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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.

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.


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).


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University of Toronto



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No conflict of interest.