Shuji Nakamura obtained B.E., M.S., and Ph.D. degrees in Electrical Engineering from the University of Tokushima, Japan in 1977, 1979, and 1994, respectively. He joined Nichia Chemical Industries Ltd in 1979.

In 1993 and 1995 he developed the first group-III nitride-based high-brightness blue and green light-emitting diodes (LEDs). He also developed the first group-III nitride-based violet laser diodes (LDs) in 1995.

Since 2000, he has been a professor of Materials and Electrical & Computer Engineering at the University of California, Santa Barbara. He is the 2014 Nobel Laureate in Physics for the invention of the efficient blue light-emitting diode which has enabled bright and energy-saving white light sources.

2014 Nobel Laureate in Physics

Shuji Nakamura, Ph.D.

LECTURES

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Reserved seats will only be held up until 15 minutes prior to the start of each lecture. Early submission recommended for reserved seating. Detach this card and send registration to: UW-L Foundation Inc. Cleary Alumni & Friends Center P.O. Box 1148 La Crosse, WI 54602-1148 USA 608.785.6803 Fax 608.785.6868 email: foundation@uwlax.edu

Physics Seminar Development of InGaN/GaN Light Emitting Diodes (LEDs) and Laser Diodes for Energy Efficient Lighting and DisplaysLEDs fabricated from indium gallium nitride (InGaN) have led to the realization of high-efficiency white solid-state lighting. Currently, InGaN white LEDs exhibit luminous efficacy greater than 150 lm/W, and wall-plug efficiencies higher than 60%. This has enabled LEDs to compete with traditional lighting technologies such as incandescent and compact fluorescent lighting (CFL). Further improvements in materials quality and cost reduction are necessary for widespread adoption of LEDs for lighting. Tunnel junction (TJ) was used to improve the light extraction efficiency and the p-type contact in order to reduce the operating voltage of the LEDs. Peak wall-plug efficiency as high as 70% have been achieved. A review of the unique polarization anisotropy in GaN is included for the different crystal orientations. Emphasis on semipolar LEDs will highlight high-power violet and blue emitters and considers the effects of indium incorporation and polarization. Semipolar GaN materials have enabled the development of high-power blue lasers. Laser light sources show great promise for directional white illumination with efficiency as high as 87lm/W.

This publication was funded by the University of Wisconsin-La Crosse Foundation Inc.

Public Lecture The Invention Of High Efficient Blue LEDs And Future LightingIn the 1970s and 80s, a lack of suitable materials left efficient blue and green light-emitting diodes (LED) as the last missing elements for solid-state display and lighting technologies. By that time, III-nitride alloys were regarded as the least likely candidates due to various “impossible” difficulties. However, a series of unexpected breakthroughs in 1990’s totally changed peoples’ views. The first high-efficiency blue LEDs were invented and commercialized at the same time in 1993. Nowadays, III-nitride-based LEDs have become the most widely used light source in many applications. LED light bulbs have more than ten times the efficiency of incandescent bulbs, and they last for 50 years! At their current adoption rates, by 2020, LEDs can reduce the world’s need for electricity by the equivalent of nearly 60 nuclear power plants. The history of the invention of blue LED and future uses of their lighting will be described.

Distinguished Lecture Series in PHYSICS

Thursday, Oct. 13, 2016 PUBLIC LECTURE

5 p.m. The Invention Of High Efficient Blue LEDs And Future Lighting Skogen Auditorium A Room 1400 Centennial Hall

Friday, Oct. 14, 2016

PHYSICS SEMINAR

3:20 p.m. Development of InGaN/GaN Light Emitting Diodes (LEDs) and Laser Diodes for Energy Efficient Lighting and Displays Skogen Auditorium A Room 1400 Centennial Hall

All events are open to the public, but we suggest large groups make arrangements in advance by filling out and sending in the attached form. Reserved seats will only be held up until 15 minutes prior to the start of each lecture.

Groups of five or more must make special arrangements with the Foundation.

If parking on campus, please use the metered parking stalls.

For further information contact:

www.uwlax.edu/physicsGubbi Sudhakaran, Ph.D., Physics DepartmentUniversity of Wisconsin-La Crosse 1725 State St. | La Crosse, WI 54601 USA608.785.8431email: gsudhakaran@uwlax.edu

October 13-14, 2016

October 13-14, 2016

The UWL Physics Department, with 160 majors, is one of the largest undergraduate physics programs in Wisconsin. The department has 13 full-time faculty and offers a B.S. in physics with the options of emphases in astronomy, computational physics and optics, as well as physics majors with business, bio-medical or secondary education concentrations. The department has a dual-degree program (physics and engineering) in cooperation with the engineering programs at UW-Milwaukee, UW-Madison, UW-Platteville and the University of Minnesota. The department is active in undergraduate research, its faculty and students regularly publish their work in peer-review journals and give presentations at meetings and conferences. The department was profiled as a successful undergraduate program for the National Task Force on Undergraduate Physics report, which is available at www.aapt.org/Programs/projects/spinup/upload/Final-Case-Studies.pdf, and was featured on the cover of the September 2003 issue of Physics Today. The department was awarded the 2004 UW Regents Teaching Excellence Award for Academic Departments and Programs. The American Physical Society has recognized the department as the 2013 Improving Undergraduate Physics Education Award, one of only four such awards granted annually.

For more information on UWL’s physics department, visit our website at www.uwlax.edu/physics.

The UWL Distinguished Lecture Series in Physics is funded by private gifts to the UW-La Crosse Foundation Inc. and through support from the Department of Physics, the College of Science and Health and Wettstein’s. The series annually brings to La Crosse a physicist whose significant accomplishments and communication skills can inspire and enrich the careers of students, faculty and the community.

2014 Nobel Laureate

Shuji NakamuraCo-sponsored by the

University of Wisconsin-La Crosse Foundation Inc.,

Department of Physics

College of Science and Health

Wettstein’s

Distinguished Lecture Series in PHYSICS

Distinguished Lecture Series in PHYSICS