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Youngbin Tchoe, Janghyun Jo, Miyoung Kim, Jaehyuk Heo, Geonwook Yoo, Cheolsoo Sone and Gyu-Chul Yi Variable-Color Light-Emitting Diodes Using GaN Microdonut arrays Advanced Materials 26

Article first published online: 22 FEB 2014 | DOI: 10.1002/adma.201305684

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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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