Spontaneously integrated multicolor InGaN micro‐LEDs for spectrum‐controllable broadband light sources

Spontaneously integrated multicolor InGaN micro‐LEDs with a micro‐stripe topography achieve selective electrical operation with four different color emissions: green, bluish‐green, bluish‐purple, and purple. The entire micro‐stripe displays broadband emissions because the stripe topography with a convex lens–like cross‐section induces a continuous emission wavelength gradient in the overgrown InGaN active layers. Since each wavelength component is distributed along the stripe direction, multiple narrow p‐electrodes are positioned side‐by‐side across the stripe width. This design supports selective current injection into the corresponding local areas. This work represents an important step for realizing broadband visible light emitters where individual wavelength components composing the broad spectra can be modulated and switched independently.This article is protected by copyright. All rights reserved.