. Arnold, Mitchell S. Burberry, Ronald S. Cok
• Inventors: Cok, Ronald S., Arnold, Andrew D., Burberry, Mitchell S.
• Granted Patent: US 8,258,693 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 50/8428 Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/854 comprising scattering means
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/8723 Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
• CPC Class Codes: H10K 59/873 Encapsulations
• CPC Class Codes: H10K 59/877 comprising scattering means
• CPC Class Codes: H10K 59/8792 comprising light absorbing layers, e.g. black layers

Abstract

A top-emitting OLED device, comprising: one or more OLEDs formed on a substrate; a light-scattering layer formed over the one or more OLEDs; a transparent cover; one or more color filters formed on the transparent cover; a color-conversion material layer formed over the color filters, or formed over or integral with the light-scattering layer; wherein the substrate is aligned and affixed to the transparent cover so that the locations of the color filters and color conversion material correspond to the location of the OLEDs, and the color-conversion material layer, color filters, and the light-scattering layer are between the cover and substrate, and a low-index gap is formed between the light-scattering layer and the color filters, with no light-scattering layer being positioned between the color conversion material layer and the low-index gap, wherein the color-conversion material layer is formed integrally with the light-scattering layer.

Claims

1. A top-emitting OLED device, comprising:

one or more OLEDs formed on a substrate, the OLED including a first electrode formed over the substrate, one or more layers of light-emitting organic material formed over the first electrode, and a transparent second electrode formed over the one or more layers of light-emitting organic material;

a light-scattering layer formed over the one or more OLEDs for scattering light emitted by the one or more layers of light-emitting organic material;

a transparent cover;

one or more color filters formed on the transparent cover;

a color-conversion material layer formed over the color filters, or formed over or integral with the light-scattering layer;

wherein the substrate is aligned and affixed to the transparent cover so that the locations of the color filters and color conversion material correspond to the location of the OLEDs, and the color-conversion material layer, color filters, and the light-scattering layer are between the cover and substrate, and a low-index gap is formed between the light-scattering layer and the color filters, with no light-scattering layer being positioned between the color conversion material layer and the low-index gap; and

wherein the color-conversion material layer is formed integrally with the light-scattering layer.

2. The OLED device of claim 1, wherein the integral light-scattering and color-conversion material layer comprises light-scattering particles of a first size and color-conversion material particles or dye molecules of a relatively smaller second size and the color-conversion material is intermixed between the light-scattering particles.

3. The OLED device of claim 2, wherein the integral layer is thicker than the size of the light-scattering particles.

4. The OLED device of claim 2, wherein the integral layer is approximately as thick as, or thinner than, the size of the light-scattering particles.

5. The OLED device of claim 2, wherein the light-scattering particles and color-conversion material particles or dye molecules are dispersed in a matrix layer.

6. The OLED device of claim 2, wherein light-scattering particles and color-conversion material particles are coated in a layer with no matrix.

7. A top-emitting OLED device, comprising:

one or more OLEDs formed on a substrate, the OLED including a first electrode formed over the substrate, one or more layers of light-emitting organic material formed over the first electrode, and a transparent second electrode formed over the one or more layers of light-emitting organic material;

a light-scattering layer formed over the one or more OLEDs for scattering light emitted by one or more layers of light-emitting organic material;

a transparent cover having a first refractive index;

one or more color filters formed on the transparent cover;

a color-conversion material layer formed integral with the light-scattering layer and a low-index gap having a second refractive index less than the first refractive index and disposed between the color conversion material layer and the color filters; and

wherein the substrate is aligned and affixed to the transparent cover so that the locations of the color filters and color conversion material correspond to the location of the OLEDs, and the color-conversion material layer, color filters, and the light-scattering layer are between the cover and substrate.

8. The OLED device of claim 7, wherein the light-scattering layer scatters light emitted by the one or more layers of light-emitting organic material and light re-emitted by the color-conversion material layer.