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Related Concept Videos

Group Polarization01:01

Group Polarization

Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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...
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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Selection Rules: Photochemical Activation
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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...

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Related Experiment Video

Updated: Jul 4, 2026

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
08:49

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy

Published on: December 1, 2023

Highly Dissymmetric and Multicolor Circularly Polarized Organic Hyperafterglow.

Hui Li1, Fei Xu2, Zhenpeng Song2

  • 1State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, Nanjing, China.

Angewandte Chemie (International Ed. in English)
|July 2, 2026
PubMed
Summary

Researchers developed new circularly polarized organic afterglow (CPOA) materials for advanced applications. These materials offer high efficiency, long lifetimes, and pure colors, overcoming previous limitations in chiral optoelectronics.

Keywords:
cholesteric liquid crystalshighly dissymmetricinformation encodingmulticolororganic circularly polarized hyperafterglow

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Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera

Published on: December 27, 2018

Area of Science:

  • Materials Science
  • Organic Electronics
  • Photonics

Background:

  • Circularly polarized organic afterglow (CPOA) materials are crucial for applications like information encryption and 3D displays.
  • Achieving high efficiency, long lifetimes, color purity, and a large dissymmetry factor (glum) simultaneously in CPOA materials is challenging.

Purpose of the Study:

  • To propose an effective design strategy for high-performance circularly polarized hyperafterglow materials.
  • To develop multicolor narrowband CP-hyperafterglow polymeric films with enhanced photophysical properties.

Main Methods:

  • Integration of narrowband hyperafterglow polymers with cholesteric liquid crystal matrices.
  • Characterization of photoluminescence quantum yields, emission bandwidths, lifetimes, and dissymmetry factors.

Main Results:

  • Achieved multicolor narrowband CP-hyperafterglow emission with photoluminescence quantum yields up to 81%.
  • Exhibited emission bandwidths as narrow as ~40 nm and ultralong lifetimes up to 957 s.
  • Demonstrated maximum |glum| values of up to 1.3.

Conclusions:

  • The proposed strategy offers a simple and reliable route to high-performance CP-hyperafterglow materials.
  • The developed materials show potential for information encoding, multilevel encryption, and chiral displays.
  • Advances the development of chiral optoelectronic materials and their applications.