Advanced Materials

Variable-Color Light-Emitting Diodes Using GaN Microdonut arrays

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Abstract

Microdonut-shaped GaN/InxGa1−xN light-emitting diode (LED) microarrays are fabricated for variable-color emitters. The figure shows clearly donut-shaped light emission from all the individual microdonut LEDs. Furthermore, microdonut LEDs exhibit spatially-resolved blue and green EL colors, which can be tuned by either controlling the external bias voltage or changing the size of the microdonut LED.

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