Multi color active regions for white light emitting diode
View Patent ↗A light emitting diode device has a gallium and nitrogen containing substrate with a surface region with an epitaxial layer overlying the surface region. Preferably the device includes a first active region overlying the surface and configured to emit first electromagnetic radiation having a wavelength ranging from about 405 nm to 490 nm; a second active region overlying the surface and configured to emit second electromagnetic radiation having a wavelength ranging from about 491 nm to about 590 nm; and a third region overlying the surface region and configured to emit third electromagnetic radiation having a wavelength ranging from about 591 nm to about 700 nm. A p-type epitaxial layer covers the first, second, and third active regions.
1. A light emitting diode device comprising:
a gallium and nitrogen containing substrate having a surface region;
an n-type epitaxial layer overlying the surface region;
at least one first active region overlying at least one portion of the surface region and being configured to first emit electromagnetic radiation having a wavelength ranging from about 405 nm to 490 nm;
at least one second active region overlying at least one portion of the surface region and being configured to second emit electromagnetic radiation having a wavelength ranging from about 520 nm to about 620 nm, the at least one second active regions being positioned above the at least one first active regions;
a p-type epitaxial layer overlying the at least one first and second active regions; and
a barrier layer positioned between the first active region and the second active region.
2. The device of claim 1 wherein the barrier layer comprises magnesium material.
3. The device of claim 1 , wherein the at least one first active region comprises a first indium containing material.
4. The device of claim 1 , wherein the at least one second active region comprises a second indium containing material.
5. The device of claim 1 , wherein the first electromagnetic radiation is characterized by a blue color and the second electromagnetic radiation is characterized by a yellow color.
6. The device of claim 1 , wherein the at least one first active region and the at least one second active region are configured in a stacked configuration.
7. The device of claim 1 , wherein the first electromagnetic radiation and the second electromagnetic radiation combine to form substantially white light.
8. The device of claim 1 , wherein the surface region is oriented in a polar configuration.
9. The device of claim 1 , wherein the surface region is oriented in a non-polar configuration.
10. The device of claim 1 , wherein the surface region is oriented in a semi-polar configuration.
11. The device of claim 1 , comprising at least one third region overlying at least one portion of the surface region and being configured to emit third electromagnetic radiation having a wavelength ranging from about 591 nm to about 700 nm.
12. The device of claim 11 , wherein the at least one third active region comprise third indium containing material.
13. The device of claim 11 , wherein the at least one first active region, the at least one second active region, and the at least one third active region are configured in a stacked configuration.
14. The device of claim 11 , wherein the first electromagnetic radiation, the second electromagnetic radiation, and third electromagnetic radiation combine to emit substantially white light.
15. The device of claim 1 , further comprising at least one tunnel junction region between the at least one first and the at least one second active region.
16. The device of claim 11 , further comprising at least one tunnel junction region between the at least one second and the at least one third active region.