Patent ID: 11901491
Assignee: LUMILEDS, LLC
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A light emitting diode (LED) device comprising:
a mesa comprising semiconductor layers, the semiconductor layers including an N-type layer, an active layer, and a P-type layer, the mesa having a height less than or equal to its width, the mesa having a top surface and at least one side wall, the at least one side wall defining a trench having a bottom surface;
a first passivation layer on the at least one side wall and on the top surface of the mesa and not on the bottom surface of the trench, the first passivation layer comprising one or more of a silicon nitride (SiN), titanium oxide (TiO2), niobium oxide (NbO2), aluminum oxide (Al2O3), hafnium oxide (HfO2), aluminum nitride (AlN), silicon dioxide (SiO2), and hafnium-doped silicon dioxide (HfSiO2);
a second passivation layer on the first passivation layer, the second passivation layer comprising a low-refractive index material having a refractive index in of about 1, wherein the low-refractive index material comprises a material selected from the group consisting of, porous silicon nitride (SiN), porous titanium oxide (TiOx), porous aluminum oxide (AlOx), porous hafnium oxide (HfOx), porous niobium oxide (NbOx), porous aluminum indium gallium nitride (AlInGaN), and porous aluminum indium gallium phosphide (AlInGaP);
a p-type contact on the top surface of the mesa; and
an n-type contact on the bottom surface of the trench.