Photoluminescence Imaging
Photoluminescence Imaging - Related Videos
01:14
Photoluminescence: Applications
0 Views •
2024
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
01:23
Photoluminescence: Fluorescence and Phosphorescence
0 Views •
2024
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds. A pair of electrons in a...
12:21
Close-Space Sublimation-Deposited Ultra-Thin CdSeTe/CdTe Solar Cells for Enhanced Short-Circuit Current Density and Photoluminescence
0 Views •
Cited by 6 •
2020
This work describes the complete fabrication process of thin absorber cadmium selenium telluride/cadmium telluride photovoltaic devices for enhanced efficiency. The process utilizes an automated in-line vacuum system for close-space sublimation deposition that is scalable, from fabrication of small area research devices as well as large-scale modules.
09:50
Enhanced Photoluminescence of Curcuma longa Extracts via Chitosan-Mediated Energy Transfer for Textile Authentication Applications
0 Views •
Cited by 1 •
2023
Photoluminescence is one of the most effective authentication mechanisms being used today. Utilizing and enhancing naturally sourced materials with inherent photoluminescent properties and incorporating them into fabric substrates can lead to development of green, sustainable, and functional textiles for smart applications.
13:45
Hybrid µCT-FMT imaging and image analysis
0 Views •
Cited by 34 •
2015
We describe a protocol for hybrid imaging, combining fluorescence-mediated tomography (FMT) with micro computed tomography (µCT). After fusion and reconstruction, we perform interactive organ segmentation to extract quantitative measurements of the fluorescence distribution.
FAQs
Spatial differences in emitted light indicate that regions of the sample differ in chemical or physical properties. Excitation light promotes electrons to higher-energy states, and their return to lower-energy states generates the recorded signal. Mapping intensity, color, or lifetime across the image therefore connects local optical behavior with variations in molecular distribution, composition, defects, or other sample characteristics.
These measurements describe different aspects of the emission response. Intensity maps show where emission is stronger or weaker, color reveals differences in emitted wavelengths, and lifetime records how long emission persists. Examining these signals together can separate spatially varying materials or chemical environments and can provide additional context when combined with spectroscopy or time-resolved measurements.
Emission patterns do not only report where a material is located; they can also reflect how absorbed energy moves through the system before light is emitted. Combining spatial images with spectroscopy or time-resolved measurements helps clarify these energy-transfer pathways. That interpretation is valuable for relating local signals to molecular interactions, material behavior, and chemical changes.
The sample is illuminated with excitation light, and a camera records the resulting emission as spatially resolved data. Depending on the research question, the measurement can capture intensity, color, or lifetime. Researchers may then pair the image with spectroscopy or time-resolved measurements to connect spatial patterns with emission characteristics and energy-transfer behavior.
The method can visualize molecular distributions, reaction progress, defects, and compositional changes across solutions, surfaces, and solid materials. These applications allow researchers to examine where chemical conditions or material properties vary rather than relying only on a bulk measurement. The resulting spatial information can expose localized behavior that would otherwise be averaged across the sample.
Chemists use the approach to support work on sensors, catalysts, optoelectronic materials, and analytical assays. Its value comes from linking localized emission patterns with molecular or material changes, while spectroscopy and time-resolved measurements add information about emission and energy transfer. This combination supports the investigation and development of systems whose performance depends on spatially varying chemical or physical properties.