Multi-Facet Microrod Light-Emitting Diode with Full Visible Spectrum Emission
Yun-Jing Li1, Jet-Rung Chang1, Shih-Pang Chang2, Bo-Wen Lin3, Yen-Hsien Yeh4, Hao-Chung Kuo3, Chung-Yen Chang1, Yuh-Jen Cheng4*
1Department of Electronics Engineering, National Chiao Tung University, Hsinchu, Taiwan
2National Nano Device Laboratories, Hsinchu, Taiwan
3Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan
4Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan
* presenting author:Yuh-Jen Cheng,
We report the demonstration and study of an electrically driven microrod LED that can emit full visible spectrum. The high-resolution electroluminescent image revealed a self-organized array of emission spots. Multiple quantum wells were grown on the self-formed crystal facets of microrods. The microrod surface evolved from the starting {11-20} to ending {10-10} facet hexagons during the growth. It is attributed to the growth competition between these two crystal planes. This crystal plane evolution created specific regions of better quality quantum wells and resulted in the organized self-assembled electroluminescent spot emission pattern. The broad visible emission spectrum of this multi-faceted microrod LED and the understanding of its growth evolution and the formation of self-assembled spot emission pattern could be very useful in the development of next generation full visible spectrum lighting and display devices.

Keywords: Light emitting diode, GaN , semipolar, multiple quantum well