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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.

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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

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.

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