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Home People Research Research Publications Teaching Protocol Sharing News Center for Pain Medicine Research Brief Info Software Alumni Join us Contact us Kwai Hei Li ResearcherID Assistant Professor School of Microelectronics   Research Group Kwai Hei Li received the B.Eng. and Ph.D. degrees in Electrical and Electronic Engineering from the University of Hong Kong (HKU) in 2009 and 2013, respectively. After graduation, he received 1-year postdoctoral research training at McGill University in Canada. He worked as a Research Assistant Professor in the Department of Electrical and Electronic Engineering at HKU from 2016 to 2019. He is currently an Assistant Professor at the Southern University of Science and Technology (SUSTech). His research interests are the design, fabrication, and characterization of III-nitride optoelectronic integrated devices. He has published more than 120 papers in international peer-reviewed academic journals and conferences, 1 book, 2 book chapters, and >10 invention patents. Research results were highlighted in industry magazines such as Compound Semiconductor and Semiconductor Today. He served as the Treasurer of the IEEE Hong Kong Section ED/SSC Joint Chapter from 2016 to 2020 and the local arrangement chair of the 2016 IEEE International Conference on EDSSC. He was the guest editor of Frontiers in Photonics, the review editor on the editorial board of Frontiers in Physics, and the reviewer of more than 20 journals. He was the recipient of the Springer Theses Award, the Award for Outstanding Research Postgraduate Student at HKU, the Sir Edward Youde Memorial Fellowships, IEEE OGC2022 Best Paper Award, and ACP2022 Best Poster Award. Personal Profile Personal Profile Research Micro- and Nano-patterning of GaN devices Design, fabrication and application of GaN-based optoelectronic devices and integration For more information, please visit the website: http://khli-sustech.sxl.cn. Teaching GaN Semiconductor Materials and Devices Publications Read More Selected Publication 1. K.H. Li, X. Liu, Q. Wang, S. Zhao, and Z. Mi* Ultralow-threshold electrically injected AlGaN nanowire ultraviolet lasers on Si operating at low temperature Nature Nanotechnology 10, 140–144 (2015). (Featured in Semiconductor Today) 2. K.H. Li, W.Y. Fu, Y. F. Cheung, K.K.Y. Wong, Y. Wang, K.M. Lau, and H.W. Choi* Monolithically integrated InGaN/GaN light-emitting diodes, photodetectors, and waveguides on Si substrate Optica 5(5), 564-569 (2018). 3. K.H. Li, W.Y. Fu, and H.W. Choi* Chip-scale GaN integration Progress in Quantum Electronics 70, 100247 (2020). 4. K.H. Li, Y.F. Cheung, W. Jin, W.Y. Fu, A.T.L. Lee, S.-C. Tan, S.Y.R. Hui, and H.W. Choi* InGaN RGB Light-emitting Diodes with Monolithically-Integrated Photodetectors for Stabilizing Color Chromaticity IEEE Transactions on Industrial Electronics 67(6), 5154-5160, (2020). 5. K.H. Li, H. Lu, W.Y. Fu, Y.F. Cheung, H.W. Choi* Intensity-Stabilized LEDs with Monolithically Integrated Photodetectors IEEE Transactions on Industrial Electronics 66(9), 7426 (2019). 