LIGHT-EMITTING DEVICES AND METHOD FOR FABRICATING THE SAME

• US 20200135985A1
• Filed: 10/31/2018
• Published: 04/30/2020
• Est. Priority Date: 10/31/2018
• Status: Active Grant

• Current Assignee: Visera Technologies Company Limited (Taiwan Semiconductor Manufacturing Company Limited)
• Original Assignee: Visera Technologies Company Limited (Taiwan Semiconductor Manufacturing Company Limited)
• Inventors: WANG, Wei-Ko, WU, Chia-Hui
• Granted Patent: US 10,804,441 B2
• Time in Patent Office: Days
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01L 2933/0025 relating to coatings
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body

Abstract

A light-emitting device is provided. The light-emitting device includes a substrate including a plurality of pixels, each pixel including a plurality of subpixels designed to emit light with different colors. The plurality of subpixels includes a first subpixel designed to emit red light, a second subpixel designed to emit green light, and a third subpixel designed to emit blue light. The first subpixel includes a first light source formed on the substrate, a red light-emitting layer covering the first light source, and a first yellow color filter covering the red light-emitting layer. The second subpixel includes a second light source formed on the substrate, a green light-emitting layer covering the second light source, and a second yellow color filter covering the green light-emitting layer. The third subpixel includes a third light source formed on the substrate. A method for fabricating the light-emitting device is also provided.

Claims

1. A light-emitting device, comprising:

a substrate comprising a plurality of pixels, each pixel comprising a plurality of subpixels designed to emit light with different colors, wherein the plurality of subpixels comprise;

a first subpixel designed to emit red light, comprising;

a first light source formed on the substrate;

a red light-emitting layer covering the first light source;

a first yellow color filter covering the red light-emitting layer;

a second subpixel designed to emit green light, comprising;

a second light source formed on the substrate;

a green light-emitting layer covering the second light source;

a second yellow color filter covering the green light-emitting layer; and

a third subpixel designed to emit blue light, comprising;

a third light source formed on the substrate.

2. The light-emitting device as claimed in claim 1, wherein the first light source, the second light source and the third light source emit deep blue light.

3. The light-emitting device as claimed in claim 1, wherein the first light source, the second light source and the third light source emit blue light.

4. The light-emitting device as claimed in claim 1, wherein the red light-emitting layer comprises red phosphor.

5. The light-emitting device as claimed in claim 1, wherein the green light-emitting layer comprises green phosphor.

6. The light-emitting device as claimed in claim 1, wherein the first yellow color filter and the second yellow color filter comprise yellow pigments blended in a polymer matrix.

7. The light-emitting device as claimed in claim 1, wherein the first yellow color filter and the second yellow color filter have a thickness which is in a range from 0.8 μ

m to 2.0 μ

m.

8. The light-emitting device as claimed in claim 1, wherein the first yellow color filter and the second yellow color filter have a light transmittance rate which is less than 1% for light with a wavelength of 400 nm to 480 nm.

9. The light-emitting device as claimed in claim 1, wherein the first yellow color filter and the second yellow color filter have a light transmittance rate which is greater than 80% for light with a wavelength of 550 nm or above.

10. The light-emitting device as claimed in claim 1, wherein the first yellow color filter and the second yellow color filter have a light transmittance rate which is equal to 50% for light with a wavelength of 490 nm to 530 nm.

11. The light-emitting device as claimed in claim 1, wherein the first yellow color filter and the second yellow color filter have curved structures or polygonal structures in a cross-section perpendicular to the substrate.

12. The light-emitting device as claimed in claim 2, further comprising a blue light-emitting layer covering the third light source.

13. The light-emitting device as claimed in claim 12, wherein the blue light-emitting layer comprises blue phosphor.

14. The light-emitting device as claimed in claim 12, further comprising a first light guiding layer formed between the first light source and the red light-emitting layer, a second light guiding layer formed between the second light source and the green light-emitting layer, and a third light guiding layer formed between the third light source and the blue light-emitting layer.

15. The light-emitting device as claimed in claim 3, further comprising a first light guiding layer formed between the first light source and the red light-emitting layer, a second light guiding layer formed between the second light source and the green light-emitting layer, and a third light guiding layer covering the third light source.

16. The light-emitting device as claimed in claim 1, wherein the first light source constitutes a first micro LED device, the second light source constitutes a second micro LED device, and the third light source constitutes a third micro LED device.

17. The light-emitting device as claimed in claim 16, wherein each of the first micro LED device, the second micro LED device and the third micro LED device has a width which is in a range from 1 μ

m to 100 μ

m.

18. A method for fabricating a light-emitting device, comprising:

providing a substrate with a first light source, a second light source and a third light source mounted thereon, wherein the second light source is located between the first light source and the third light source, the first light source is covered by a red light-emitting layer, and the second light source is covered by a green light-emitting layer;

forming a yellow color filter layer over the substrate; and

performing a lithography process on the yellow color filter layer to form a first yellow color filter and a second yellow color filter, wherein the first yellow color filter covers the red light-emitting layer, and the second yellow color filter covers the green light-emitting layer.

19. The method for fabricating a light-emitting device as claimed in claim 18, wherein the step of forming a yellow color filter layer over the substrate is performed by a spin-coating or spray-coating process.