Micro-photoluminescence Technique
Micro-photoluminescence Technique - Related Videos
01:14
Photoluminescence: Applications
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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...
22:38
Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
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Cited by 4 •
2007
The fabrication of microfluidic channels and their implementation in experiments for studying the chemotactic foraging behaviour of marine microbes within a patchy nutrient seascape and the swimming behaviour of bacteria within shear flow are described.
02:53
Developing a Micro-Tissue-Engineered Neural Network Using a Hydrogel-Based Micro-column
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2025
Source: Struzyna, L. A. et. al., Anatomically Inspired Three-dimensional Micro-tissue Engineered Neural Networks for Nervous System Reconstruction, Modulation, and Modeling. J. Vis. Exp. (2017)This video demonstrates the development of micro-tissue-engineered neural networks using a hydrogel micro-column with an extracellular matrix core. Seeded neuronal aggregates adhere, extend projections, and form structured neural networks, contributing to advancements in neurodevelopment and...
08:43
Pneumatically Driven Microfluidic Platform for Micro-Particle Concentration
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Cited by 3 •
2022
The present protocol describes a pneumatic microfluidic platform that can be used for efficient microparticle concentration.
FAQs
The excitation light supplies energy that generates electron-hole pairs within the illuminated microscopic region. When these carriers recombine radiatively, they release photons whose properties reflect the local electronic and optical environment. Measuring that emitted light therefore connects carrier recombination behavior with material characteristics, allowing localized regions to be examined rather than treating the entire sample as uniform.
Each measurement describes a different aspect of the emitting region. The spectrum helps reveal local band-gap variations and related optical differences, intensity indicates changes in emission strength, and spatial distribution shows where those features occur. Combining them distinguishes localized behavior from broader sample trends, which is particularly useful for examining nonuniform semiconductors, nanostructures, and defect-containing materials.
A focused laser or other light source restricts excitation to a microscopic area, preserving information about local variations in the material. Moving or selecting different regions can therefore expose changes in composition, strain, defects, or carrier behavior across a sample. The resulting spatial resolution is central to evaluating structures whose properties may differ substantially over short distances.
The measurement begins by directing focused optical excitation onto a selected microscopic region. The generated electron-hole pairs produce radiative emission, which is then collected from that location. Finally, the emitted light is analyzed through its spectrum, intensity, and spatial distribution. These linked steps convert local optical emission into information about the material and its electronic behavior.
Engineers would choose this technique when localized information is important, such as when assessing semiconductor regions, quantum wells, nanostructures, or defects. Its spatially resolved measurements can identify variations that a sample-wide result could obscure. This makes it useful for investigating nonuniform materials and for relating microscopic optical behavior to the performance or consistency of engineered devices.
Measurements can reveal band-gap variations, strain, composition, defects, and carrier behavior in device materials. Engineers can apply this information when developing or evaluating light-emitting diodes, lasers, photodetectors, and emerging nanoscale technologies. Comparing localized emission characteristics across a structure helps identify material or fabrication variations that may influence optical operation and device consistency.