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Photoluminescence: Applications01:14

Photoluminescence: Applications

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...
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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...

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Related Experiment Video

Updated: May 8, 2026

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators
12:04

Microfluidic Preparation of Liquid Crystalline Elastomer Actuators

Published on: May 20, 2018

Luminescent elastomeric Janus particles.

F L Faita1, A C Trindade, M H Godinho

  • 1Departamento de Física, Universidade Federal de Santa Catarina, 88040-900 Florianópolis-SC, Brazil.

Journal of Colloid and Interface Science
|September 10, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a simple method to create luminescent elastomeric particles with unique shapes. This technique uses UV light to alter fluorescent spheres, controlling their morphology and optical properties for potential applications.

Keywords:
ElastomerJanus particlesLuminescence

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Developing functional micro/millimeter-sized particles is crucial for various applications.
  • Controlling particle morphology and optical properties is a key challenge in materials synthesis.

Purpose of the Study:

  • To present a low-cost, low-tech method for preparing luminescent elastomeric particles with asymmetric morphology.
  • To demonstrate control over particle surface features and optical characteristics.

Main Methods:

  • Fabrication involved UV-irradiating soft urethane/urea fluorescent spheres incorporating tris(8-hydroxyquinolinato)aluminum (Alq3).
  • Particles were subsequently extracted in toluene and dried, inducing surface wrinkling.
  • Morphology and optical properties were characterized using SEM, AFM, optical microscopy, and UV-Vis spectrophotometry.

Main Results:

  • Asymmetric micro- and millimeter-sized elastomeric particles with controllable wrinkled surfaces were successfully prepared.
  • Spatial periodicity of wrinkles correlated with UV irradiation time and Alq3 concentration.
  • Negligible leaching of the Alq3 compound was observed.

Conclusions:

  • The developed method offers a facile route to tunable luminescent elastomeric particles.
  • Non-covalent incorporation of Alq3 allows for independent control of particle morphology and fluorescence.
  • The technique holds promise for applications requiring functional micro/millimeter-scale materials.