Time-Resolved Electroluminescence Spectroscopy of a White Light Emitting Diode

Edinburgh Instruments
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FLS1000 Photoluminescence Spectrometer

One of the most powerful techniques to understand the behaviour and performance of electrical devices is electroluminescence spectroscopy. In electroluminescence (EL) spectroscopy a working device, such as a light emitting diode or solar cell, is placed inside a spectrometer and the light emission properties of the device studied. EL spectroscopy can be performed as either a steady state or time-resolved measurement.

In this application note the FLS1000 Photoluminescence Spectrometer is used to investigate the emission properties of a phosphor coated indium gallium nitride white light LED using both steady state and time-resolved electroluminescence spectroscopy.

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Time-resolved electroluminescence of white light InGaN LED.
Time-resolved electroluminescence of white light InGaN LED.

EL decay measured at 450 nm and 750 nm using TCSPC. The EL decay at 750 nm was fit with a monoexpoential decay using Fluoracle, giving a lifetime of 65 ns. (b) Time-resolved electroluminescence emission spectrum measured using TCSPC.

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