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Equipment

    16. Low Temperature steady-state photoluminescence (PL) setup 

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Technique 

A He flow cryostat in which the temperature can be varied from 4.2 to 300 K is used to measure the temperature evolution of PL spectra from different samples ranging from films, powders to single crystals. The sample is excited with a laser via a 550 μm core optical fiber. The PL spectra are collected through 11 optical fibers surrounding the excitation fiber during a cool down/warm up T ramp. The fibers are coupled to a LOT-QD Shamrock F/4 spectrometer with electron-multiplying charge-coupled detector (EMCCD) suited either for visible spectra or near infra-red (NIR) region.

Units

various continuous wave laser systems (365 – 1200 nm), flow cryostat, vacuum setup, spectrometers and EMCCD cameras (400-1200 nm detection range).             

Instrument type

Homemade

Complexity level

High

Applications

Follows the temperature evolution of the emission spectra of films/powders/single crystals excited via laser in the visible/NIR range in order to access their excitonic fine structure and charge carrier scattering mechanisms as well as carrier-phonon coupling strengths.