Photoluminescence (PL) is commonly used for investigating semiconductors that can be studied at room temperature. At low temperatures, spectral lines are sharper and more intense, revealing more structure. Also excitations normally masked by the high thermal phonon background at room temperature become observable at low temperatures. Oxford Instruments' optical cryostats are used to study photoluminescence - the type of cryostat will depend on your requirements in terms of sample environment (vacuum or exchange gas), cooling technology (nitrogen, helium or Cryofree) and whether you are doing macro-PL or micro-PL. 

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