Method for fabricating a light-emitting device with uniform color temperature

• US 6,395,564 B1
• Filed: 07/03/2001
• Issued: 05/28/2002
• Est. Priority Date: 02/12/2001
• Status: Expired due to Fees

• Current Assignee: Arima Optoelectronics Corp.
• Original Assignee: Arima Optoelectronics Corp.
• Inventors: Huang, Wen-Chieh
• Primary Examiner(s): Bowers, Charles
• Assistant Examiner(s): Thompson, Craig
• Application Number:
  US09/897,636
• Time in Patent Office: 329 Days
• Field of Search: 438/35,7,34,6,25-28,810
• US Class Current: 438/7
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/50 Wavelength conversion elements

Abstract

The invention provides a method for fabricating a light-emitting diode with uniform color temperature, comprising the steps of: forming a plurality of light-emitting diodes on a wafer; obtaining the light emission wavelengths of the light-emitting diodes on the wafer; and forming different doses of phosphor on the corresponding light-emitting diode on the wafer according to the light emission wavelengths of respective light-emitting diodes. Finally, the light-emitting diodes on the wafer emit light with uniform color temperature.

Claims

1. A method for fabricating a light-emitting diode with uniform color temperature, comprising the steps of:

forming a plurality of light-emitting diodes on a wafer;

obtaining the light emission wavelengths of the light-emitting diodes on the wafer; and

forming different doses of phosphor on the corresponding light-emitting diode in wafer form according to the light emission wavelengths of respective light-emitting diodes;

wherein each light-emitting diodes emits its first wavelength and the phosphor radiates a corresponding second wavelength, and the light-emitting diodes on the wafer emit light with uniform color temperature.

2. A method for fabricating a light-emitting diode with uniform color temperature as claimed in claim 1, wherein when a first wavelength emitted from the diode is longer than the standard wavelength, the dose of phosphor forming on the light-emitting diode on the wafer is reduced.

3. A method for fabricating a light-emitting diode with uniform color temperature as claimed in claim 1, wherein when a first wavelength emitted from the diode is shorter than the standard wavelength, the dose of phosphor forming on the light-emitting diode on the wafer is increased.

4. A method for fabricating a light-emitting diode with uniform color temperature as claimed in claim 1, wherein the phosphor is respectively formed on each light-emitting diode in wafer form by utilizing ink jet printing.

5. A method for fabricating a light-emitting diode with uniform color temperature as claimed in claim 1, wherein the light-emitting diode is a gallium nitride-based III-V group light-emitting diode.

6. A method for fabricating a light-emitting diode with uniform color temperature as claimed in claim 4, wherein the ink jet printing is selected from the group consisting of Thermal Bubble ink jet printing and Piezoelectric ink jet printing.

7. A method for fabricating a light-emitting diode with uniform color temperature as claimed in claim 1, wherein the light-emitting diode is a UV/blue light-emitting diode.

8. A method for fabricating a light-emitting diode with uniform color temperature as claimed in claim 1, wherein the light-emitting diodes on the wafer emit white light with uniform color temperature.

9. A method for fabricating a light-emitting device with uniform color temperature, comprising the steps of:

forming a plurality of light-emitting diodes on a wafer;

obtaining the light emission wavelengths of the light-emitting diodes on the wafer;

forming different doses of phosphor on the corresponding light-emitting diode in wafer form according to the light emission wavelengths of respective light-emitting diodes so as to provide the light-emitting diodes with uniform color temperature on the wafer;

dividing the light-emitting diodes on the wafer into a plurality of white light-emitting dies with uniform color temperature; and

obtaining the white light-emitting device with uniform color temperature by packaging the respective light-emitting dies.

10. A method for fabricating a light-emitting device with uniform color temperature as claimed in claim 9, wherein when a first wavelength emitted from the diode is longer than the standard wavelength, the dose of phosphor forming on the light-emitting diode on the wafer is reduced.

11. A method for fabricating a light-emitting device with uniform color temperature as claimed in claim 9, wherein when a first wavelength emitted from the diode is shorter than the standard wavelength, the dose of phosphor forming on the light-emitting diode on the wafer is increased.

12. A method for fabricating a light-emitting device with uniform color temperature as claimed in claim 9, wherein the phosphor is respectively formed on each light-emitting diode in wafer form by utilizing ink jet printing.

13. A method for fabricating a light-emitting device with uniform color temperature as claimed in claim 9, wherein the light-emitting diode is a gallium nitride-based III-V group light-emitting diode.

14. A method for fabricating a light-emitting device with uniform color temperature as claimed in claim 12, wherein the ink jet printing is selected from the group consisting of Thermal Bubble ink jet printing and Piezoelectric ink jet printing.

15. A method for fabricating a light-emitting device with uniform color temperature as claimed in claim 9, the light-emitting diode is a UV/blue light-emitting diode.

16. A method for fabricating a light-emitting device with uniform color temperature as claimed in claim 9, wherein the light-emitting device emits white light with uniform color temperature.