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Related Concept Videos

Photoluminescence: Applications01:14

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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...
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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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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.
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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
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Soft, Stretchable, and Pneumatically Triggered Thermochromic Optical Filters with Embedded Phosphorescence.

Yang Jin1,2, Neil Baugh1, Yiliang Lin1

  • 1Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States.

ACS Applied Materials & Interfaces
|May 12, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed soft composite "optical filters" to control light emission from phosphorescent materials. These devices allow tunable color, intensity, and wavelength, enabling new applications in stretchable electronics and soft robotics.

Keywords:
controlled phosphorescenceliquid metalrare-earth luminescent materialsresponsive materialssoft robotsthermochromic

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Soft Robotics

Background:

  • Phosphorescence is a natural light emission phenomenon, but controlling its release post-activation is challenging.
  • Existing methods for activating phosphorescence lack precise control over light emission once initiated.

Purpose of the Study:

  • To create soft composite devices for controlled phosphorescence emission.
  • To develop a tunable optical filter system using a stretchable matrix.

Main Methods:

  • Fabrication of soft composite "optical filters" with liquid metal wires, phosphorescent particles, and thermochromic pigments in an elastomeric matrix.
  • Activation of phosphorescence using UV light.
  • Control of light release via Joule heating of liquid metal to alter thermochromic pigment opacity.
  • Mechanical deformation of the matrix to induce optical responses.

Main Results:

  • Demonstrated tunable color, intensity, and wavelength of phosphorescence by controlling thermochromic pigment opacity through Joule heating.
  • Showcased conversion of mechanical forces (strain, compression, inflation) into optical responses via changes in liquid metal resistance.
  • Successfully integrated controlled phosphorescence with electrical conductivity in a soft, stretchable matrix.

Conclusions:

  • Developed novel soft composite "optical filters" for dynamic control of phosphorescence.
  • The technology enables tunable light emission and mechanical-to-optical signal conversion.
  • Potential applications include electronic skin for soft robotics, advanced prosthetics, and stretchable electronic devices.