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Related Concept Videos

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...
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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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Radical Photochromism-Induced Phosphorescence Enhancement for Dynamic Anticounterfeiting.

XinYi Tian1, ShanShan Wu1, GongHe Li1

  • 1Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface, and College of Science, Hebei University of Science and Technology, Yuhua Road 70, Shijiazhuang 050080, P. R. China.

ACS Macro Letters
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New smart materials combine photochromism and room-temperature phosphorescence (RTP). This study demonstrates enhanced RTP through photochromic reactions, enabling advanced optical applications and multilevel information encryption for anticounterfeiting.

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Area of Science:

  • Materials Science
  • Photochemistry
  • Supramolecular Chemistry

Background:

  • Stimuli-responsive materials with photochromism and room-temperature phosphorescence (RTP) are crucial for optical applications.
  • A significant challenge lies in promoting RTP emissions via photochromic processes.
  • Existing methods often face quenching effects, limiting performance.

Purpose of the Study:

  • To develop novel stimuli-responsive materials integrating photochromism and tunable RTP.
  • To investigate the mechanism of photochromism-enhanced RTP.
  • To demonstrate a practical application in information encryption.

Main Methods:

  • Supramolecular assembly of poly(acrylic acid) (PAA) with halogenated terpyridine derivatives (X-TPY).
  • Characterization of photochromic behavior via radical generation/interaction.
  • Measurement of RTP properties, including afterglow duration.

Main Results:

  • Composite materials (X-TPY@PAA) exhibited enhanced RTP with tunable afterglow durations (1.0–5.0 s).
  • Photochromic reactions unexpectedly enhanced RTP afterglow, avoiding quenching.
  • Demonstrated a multilevel information encryption system leveraging these dual functionalities.

Conclusions:

  • A facile strategy for constructing photochromism-enhanced RTP materials was established.
  • Radical photochromism can controllably enhance phosphorescence, offering dynamic anticounterfeiting solutions.
  • The developed materials show promise for advanced optical data storage and security.