First Zeolitic Imidazolate Framework with Circularly Polarized Luminescence

  • ChemPubSoc Europe Logo
  • Author: Angewandte Chemie International Edition
  • Published Date: 16 April 2019
  • Source / Publisher: Angewandte Chemie International Edition/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: First Zeolitic Imidazolate Framework with Circularly Polarized Luminescence

Circularly polarized luminescence (CPL) is a phenomenon in which chiral luminescent materials emit right- or left-handed circularly polarized light. CPL-active materials are useful for optoelectronic applications, e.g., in optical storage and 3D displays. It is, however, still challenging to achieve CPL-active materials which have both a high luminescence efficiency and large luminescence dissymmetry factors (glum), i.e., effective polarization.


Pengfei Duan, National Center for Nanoscience and Technology and University of Chinese Academy of Sciences, Beijing, and colleagues have synthesized a CPL-active chiral zeolitic imidazolate framework (ZIF) using a ligand-exchange approach. The team designed chiral emitters based on a binaphthyldiamine moiety with 4‐(10‐phenylanthrancen‐9‐yl)phenyl and imidazole groups. Either the R- or the S-enantiomer of these ligands was then mixed with Zn‐based ZIF‐8 nanoparticles. A ligand exchange between the chiral emitters and the 2‐methylimidazole on the nanoparticles resulted in chiral, emissive ZIF nanoparticles.


Compared with the same chiral emitters in dilute solution, the chiral ZIF shows an increase of glum by one order of magnitude, as well as an enhancement of luminescence efficiency. The material avoids a major trade-off usually observed with CPL-active materials, where large luminescence dissymmetry factors lead to a suppression of luminescence efficiency. According to the team, the improved properties can be explained by the well‐ordered arrangement of the chiral emitters on the ZIF.


 

Article Views: 769

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

Bookmark and Share

If you would like to reuse any content, in print or online, from ChemistryViews.org, please contact us first for permission. more


CONNECT:

ChemistryViews.org on Facebook

ChemistryViews.org on Twitter ChemistryViews.org on YouTube ChemistryViews.org on LinkedIn Sign up for our free newsletter


A product of ChemPubSoc Europe (16 European Chemical Societies)and Wiley-VCH