6. K.H. Li, Y.F. Cheung, W.Y. Fu, K.K.Y. Wong, H.W. Choi* Monolithic Integration of GaN-on-Sapphire Light-Emitting Diodes, Photodetectors, and Waveguides IEEE Journal of Selected Topics in Quantum Electronics 24(6), 3801706 (2018). 7. Y. Luo, G. Lu, Q. Wang, Z. Chu, and K.H. Li*, Miniature viscometer incorporating GaN optical devices with an ultrawide measurement range Light: Advanced Manufacturing, 4(2) (2023) 8. Y. Luo, X. An, L. Chen, and K.H. Li* Chip-Scale Optical Airflow Sensor Microsystems & Nanoengineering 8, 4 (2022). 9. B. Yu, Y. Luo, L. Chen, Z. Chu, and K.H. Li* An optical humidity sensor: a compact photonic chip integrated with artificial opal Sensors and Actuators: B. Chemical 349, 130763 (2021). 10. X. An, H. Yang, Y. Luo, Z. Chu*, and K.H. Li* Ultrafast miniaturized GaN-based optoelectronic proximity sensor Photonics Research 10, 1964-1970 (2022). 11. Y. Hou#, J. Jing#, Y. Luo, Feng Xu, W. Xie, L. Ma, X. Xia, Q. Wei, Y. Lin*, K.H. Li*, and Z. Chu* A Versatile, Incubator-Compatible, Monolithic GaN Photonic Chipscope for Label-Free Monitoring of Live Cell Activities Advanced Science 9(17), 2200910 (2022). 12. J. Jing, Y. Hou, Y. Luo, L. Chen, L. Ma, Y. Lin, K.H. Li*, and Z. Chu* Chip-Scale In Situ Salinity Sensing Based on a Monolithic Optoelectronic Chip ACS Sensors 7, 849−855 (2022). 13. B. Yu, Y. Luo, J. Li, H. Ye, and K.H. Li* Interface Engineering in Chip-Scale GaN Optical Devices for Near- Hysteresis-Free Hydraulic Pressure Sensing ACS Applied Materials & Interfaces 14(33), 38351–38357 (2022). 14. L. Chen#, X.S. An#, J.X. Jing, H.T. Jin, Z.Q. Chu, and K.H. Li* Ultracompact Chip-Scale Refractometer Based on an InGaN-Based Monolithic Photonic Chip ACS Applied Materials & Interfaces 12(44), 49748-49754 (2020). 15. Y.F. Cheung#, K.H. Li#, and H.W. Choi* Flexible Free-Standing III-Nitride Thin Films for Emitters and Displays ACS Applied Materials & Interfaces 8(33), 21440–21445 (2016). 16. T. Zhang, M. Gupta, J. Jing, Z. Wang, Q. Wang*, K.H. Li*, and Z. Chu* High-Quality Diamond Microparticles Containing SiV Centers Grown by Chemical Vapor Deposition with Preselected Seeds Journal of Materials Chemistry C 10, 13734-13740 (2022). (Selected as the inside front cover) 17. J. Li#, J. Wu#, L. Chen, X. An, J. Yin, Y. Wu, L. Zhu. H. Yi, and K.H. Li* On-chip Integration of III-Nitride Flip-Chip Light-Emitting Diodes with Photodetectors Journal of Lightwave Technology 39(8), 2603-2608 (2021). (Featured in Semiconductor Today) 18. F. Geng#, B. Yu#, and K.H. Li*, Fast response PDMS/GaN Optical Vacuum Microsensors IEEE Electron Device Letters, 44(2), 310-304 (2023). 19. H. Yang#, Y. Luo#, G. Lu#, Y. Chai*, Z. Chu*, and K.H. Li*, Viscosity Sensors Based on III-Nitride Optical Devices Integrated With Droplet Sliding Channels IEEE Electron Device Letters, 43(12), 2169-2172 (2022). (Selected as the Editors’ Pick) 20. J. Yin, H. Yang, Y. Luo, Q. Wang, H. Yu, and K.H. Li* III-Nitride Microsensors for 360 degrees Angle Detection IEEE Electron Device Letters 43, 458-461 (2022). (Selected as the Editors’ Pick) 21. X. An#, Y. Luo#, B. Yu, L. Chen, and K.H. Li* A Chip-Scale GaN-Based Optical Pressure Sensor With Microdome-Patterned Polydimethylsiloxane (PDMS) IEEE Electron Device Letters 42(10), 1532-1535 (2021). 