Journal
CHEMICAL SCIENCE
Volume 12, Issue 2, Pages 767-773Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0sc04646a
Keywords
-
Categories
Funding
- EU [722591]
- School of Chemistry at Cardiff University
- EPSRC [EP/R029385/1]
- Leverhulme Trust [RPG-2019-122]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0020168]
- U.S. Department of Energy (DOE) [DE-SC0020168] Funding Source: U.S. Department of Energy (DOE)
- EPSRC [EP/R029385/1] Funding Source: UKRI
Ask authors/readers for more resources
Development of new organic phosphorescent materials with high quantum yields was achieved by introducing various bromo substituents to modulate intermolecular halogen-bonding interactions. Strategic heavy-atom positioning was found to suppress non-radiative relaxation and enhance intersystem crossing, facilitated by the orbital angular momentum change. Results suggest the potential of multivalent noncovalent interactions for excited-state conformation and electronic control.
Development of purely organic materials displaying room-temperature phosphorescence (RTP) will expand the toolbox of inorganic phosphors for imaging, sensing or display applications. While molecular solids were found to suppress non-radiative energy dissipation and make the RTP process kinetically favourable, such an effect should be enhanced by the presence of multivalent directional non-covalent interactions. Here we report phosphorescence of a series of fast triplet-forming tetraethyl naphthalene-1,4,5,8-tetracarboxylates. Various numbers of bromo substituents were introduced to modulate intermolecular halogen-bonding interactions. Bright RTP with quantum yields up to 20% was observed when the molecule is surrounded by a Br/O halogen-bonded network. Spectroscopic and computational analyses revealed that judicious heavy-atom positioning suppresses non-radiative relaxation and enhances intersystem crossing at the same time. The latter effect was found to be facilitated by the orbital angular momentum change, in addition to the conventional heavy-atom effect. Our results suggest the potential of multivalent noncovalent interactions for excited-state conformation and electronic control.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available