High performance III-nitride micro-LEDs: Novel applications and Mechanism study

Speaker: Dr. Shuailong Zhang (University of Strathclyde)

Time and Date: 10:00- , Sep. 26, 2014

Place: Room B415, Computing Centre Building, Handan Campus

 

 

Abstract

III-nitride micro-pixellated light-emitting diodes (micro-LEDs) are a novel format of light source capable of generating micro-scale, spatially and temporally-controllable light patterns. These devices consist of arrays of LED pixels with diameter in the range 1 µm to 100 µm and emit light across the ultraviolet-blue-green-red part of the spectrum. In addition, compared with conventional broad-area LED devices, micro-LEDs show improved device performance in many aspects, such as high output power densities and the capability to withstand high injection current densities. For these reasons, micro-LEDs allow the study of interesting LED properties in regimes not accessible to conventional broad-area LEDs and also a wide range of novel LED applications.

 

This presentation focuses on the novel applications of micro-LEDs on visible light communication (VLC) and micro-display. Other work reported here includes using micro-LEDs for data transmission in polymer optical fibre and investigating the modulation characteristics of colour converters such as colloidal quantum dots and light-emitting polymer. A detailed study on size-dependent capacitance, especially the negative capacitance effect, in III-nitride micro-LEDs has also been reported in this presentation.

 

 

Biography

2010.10- Ph.D Student in physics (Photonics) (Supervisor: Dr Erdan Gu, Prof. Martin M.D. Dawson)

Institute of Photonics, University of Strathclyde (Glasgow, UK)

（1）Involved in Engineering and Physical Sciences Research Council (EPSRC) funded project “Hybrid organic semiconductor / gallium nitride / CMOS smart pixel arrays” (HYPIX). This £3.8 million project was completed via the cooperation between Institute of Photonics, University of Strathclyde and other academic partners, including Imperial College, London, University of Edinburgh, University of St Andrews, and University of Glasgow. My research area in this project focused on the various applications of micro-scaled optoelectronic devices, including smart micro-display system, on-chip multiple input multiple output optical wireless communication system, visible light communications system based on inorganic optoelectronic devices and colour-conversion materials. In addition, I also investigated the modulation characteristics of novel colour-conversion materials within the ‘HYPIX’ project. These materials include conjugated polymers and II-VI quantum dots. (Website: http://hypix.photonics.ac.uk/)

（2）Currently being involved in EPSRC funded project “Ultra Parallel Visible Light Communications” (UPVLC). This £4.6 million project was cooperated with University of Oxford, University of Cambridge, University of Edinburgh and University of St Andrews. My research in this area focused on fabrication and application of CMOS-interfaced micro-LED device for multiple input multiple output optical wireless communication system. (Website: http://up-vlc.photonics.ac.uk/)

（3）Published six peer-reviewed papers on internationally renowned academic journals (IEEE Photonics Journal, Journal of Lightwave Technology, Journal of Applied Physics, Applied Physics Letters), including three first-author papers; Published thirteen papers at international conferences, including three first-author papers, and gave oral or poster presentations at these international conferences; invited as the reviewer for IEEE Photonics Journal, Journal of Lightwave Technology and Optics Letters; used to be a teaching assistant of the Physics department of the University of Strathclyde, helping instruct the second-year undergraduates with their physics experiments and correcting their reports.

 

2006.9-2010.8 Undergraduate (Supervisor: Prof Ping Wang)

Beijing Institute of Technology, Department of Electrical and Electronics engineering (China) Mainly research on the supporting structure of optoelectronic devices, published three papers at international conferences as co-authors.

 

Prize

Accepted as a PhD student of the Joint Laboratory of Advanced Optoelectronic Materials and Devices, State Key Laboratory, Wuhan University of Technology, China and Institute of Photonics, University of Strathclyde, U.K.; fully funded by the Joint Laboratory on living expenses (2011)

Chinese Government Award for Outstanding Self-financed Students Abroad (2013)

First prize for best presentation of first-year PhD students of the Physics Department of University of Strathclyde, 2 selected from 30 first-year PhD students (2011)

Excellent Volunteer Title for 2008 Beijing Olympic and Paralympics Games, and working as an interpreter for Mr Jizhong Wei, the chairman of International Volleyball Federation (2008)

Second and third class Scholarship for four consecutive years when studying at Beijing Institute of Technology (2006-2010)