Photoluminescence Mapping
Photoluminescence Mapping - 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
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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...
06:58
Fate Mapping
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2023
Fate mapping is a technique used to understand how embryonic cells divide, differentiate, and migrate during development. In classic fate mapping experiments, cells in different areas of an embryo are labeled with a chemical dye and then tracked to determine which tissues or structures they form. Technological improvements now allow for individual cells to be marked and traced throughout embryonic development and adulthood. This video reviews the concepts behind fate mapping, and then details a...
11:03
Motor Maps
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2023
Source: Laboratories of Jonas T. Kaplan and Sarah I. Gimbel—University of Southern California One principle of brain organization is the topographic mapping of information. Especially in sensory and motor cortices, adjacent regions of the brain tend to represent information from adjacent parts of the body, resulting in maps of the body expressed on the surface of the brain. The primary sensory and motor maps in the brain surround a prominent sulcus known as the central sulcus. The cortex...
14:13
Coordinate Mapping of Hyolaryngeal Mechanics in Swallowing
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Cited by 35 •
2014
Coordinate mapping is a method of documenting salient features of hyolaryngeal biomechanics in the pharyngeal phase of swallowing. This methodology uses image analysis software to record coordinates of anatomical landmarks. These coordinates are imported into an excel macro and translated into kinematic variables of interest useful in dysphagia research.
FAQs
A focused light source supplies energy that excites electrons in the material. As excited carriers return toward lower-energy states, their recombination produces photoluminescence. Measuring that emitted response at different surface locations preserves spatial information, so engineers can connect local optical behavior with specific regions rather than relying on one average signal.
Intensity, wavelength, and lifetime provide different views of the same emitting material. Intensity maps show where emission is stronger or weaker, while wavelength changes can point to local band-structure, strain, or impurity differences. Lifetime maps add information about carrier recombination behavior. Using these observables separately helps distinguish spatial patterns that a single signal could conceal.
Spatially localized changes matter because material properties are not necessarily uniform across a device or sample. A region with unusual emission may indicate a local defect, composition change, strain variation, altered band structure, or different carrier recombination behavior. Mapping converts these differences into locations, allowing engineers to identify regions that may limit optoelectronic performance.
A measurement workflow starts by directing a focused light source onto the material, then recording the resulting photoluminescence at positions across the surface. The recorded values are assembled into spatial maps of intensity, wavelength, or lifetime. Engineers can then compare regions within the same sample to identify nonuniform optical behavior and relate patterns to material quality.
Photoluminescence Mapping supports engineering studies of semiconductors, solar cells, light-emitting diodes, and other optoelectronic materials. It can assist both material characterization and quality control by showing how emission varies across a surface. This spatial perspective helps evaluate composition and electronic quality while exposing local regions that may require attention during development or manufacturing.
Map variations provide feedback about where composition, electronic quality, defects, strain, or carrier recombination differ across a component. By locating these nonuniform regions, engineers can identify performance-limiting areas instead of treating the sample as homogeneous. The resulting spatial evidence can guide efforts to improve fabrication processes and assess whether material quality is becoming more consistent.