| Biography | |
|---|---|
 Prof. Shengjun Zhou Wuhan University, China |
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| Title: High-brightness GaN-based visible and ultraviolet light-emitting diodes | |
| Abstract: GaN-based light-emitting diodes (LEDs) have been applied in many areas, such as backlights for liquid crystal displays (LCDs), solid-state lighting, visible light communications, head-up displays, and optogenetics. The internal quantum efficiency of GaN-based blue LEDs has been above 85%. However, the light extraction efficiency of GaN-based blue LEDs is relatively low due to total internal reflection (TIR) of the generated light at the GaN/air interface resulting from their very different refractive indices. This talk will outline the emerging challenges in design and fabrication of light extraction micro/nao-structure for high efficiency LEDs. Research in developing efficient light extraction micro/nao-structures, such as surface roughening, patterned indium-tin oxide (ITO) transparent conductive layer, patterned SiO2 current blocking layer, cone-shaped patterned sapphire substrate, wavy sidewalls, sidewall nano-prisms, embedded air void microstructure, distributed Bragg reflector (DBR), laser lift-off, nanoscale Ni/Au wire gird, and flip-chip technology, will be discussed. In addition, the recent development in green LEDs and ultraviolet LEDs will also be discussed in this talk. | |
| Biography: Shengjun Zhou received the Ph.D. degree from Shanghai Jiao Tong University, Shanghai, China, in 2011. He is now a Professor at Wuhan University. His current research interests lie in the areas of GaN-based blue/green/ultraviolet LEDs, nitride semiconductors, nanoimprint lithography and direct laser writing with applications in electronic and photonic devices. He is well known as an industrial technologist. Prior to joining Wuhan University, he was a CTO at Quantum Wafer Inc. from 2011 to 2014, focusing on the development of high-brightness GaN-based high-power LEDs. He was a research fellow at University of Michigan, Ann Arbor, from 2014 to 2015. He received many academic awards including distinguished Young Scholar of Hubei province, Chutian Scholar of Hubei province, and Luojia Young Scholar of Wuhan University. He has published more than 50 papers and holds 10 patents. | |
