Keeping Dye Molecules Apart Leads to Bright Fluorescent Materials

  • Author: ChemistryViews.org
  • Published: 16 August 2020
  • Copyright: Wiley-VCH GmbH
  • Source / Publisher: Chem/CellPress
thumbnail image: Keeping Dye Molecules Apart Leads to Bright Fluorescent Materials

Fluorescent compounds have applications, e.g., in organic LEDs (OLEDs). While fluorescent dyes often have useful optical properties, using them to make solid optical materials is challenging. This is due to electronic coupling between them in the solid state that quenches their emission. Decoupling the dye molecules could lead to an entirely new class of bright fluorescent solid materials.


Bo W. Laursen, University of Copenhagen, Denmark, Amar H. Flood, Indiana University, Bloomington, USA, and colleagues have developed such a class of fluorescent materials, which the team calls small-molecule ionic isolation lattices (SMILES). The researchers made the materials by mixing cationic dyes with an ion-binding macrocycle. The dye can, e.g., be rhodamine 3B perchlorate (dye cation pictured in blue, anion pictured in red), which is combined with two equivalents of the anion-binding macrocycle cyanostar (pictured in black).


During crystallization, the macrocycles form a sandwich-type arrangement with the anion. The resulting disc-shaped structures act as spacers between the dye molecules and decouple them electronically in the solid state. The cyanostar–anion complexes are colorless and have wide bandgap, which allows them to efficiently isolate the dye molecules from each other. The team used this principle to prepare fluorescent solids from a wide variety of commercially available cationic dyes. The resulting SMILES-type materials can be blended into different polymers while retaining their emission.


 

 

Article Views: 2302

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission and consult our permisson guidance prior to making your request

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH