Enhanced Light Extraction of Flip-Chip Mini-LEDs with Prism-Structured Sidewall

Enhanced Light Extraction of Flip-Chip Mini-LEDs with Prism-Structured Sidewall

Blog Article

Current solutions for improving the light extraction efficiency of flip-chip light-emitting diodes (LEDs) mainly focus on relieving the total internal reflection at sapphire/air interface, but such methods hardly affect the epilayer mode photons.We demonstrated that the prism-structured sidewall based Pleated on tetramethylammonium hydroxide (TMAH) etching is a cost-effective solution for promoting light extraction efficiency of flip-chip mini-LEDs.The anisotropic TMAH etching created hierarchical prism structure on sidewall of mini-LEDs for coupling out Rolling Pin photons into air without deteriorating the electrical property.

Prism-structured sidewall effectively improved light output power of mini-LEDs by 10.3%, owing to the scattering out of waveguided light trapped in the gallium nitride (GaN) epilayer.