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Related Concept Videos

Stereoisomerism02:52

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Chirality02:25

Chirality

Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...

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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
10:33

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Published on: February 27, 2019

Metal-Organic Flexible Glasses Deliver Time-Chirality-Color Multi-Dimensional Photonic Switches.

Chang Xing1, Dongpeng Yan1, Wei-Hai Fang1

  • 1Institute for Advanced Study, Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, People's Republic of China.

Angewandte Chemie (International Ed. in English)
|July 8, 2026
PubMed
Summary

Researchers developed novel metal-organic hybrid photonic glasses for flexible optical fibers. These glasses offer tunable colors and room-temperature phosphorescence, overcoming limitations of traditional materials.

Keywords:
active waveguidecircular polarized luminescencemetal‐organic glassesphotochromismroom‐temperature phosphorescence

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Published on: December 11, 2014

Area of Science:

  • Materials Science
  • Optics
  • Chemistry

Background:

  • Active optical waveguides face challenges in color tunability and processability due to material limitations like brittleness.
  • Conventional crystalline materials have short excited-state lifetimes, hindering advanced photonic applications.

Purpose of the Study:

  • To introduce a new class of metal-organic hybrid (MOH) photonic glasses with enhanced processability and tunable optical properties.
  • To achieve simultaneous time-, space-, and color-resolved photonic capabilities, including circularly polarized room-temperature phosphorescence (CPR) and reversible photochromism.

Main Methods:

  • Evaporation-induced self-assembly strategy for fabricating MOH photonic glasses.
  • Spectroscopic characterization and theoretical analysis to investigate CPR and photochromism mechanisms.
  • Fabrication of large-scale, flexible core-cladding optical fibers.

Main Results:

  • The MOH photonic glasses exhibit bright green CPR with dynamically tunable emission color across a broad spectral range via photochromic switching.
  • Efficient suppression of non-radiative transitions, attributed to intermolecular interactions, leads to strong CPR.
  • Photochromism originates from photoinduced radical generation, enabling reversible color changes.

Conclusions:

  • The developed photonic glasses offer a general design principle for processable materials unifying molecular design and fiber engineering.
  • These materials pave the way for next-generation flexible photonic technologies, including photonic memory systems and integrated photonic circuits.