Absolute vs. relative efficiency: How efficient are blue LEDs, actually?

The absolute internal quantum efficiency (IQE) of indium gallium nitride (InGaN) based blue light-emitting diodes (LEDs) at low temperatures is often assumed to be 100%. However, a new study from University of Illinois Urbana-Champaign Electrical and Computer Engineering researchers has found that the assumption of always perfect IQE is wrong: the IQE of an LED can be as low as 27.5%.

Read Full Story

News | May 24, 2023


SEE: Unleashing the invisible world of wireless signals
SEE: Unleashing the invisible world of wireless signals

Emerging applications such as smart cities, autonomous vehicles, or smart metaverse all rely on embedded systems that are engaging with the physical environment through sensors. Recent advances in wireless technologies present new promising possibilities to harness the wireless infrastructure in and around buildings and cities to act as a non-intrusive sensing platform. 

SEE: Finding Gas Pump Skimmers Using Mobile Phones
SEE: Finding Gas Pump Skimmers Using Mobile Phones

Card skimmers are small devices that can fit on top of real card readers at self-service terminals such as gas pumps or ATMs. They easily blend in with the machine, making them hard to spot. Associate Professor Kirill Levchenko and graduate student Maxwell Bland are part of a team of computer scientists who developed an app enabling state and federal inspectors to detect card skimmers installed in gas pumps or ATMs.

SEE: New directions in computer chip design
SEE: New directions in computer chip design

In this lecture, we'll talk about some chips our lab has developed that are built on plastic – they can roll, they can bend, and they may cost less than a penny. We are using these chips to enable new applications and hit new benchmarks in cost, performance, and energy efficiency.

See more videos

Resonance Fall 2018


Resonance is published twice a year for alumni and friends of the department.


Media Contacts

Director of Constituent Engagement
1066 ECE Building
(217) 333-5943

Have a news story idea?

Submit your News Story

The Illinois ECE news item submission form will help increase the visibility of Illinois ECE. Submissions can include ongoing or published research, new funding, awards, student or faculty highlights, and anything else new and interesting in Illinois ECE. This could be for a press release, feature article, podcast, video, social media post, or the Illinois News Bureau.