Determination of Chromaticity Coordinates and Bandgaps of III-V LEDs Using Electroluminescence Spectroscopy

Edinburgh Instruments
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FS5 Spectrometer

In 1907 English engineer Henry Joseph Round was testing the rectifying current behaviour of SiC crystallites and noticed that a faint yellow light was emitted from the SiC; this was simultaneously the first reported observation of the phenomena of electroluminescence spectroscopy and the first successful operation of a light emitting diode (LED). The work of Round was expanded on by a few others in the early 20th century, but it would take many decades for LEDs to become efficient enough for practical use.

In this application note the FS5 Spectrofluorometer, equipped with the electroluminescence accessory, is used to investigate the emission properties of four type III-V LEDs and determine their bandgaps and chromaticity coordinates.

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Electroluminescence spectra of InGaN and AIGaInP LEDs
Electroluminescence spectra of InGaN and AIGaInP LEDs

Recorded using the FS5 Spectrofluorometer, showing the peak wavelengths and FWHM of the emission.

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