Method of making a light emitting device and a light emitting device made thereof
View Patent ↗The method includes preparing a plurality of light-emitting units, one of the plurality of light-emitting units comprising an electrode, a light-emitting stack, and a protection layer with a first part covering the electrode and a second part which comprises a portion surrounding the electrode and covers the light-emitting stack; removing the portion without removing the first part; forming a wavelength conversion layer on the first part and the light-emitting stack not covered by the second part; and removing the first part to substantially expose the electrode.
1. A method of making a light-emitting diode, comprising:
preparing a plurality of light-emitting units, one of the plurality of light-emitting units comprising an electrode, a light-emitting stack, and a protection layer having a first part covering the electrode and a second part which comprises a portion surrounding the electrode and covers the light-emitting stack;
separating the plurality of light-emitting units into a plurality of light-emitting chips after the first part covering the electrode;
removing the portion without removing the first part;
forming a wavelength conversion layer on the first part and the light-emitting stack not covered by the second part; and
removing the first part to substantially expose the electrode.
2. The method of claim 1 , wherein the plurality of light-emitting chips have an emission wavelength difference smaller than 10 nm.
3. The method of claim 1 , wherein the plurality of light-emitting chips have a forward voltage difference less than 0.4V.
4. The method of claim 1 , wherein the plurality of light-emitting units are commonly formed on a wafer.
5. The method of claim 1 , wherein the plurality of light-emitting units comprises a first light-emitting unit formed on a first wafer, and a second light-emitting unit formed on a second wafer.
6. The method of claim 1 , wherein the step of removing the first part comprises partially removing the wavelength conversion layer.
7. The method of claim 1 , wherein the step of removing the first part comprises substantially removing all the protection layer.
8. The method of claim 1 , wherein the second part is removed before forming the wavelength conversion layer.
9. The method of claim 1 , wherein the electrode is surrounded by the wavelength conversion layer.
10. The method of claim 1 , wherein the electrode has a top surface which is entirely exposed at the removing step.
11. The method of claim 1 , wherein the electrode comprises a top surface being entirely covered by the first part before removing the first part.
12. A method of making a light-emitting diode, comprising:
preparing a plurality of light-emitting units which are connected to each other, one of the plurality of light-emitting units comprising an electrode, a light-emitting surface connected to the electrode, and a protection layer having a first part and a second part which covers the light-emitting surface;
removing the second part to expose the light-emitting surface without removing the first part;
forming a wavelength conversion layer on the first part and the light-emitting surface; and
removing the first part to expose the electrode.
13. The method of claim 12 , further comprising singularizing the plurality of light-emitting units covered by the wavelength conversion layer to form one or more light-emitting diodes.
14. The method of claim 12 , wherein the electrode has a top surface which is entirely exposed after removing the first part.
15. The method of claim 12 , wherein the second part is removed before forming the wavelength conversion layer.
16. The method of claim 12 , wherein the step of removing the first part comprises partially removing the wavelength conversion layer.