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Saul Jones et al BsubNc ChemRxiv 12-10-2020.pdf (2.08 MB)

Exploring the Effects of Bay Position Chlorination on the Emissive Properties of Chloro-(Chloro)n-Boron Subnaphthalocyanines for Light Emission.

preprint
submitted on 11.12.2020, 15:34 and posted on 14.12.2020, 11:28 by Saul T.E. Jones, Andrew J. Pearson, Jeremy D. Dang, Neil Greenham, Timothy Bender, Dan Credgington

Abstract: It has been previously found that through an established synthesis of the macrocycle boron subnaphthalocyanine (BsubNc) that random bay-position chlorination occurs and results in a mixed alloyed composition that cannot be separated; called chloro-(chloron)-boron subnaphthalocyanines (Cl-ClnBsubNcs). Through modifications of the synthetic method, amounts of the average bay-position chlorination can be varied. Cl-ClnBsubNcs are fluorescent and therefore here we explore the effect of the amount of bay-position chlorination on the photoluminescent and electroluminescent properties of Cl-ClnBsubNcs. Distinct from previous reports detailing the positive impact of higher average bay-position chlorination, we find that the photophysical processes important to OLEDs improve with lower average bay-position chlorination. A higher degree of bay-position chlorine shows higher nonradiative recombination rates, lower photoluminescence quantum efficiencies and a basic OLEDs exhibits a greater host emission fraction, implying less effective energy transfer. These results advance the consideration of subnaphthalocyanines for light-emitting and optoelectronic applications.

Funding

The authors acknowledge support from the EPSRC through the grant EP/M024873/1. This work was also supported by a Natural Sciences and Engineering Research Council (NSERC) Discovery Grant to TPB. D.C and S.T.E.J acknowledge the Royal Society for funding (grant numbers UF130278 and RG140472).

History

Email Address of Submitting Author

tim.bender@utoronto.ca

Institution

University of Toronto

Country

Canada

ORCID For Submitting Author

0000-0002-6086-7445

Declaration of Conflict of Interest

No conflict of interest.

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