The December 2022 issue of IEEE Spectrum is here!

Close bar

Explaining LEDs' Diminishing Returns

New concept pulls popular theories together, drives researchers apart

3 min read
Explaining LEDs' Diminishing Returns

Photo: Luis Molina/iStockphoto

The LED community is ensnared in a long-running and contentious debate over the origin of a phenomenon called droop, the decline in the efficiency of blue and white emitters as their current is cranked up. Solving this mystery will enable the design of droop-busting LED architectures that will make brighter, cheaper solid-state lighting.

Keep Reading ↓Show less

This article is for IEEE members only. Join IEEE to access our full archive.

Join the world’s largest professional organization devoted to engineering and applied sciences and get access to all of Spectrum’s articles, podcasts, and special reports. Learn more →

If you're already an IEEE member, please sign in to continue reading.

Membership includes:

  • Get unlimited access to IEEE Spectrum content
  • Follow your favorite topics to create a personalized feed of IEEE Spectrum content
  • Save Spectrum articles to read later
  • Network with other technology professionals
  • Establish a professional profile
  • Create a group to share and collaborate on projects
  • Discover IEEE events and activities
  • Join and participate in discussions

The Transistor at 75

The past, present, and future of the modern world’s most important invention

2 min read
A photo of a birthday cake with 75 written on it.
Lisa Sheehan
LightGreen

Seventy-five years is a long time. It’s so long that most of us don’t remember a time before the transistor, and long enough for many engineers to have devoted entire careers to its use and development. In honor of this most important of technological achievements, this issue’s package of articles explores the transistor’s historical journey and potential future.

Keep Reading ↓Show less