A light-emitting diode (LED) is a light source (semiconductor), used in many every-day applications and specifically in fluorometry. LEDs are available for specific spectral ranges across wavelengths in the visible, ultraviolet, and infrared range.
MitoPedia O2k and high-resolution respirometry: O2k hardware
- 50 years before introduction of the O2k-Fluorescence LED2-Module at the O2k-Fluorescence Workshop, 15-16 March 2012: 'The first practical visible-spectrum (red) LED was developed in 1962 by Nick Holonyak - the "father of the light-emitting diode".' Wikipedia retrieved 2012-02-29.
- 'Today’s LEDs, which come in several colors, evolved from Holonyak’s seminal work in 1962. At a time when other researchers focused on infrared light, Holonyak invented a method to synthesize gallium arsenide phosphide (GaAsP) crystals, which exhibited wavelengths in the visible spectrum. Using this "tunable" alloy, Holonyak crafted the first practical LED in 1962 (the red LED). “I wanted to work in the visible spectrum where the human eye sees, and everybody else was working in the infrared,” remarked Holonyak.' - "Nick Holonyak, Jr. 2004 Lemelson-MIT Prize Winner". Lemenson-MIT Program. Retrieved 2012-02-29