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Chromatic delay in light emitting diodes.

W S Holden, W M Hubbard, S D Personick

|February 4, 2010

Summary

This summary is machine-generated.

Researchers discovered a novel effect in light emitting diodes (LEDs) called chromatic delay. This delay, occurring between different spectral components, impacts LED performance and sets a lower limit on achievable rise times.

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Area of Science:

Optoelectronics
Semiconductor Physics
Photonics

Background:

Modulating current in light emitting diodes (LEDs) causes a delay in optical signal response.
This delay has been observed to vary across different wavelengths within the LED's spectrum.

Purpose of the Study:

To investigate and quantify the phenomenon of chromatic delay in various types of LEDs.
To establish the magnitude of chromatic delay and its implications for device performance.

Main Methods:

Experimental measurements of chromatic delay were performed on several different LED devices.
The study focused on the relative delay between spectral components of the optical output.

Main Results:

A significant chromatic delay was observed, with delays on the order of 200-300 picoseconds between spectral half-power points.
This delay was measured across various types of light emitting diodes.

Conclusions:

Chromatic delay is a measurable effect in LEDs, impacting their response time.
This phenomenon establishes a fundamental lower limit on the achievable rise time for LED devices.