22. Y. Luo#, B. Yu#, L. Chen, and K.H. Li* Micro Humidity Sensor based on a GaN Chip with Silica Opal IEEE Electron Device Letters 42(5), 743-746 (2021). (Selected as the Editors’ Pick and Front Cover) 23. K.H. Li, Y.F. Cheung, W.Y. Fu and H.W. Choi* Electrically injected whispering-gallery mode InGaN/GaN microdisks Applied Physics Letters 119, 101106 (2021). 24. K.H. Li, Y.F. Cheung, W.S. Cheung and H.W. Choi* Confocal microscopic analysis of optical crosstalk in GaN micro-pixel light-emitting diodes Applied Physics Letters 107, 171103 (2015). 25. Y.F. Cheung#, K.H. Li#, R.S.Y. Hui, and H.W. Choi* Observation of enhanced visible and infrared emissions in photonic crystal thin-film light-emitting diodes Applied Physics Letters 105, 071104 (2014). 26. K.H. Li, C. Feng, and H.W. Choi* Analysis of Micro-lens Integrated Flip-chip InGaN Light-emitting Diodes by Confocal Microscopy Applied Physics Letters 104, 051107 (2014). 27. K.H. Li, K.Y. Zang, S.J. Chua, and H.W. Choi* III-nitride Light-emitting Diode with Embedded Photonic Crystals Applied Physics Letters 102, 181117 (2013). 28. K.H. Li, Z.T. Ma and H.W. Choi* Tunable clover-shaped GaN photonic bandgap structures patterned by dual-step nanosphere lithography Applied Physics Letters 100, 141101 (2012). 29. K.H. Li, Z.T. Ma and H.W. Choi* High-Q whispering-gallery mode lasing from nanosphere-patterned GaN nanoring arrays Applied Physics Letters 98, 071106 (2011). 30. X. An, H. Yang, Y. Luo, Q. Wang, Z. Chu*, and K.H. Li* Compact GaN-based optical inclinometer Optics Letters 47, 1238-1241 (2022). 31. X.S. An, L. Chen, J. Li, and K.H. Li* Compact integration of GaN-based photonic chip with microfluidics system Optics Letters 46(12), 170-173 (2021). 32. H. Jin, L. Chen, J. Li, X. An, Y.P. Wu, L. Zhu, H. Yi, and K.H. Li* Vertically-Stacked RGB LEDs with Optimized Distributed Bragg Reflectors Optics Letters 45(24), 6671-6674 (2020). (Selected as Cover Story) 33. L. Chen, Y.P. Wu, and K.H. Li* Monolithic InGaN/GaN photonic chips for heart pulse monitoring Optics Letters 45(18), 4992 (2020). 34. K.H. Li, Y.F. Cheung, and H.W. Choi* Whispering gallery mode lasing in optically isolated III-nitride nanorings Optics Letters 40, 2564-2567 (2015). 35. K.H. Li, Z.T. Ma and H.W. Choi* Single-mode whispering gallery lasing from metal-clad GaN nanopillars Optics Letters 37, 374 (2012). 36. J. Chen, J. Yin, X. An, L. Chen, L. Zhu, and K.H. Li* III-Nitride Microchips for Sugar Concentration Detection IEEE Sensors Journal 22(3), 2078-2082 (2022). 37. J. Chen, L. Chen, L. Zhu, X. Zhang, and K.H. Li* Simultaneous Curing and Monitoring of Resin Using GaN Chips IEEE Sensors Letters 6(4), 3500804 (2022). 38. H. Yang, X. An, Y. Luo, L. Chen, and K.H. Li* Investigation of the Angle-Detecting Mechanism of GaN-Based Optical Devices Incorporating Liquid Pendulums IEEE Sensors Letters 6(8), 3501904 (2022). 