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Photoluminescence: Fluorescence and Phosphorescence01:23

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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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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 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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Programmable Persistent Room Temperature Phosphorescence Switches through Wavelength-Selective Photoactivation.

Yuchang Wang1, Aiwen Shao1, Jiangang Li1

  • 1State Key Laboratory of Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM) & Institute of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications (NUPT), 9 Wenyuan Road, Nanjing, 210023, P. R. China.

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Summary

Researchers developed a novel wavelength-selective system for multicolor persistent room-temperature phosphorescence (RTP) control. This breakthrough enables programmable afterglow colors and rewritable multicolor images via light, advancing optical data storage and smart displays.

Keywords:
Förster resonance energy transferRoom temperature phosphorescenceTriplet-triplet energy transferWavelength-selective photoactivationphotoswitch

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Area of Science:

  • Materials Science
  • Photochemistry
  • Optoelectronics

Background:

  • Controlling multicolor persistent room-temperature phosphorescence (RTP) with light is crucial but challenging.
  • Existing methods lack precise wavelength selectivity for programmable luminescence switching.

Purpose of the Study:

  • To engineer a wavelength-selective photoresponsive system for multicolor RTP.
  • To demonstrate programmable control over afterglow colors and rewritable multicolor imaging.

Main Methods:

  • Utilized Förster resonance energy transfer (FRET) between a photoactivated donor and a photoswitch acceptor.
  • Integrated materials to achieve distinct afterglow states (nonemissive, green, yellow, orange) upon specific UV irradiation wavelengths (400 nm, 365 nm, 254 nm).
  • Developed an interacting network for multistate afterglow color switching.

Main Results:

  • Achieved distinct, controllable afterglow colors (nonemissive, green, yellow, orange) via selective photoirradiation.
  • Demonstrated a programmable persistent luminescence switching system.
  • Successfully performed photo-controlled rewritable printing of multicolor afterglow images on a single film.

Conclusions:

  • The engineered system offers sophisticated wavelength-selective photoresponsive capabilities.
  • This technology has significant potential for applications in optical data storage, security labeling, and smart displays.
  • Precise control over photoresponsive behaviors under various wavelengths is now achievable.