Light-emitting apparatus

• US 10,510,976 B2
• Filed: 11/30/2017
• Issued: 12/17/2019
• Est. Priority Date: 11/30/2016
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute, Intellectual Property Innovation Corporation
• Original Assignee: Industrial Technology Research Institute
• Inventors: Huang, Yi-Hsiang, Tsai, Yu-Tang, Chen, Kuan-Ting
• Primary Examiner(s): Swanson, Walter H
• Assistant Examiner(s): Ly, Kien C
• Application Number:
  US15/826,709
• Publication Number:
  US 20180151826A1
• Time in Patent Office: 747 Days
• Field of Search: None
• CPC Class Codes: H10K 50/156 comprising a multilayered structure
• CPC Class Codes: H10K 50/166 comprising a multilayered structure
• CPC Class Codes: H10K 50/171 Electron injection layers
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/875 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 59/877 comprising scattering means
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses

Abstract

A light-emitting apparatus including a light-emitting device, a light-guiding structure and a light output structure is provided. The light-emitting device includes a light-emitting layer. The light-guiding structure is configured to guide light emitted from the light-emitting layer. The light-guiding structure is disposed beside the light-emitting device and a refractive index of the light-guiding structure is greater than or equal to an average refractive index of the light-emitting device. The light output structure is configured to receive the light guided by the light-guiding structure to output the light out of the light-emitting apparatus.

Claims

1. A light-emitting apparatus, comprising:

a light-emitting device, comprising a plurality of layers, wherein the plurality of layers comprises a light-emitting layer being transparent;

a light-guiding structure, being transparent, and configured to guide light emitted from the light-emitting layer, wherein the light-guiding structure is disposed beside the light-emitting device, and a refractive index of the light-guiding structure is greater than or equal to an average of refractive indices of the layers of the light-emitting device that is transparent; and

a light output structure, configured to receive the light guided by the light-guiding structure and output the light out of the light-emitting apparatus, wherein the light-guiding structure is disposed between the light-emitting device and the light output structure.

2. The light-emitting apparatus as claimed in claim 1, wherein the refractive index of the light-guiding structure is greater than or equal to 1.6 and is less than or equal to 2.5.

3. The light-emitting apparatus as claimed in claim 1, wherein the light output structure comprises a reflective structure.

4. The light-emitting apparatus as claimed in claim 1, wherein the light output structure is disposed in the light-guiding structure.

5. The light-emitting apparatus as claimed in claim 4, wherein the light output structure comprises a plurality of scattering particles.

6. The light-emitting apparatus as claimed in claim 4, wherein the light output structure comprises a plurality of refraction structures.

7. The light-emitting apparatus as claimed in claim 6, wherein the refraction structures include air or a material whose refractive index is lower than the refractive index of the light-guiding structure.

8. The light-emitting apparatus as claimed in claim 1, wherein the light output structure comprises a groove disposed on a first surface of the light-guiding structure.

9. The light-emitting apparatus as claimed in claim 8, wherein a distance between a bottom of the groove and a second surface of the light-guiding structure opposite to the first surface is less than

10. The light-emitting apparatus as claimed in claim 1, further comprising a substrate, wherein the light-emitting device comprises a light-emitting stacked structure, a first electrode, and a second electrode, the light-emitting stacked structure comprises the light-emitting layer, the first electrode and the second electrode are respectively electrically connected to the light-emitting layer and disposed between the light-emitting stacked structure and the substrate, and the first electrode and the second electrode are separated from each other to expose a portion of a surface of the light-emitting stacked structure.

11. The light-emitting apparatus as claimed in claim 1, further comprising a substrate, wherein the light-emitting device comprises a light-emitting stacked structure, a first electrode, and a second electrode;

the light-emitting stacked structure comprises the light-emitting layer;

the first electrode and the second electrode are respectively electrically connected to the light-emitting layer;

the first electrode is disposed on the light-emitting stacked structure; and

the second electrode is disposed between the light-emitting stacked structure and the substrate.

12. The light-emitting apparatus as claimed in claim 11, wherein the first electrode is a transparent electrode, a semi-transparent electrode, or a reflective electrode that is not pervious to light.

13. The light-emitting apparatus as claimed in claim 11, wherein the second electrode is a transparent electrode or a reflective electrode that is not pervious to light.

14. The light-emitting apparatus as claimed in claim 11, wherein the second electrode is reflective mirror that is not pervious to light.

15. The light-emitting apparatus as claimed in claim 11, wherein the second electrode is a distributed Bragg reflector or a wavelength-selective reflector.

16. The light-emitting apparatus as claimed in claim 11, wherein the light-emitting device further comprises a low refractive index layer whose refractive index is lower than a refractive index of the light-emitting stacked structure, and the low refractive index layer is disposed between the second electrode and the light-emitting stacked structure.

17. The light-emitting apparatus as claimed in claim 1, further comprising a substrate and a refraction-differing transparent layer whose refractive index is different from the refractive index indices of the layers of the light-emitting device that is transparent and the refractive index of the light-guiding structure, wherein the refraction-differing transparent layer is disposed between the light-guiding structure and the substrate.

18. The light-emitting apparatus as claimed in claim 1, further comprising a substrate and an optical film, wherein the optical film is disposed between the light-guiding structure and the substrate, and the optical film comprises an absorption layer, a reflective layer, or a distributed Bragg reflector.

19. The light-emitting apparatus as claimed in claim 1, further comprising a thin film encapsulation layer or a color saturation gaining structure disposed on the light-guiding structure and the light-emitting device, wherein the thin film encapsulation layer is configured to encapsulate the light emitting device and the light-guiding structure, and the color saturation gaining structure is configured to purify a color of the light output out of the light-emitting apparatus and to facilitate color saturation.

20. The light-emitting apparatus as claimed in claim 1, further comprising a substrate and a planar layer, wherein the planar layer is disposed between the light-guiding structure and the substrate.