39. J. Yin, X. An, L. Chen, Q. Wang, H. Yu, H. Huang, and K.H. Li* A Miniature GaN Chip for Surface Roughness Measurement IEEE Transactions on Electron Devices 68, 4977-4981, (2021). 40. J.H. Yin, X.S. An, L. Chen, J. Li, J.N. Wu, Y.M. Luo, Q. Wang, H.Y. Yu, and K.H. Li* Phosphor-based InGaN/GaN White Light-Emitting Diodes with Monolithically Integrated Photodetectors IEEE Transactions on Electron Devices 68(1), 132-137 (2021). 41. H. Jin, L. Chen, J. Wu, Y. Wu, L. Zhu*, and K.H. Li* High-Performance III-Nitride Light-Emitting Diode Stripes IEEE Transactions on Electron Devices 68, 5629-5633 (2021). 42. K.H. Li, Y.F. Cheung, H.W. Choi* Tunable GaN Photonic Crystal and Microdisk on PDMS Flexible Films ACS Applied Electronic Materials 1(7),1112-1119 (2019). 43. X.S. An, L. Chen, J. Li, Q. Wang, and K.H. Li* Compact GaN-Based Photonic Chip for In Situ Real-Time Monitoring of Low Water Content in Ethanol ACS Applied Electronic Materials 2(11), 3502-3507 (2020). 44. J. Jing#, X. An#, Y. Luo, L. Chen, Z.Q. Chu*, and K.H. Li* A Compact Optical Pressure Sensor Based on a III-Nitride Photonic Chip with Nanosphere-Embedded PDMS ACS Applied Electronic Materials 3(5), 1982-1987 (2021). 45. K.H. Li, Y.F. Cheung, and H.W. Choi* Optical and Thermal Analyses of Thin-film Hexagonal Micro-mesh Light-emitting Diodes IEEE Photonics Technology Letters 25, 374 (2013). 46. J. Yin, L. Chen, Y. Luo, Q. Wang, H. Yu, and K.H. Li* Performance of InGaN green light-emitting diodes with on-chip photodetectors based on wire-bonding and flip-chip configurations Applied Optics 60(9), 2599-2603 (2021). (Selected as the Editors’ Pick and Front Cover) 47. K.H. Li and H.W. Choi* Air-spaced GaN nanopillar photonic band gap structures patterned by nanosphere lithography Journal of Applied Physics 109, 023107 (2010). 48. K.H. Li, and H.W. Choi* InGaN light-emitting diodes with indium-tin-oxide photonic crystal current-spreading layer Journal of Applied Physics 110, 053104 (2011). 49. K.H. Li, Y.F. Cheung, C.W. Tang, C. Zhao, K.M. Lau and H.W. Choi* Optical crosstalk analysis of micro-pixelated GaN-based light-emitting diodes on sapphire and Si substrates Physica Status Solidi A 213(5), 1193-1198 (2016). 50. K.H. Li, Q. Wang, H.P.T. Nguyen, S. Zhao, and Z. Mi* Polarization-resolved electroluminescence study of InGaN/GaN dot-in-a-wire light-emitting diodes grown by molecular beam epitaxy Physica Status Solidi A 201431726, (2015). 51. K.H. Li, Q. Zhang, and H.W. Choi* 1-mu m Micro-Lens Array on Flip-Chip Light-Emitting Diode Japanese Journal of Applied Physics 52, 08JH08, (2013). 52. K.H. Li, K.Y. Zang, S.J. Chua, and H.W. Choi* Embedding nano-pillar arrays into InGaN light-emitting diodes Physica Status Solidi (c) 11, 742 (2014). (Selected as the Front Cover) 53. K.H. Li, and H.W. Choi* Tuning of photonic bandgap via dimensional control of nano-pillars Physica Status Solidi (c) 8, 2351 (2011). Join us Read More Contact Us Contact Address No. 1088, Xueyuan Road, Nanshan District, Shenzhen City Office Phone Email khli@sustech.edu.cn