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| Photoluminescence | |
|---|---|
| Name | Photoluminescence |
| Field | Optics; Solid-state physics; Chemical physics |
| Related | Fluorescence; Phosphorescence; Electroluminescence |
Photoluminescence Photoluminescence is an optical emission process in which a material absorbs photons and re-emits photons, producing luminescence observable across ultraviolet, visible, and infrared bands. Its study intersects experimental methods and theoretical models developed in laboratories, observatories, and industrial research centers, and it supports characterization techniques used by companies, national laboratories, and academic institutions. Photoluminescence underpins technologies ranging from lighting and displays to biomedical imaging and semiconductor device testing.
Photoluminescence arises when electronic excited states created by photon absorption relax radiatively, and it is distinct from Incandescence, Triboluminescence, Chemiluminescence, Bioluminescence, and Electroluminescence in excitation mechanism. Early experimental observations trace to investigations contemporaneous with work at institutions such as Royal Institution, University of Cambridge, École Normale Supérieure, and industrial research by entities like Bell Labs and General Electric. Foundational theoretical contributions came from figures associated with Royal Society, Max Planck Institute for Solid State Research, and university groups linked to Harvard University and Massachusetts Institute of Technology.
Photoluminescence involves electronic band structures and localized states described in models developed by researchers at Cavendish Laboratory, Rutherford Appleton Laboratory, and Institut Laue–Langevin. The process is analyzed using quantum mechanics frameworks attributed to investigators from University of Göttingen, University of Vienna, and Princeton University. Key physical concepts draw on works associated with Niels Bohr, Erwin Schrödinger, and Werner Heisenberg as applied in modern contexts like Los Alamos National Laboratory and National Institute of Standards and Technology. Carrier dynamics, recombination pathways, and excitonic effects are modeled in collaborations among groups at Stanford University, University of California, Berkeley, and California Institute of Technology.
Mechanistic classifications include fast radiative relaxation analogous to phenomena studied at Royal Society of Chemistry centers, and long-lived delayed emission paralleling investigations at Max Planck Society facilities. Fluorescence and phosphorescence are distinguished in texts produced by scholars affiliated with University of Oxford, University of Cambridge, and Sorbonne University. Defect-related luminescence, impurity centers, and trap-mediated recombination have been explored in projects at Argonne National Laboratory, Oak Ridge National Laboratory, and Sandia National Laboratories. Mechanisms in low-dimensional systems were advanced by teams at University of Manchester, University of Illinois Urbana–Champaign, and Indian Institute of Science.
Spectroscopic modalities for photoluminescence are implemented in instruments developed by companies like Thermo Fisher Scientific and Agilent Technologies and employed in laboratories at European Organization for Nuclear Research and SLAC National Accelerator Laboratory. Techniques include steady-state and time-resolved spectroscopy, time-correlated single-photon counting pioneered in collaborations involving Bell Labs and IBM Research, as well as microscopy platforms from Carl Zeiss AG and Olympus Corporation. Cryogenic PL, temperature-dependent studies, and in situ measurements are routine at facilities such as Lawrence Berkeley National Laboratory, Fermi National Accelerator Laboratory, and specialized centers like Scripps Research.
Photoluminescence characterizes semiconductors produced by companies and universities including Intel Corporation, Samsung Electronics, and Toshiba Corporation and is critical for research at National Renewable Energy Laboratory, Imperial College London, and ETH Zurich. Applications span light-emitting diodes developed by groups at Osram Licht AG and Philips, quantum dot technologies advanced by teams at University of Toronto and University of Washington, and organic optoelectronics researched at Princeton University and Columbia University. Biomedical imaging applications link to work at Mayo Clinic, Johns Hopkins University, and Memorial Sloan Kettering Cancer Center, while photovoltaic characterization connects to projects at Fraunhofer Society, BP Solar, and First Solar.
Spectral line shapes, peak positions, and linewidth analysis draw on methods established in spectroscopy traditions from Royal Society, American Physical Society, and Institute of Physics. Data interpretation often uses models refined by collaborations among Los Alamos National Laboratory, Brookhaven National Laboratory, and Kavli Institute for Theoretical Physics. Techniques for deconvolution and fitting are implemented in software used at Microsoft Research, Google Research, and academic centers like Duke University. Spectral mapping and hyperspectral imaging are applied in projects at NASA, European Space Agency, and satellite instrument groups associated with Jet Propulsion Laboratory.
Quantum efficiency, nonradiative recombination, and surface recombination velocities are affected by fabrication and processing practices employed at Applied Materials, ASM International, and facilities at Tokyo Institute of Technology. Environmental factors such as temperature and atmosphere have been characterized in experiments at National Physical Laboratory (United Kingdom), Physikalisch-Technische Bundesanstalt, and Korea Advanced Institute of Science and Technology. Strategies for passivation and defect control originate from collaborations including Samsung Advanced Institute of Technology, Intel Labs, and Nikon Corporation laboratories.