Photoluminescence

Photoluminescence (PL) spectroscopy is a widely used technique for the characterization of the optical and electronic properties of semiconductors and molecules. PL is a process of light emission from any form of matter after the absorption of photons. The incident photon in the visible region excites one of its electrons to the excited state. And then, it radiates a photon as the electron return to the lower energy state. In quantum mechanics, the energy band is quantized, which means only certain transitions are allowed. Therefore, the discontinued energy peaks of luminescence are expected. The quality of samples can be normally determined by their full width at half maximum, and the relaxation process can be studied with time-resolved spectroscopy. It also can be combined with a microscope to observe single nanostructures or microscopic areas called micro-PL spectroscopy. The photon-phonon scattering can be subdued at cryogenic temperatures to have prominent signals.

Customer References:

1. Oleg Makarovsky, School of Physics and Astronomy, University of Nottingham, United Kingdom: Adv. Optical Mater., 2100104 (2021).

2. Chiara Ciccarelli, Cavendish Laboratory, University of Cambridge, United Kingdom: SCIENTIFIC VIDEO PROTOCOLS (2020).

3. Daniel Wasserman, Electrical and Computer Engineering, Microelectronics Research Center, University of Texas at Austin, USA: Infrared Physics and Technology 109, 103390 (2020); Nat Commun 10, 1625 (2019).

4. Sayantani Ghosh, Department of Physics, University of California, Merced, USA: J. Chem. Phys. 151, 154705 (2019); J. Phys. Chem. Lett., 8, 5378-5384 (2017).

5. Christopher Homes, Brookhaven National Laboratory, USA: Applied Optics, 32, 2976-2983 (1993).

OEM: PicoQuant, FluoTime 250 Cryo-PL

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