Photoluminescence (PL) is an important analysis method in material/semiconductor sciences and optoelectronics. In the infrared spectral range the sensitivity of the FTIR technique is significantly higher than for dispersive spectrometers. Bruker has decades of experience offering powerful PL solutions with the FTIR research spectrometers.
For NIR PL the weak atmospheric absorptions of water vapor and CO2 are not a big issue, so vacuum FTIR spectrometers are not necessarily required. In the MIR region two additional challenges occur for PL experiments. First, atmospheric absorption is significantly stronger. Since PL measurements typically mean single channel spectroscopy there is no reference measurement to compensate the main part of atmospheric artifacts. Secondly, the LN2 cooled PL detector is sensitive to the MIR 300 K thermal background radiation, which will mask weak MIR PL signals. On account of this, amplitude modulated step scan must be used to get rid of the disruptive thermal background contribution.
|Read Application Note AN 134|