TECH FOCUS PHOTOLUMINESCENCE
Photo finish
A look at the current market for photoluminescence technology and some of the latest products available
P
hotoluminescence is a process during which a molecule absorbs a photon
in the visible region in order to excite one of its electrons to a higher electronic state. It then radiates a photon as the electron returns to a lower energy state. The technique can be used to
measure the purity and crystalline quality of semiconductors, as well as quantification of the amount of disorder present in a system. In many cases photoluminescence carries valuable information that can facilitate sample analysis and augment Raman data. As a subset of
photoluminescence, fluorescence imaging is applied in biological sciences, where fluorescent tags are used to reveal the presence
46 Electro Optics November 2022
and distribution of molecular species. Photoluminescence is also used to study crystal defects, such as atomic vacancies and substitutions, which is important when it comes to materials such as diamond and silicon carbide.
Commercial
products Vendors of photoluminescence products and equipment include Avantes, which has developed a fluorescence bundle for challenging setups that arise due to the height of fluorescent emission. The AvaSpec- HS2048XL-EVO offers high sensitivity, while the AvaLight- HPLED series provides excitation at the required wavelength.
Typical applications include dye identification, fluorescent lamps, diagnoses of malignancies and fluorescent labelling. Edinburgh Instruments’ FLS1000 photoluminescence spectrometer is a modular fluorescence and phosphorescence spectrometer used to measure spectra from the ultraviolet to the mid-infrared spectral range (up to 5,500nm), and lifetimes spanning from picoseconds to seconds. The large sample chamber will house practically any type of sample accessory and it has a guaranteed sensitivity of >35,000:1 for the standard water Raman measurement using the SQRT. Hamamatsu Photonics
developed the Quantaurus as
a compact, easy-to-use system with a small footprint based on the company’s established C9920-02,-02G/03,-03G systems for measuring absolute photoluminescence quantum yields. Operation is designed to be simple; the user can load a sample and press the start button to measure the photoluminescence quantum yields, excitation wavelength dependence, photoluminescence excitation spectrum and other properties in a short time. Horiba’s photoluminescence- optimised series of spectrophotometers are used in fluorescence spectrometers, Raman spectrometers and the firm’s custom optical solution systems. By combining Raman
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