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Organic Optoelectronics is the future semiconductor platform due to its unmatched chemical versatility, lightweight low density solid phases and easy solution and vacuum processability added to which is their inherently higher biocompatibility. Conventional singlet emitters suffer the spin statistics roadblock, wherein 3/4thof all generated bright singlet excitons efficiently convert into dark triplet excitons. In my talk I will show how our(Prof. Richard H. Friend’s) group in Cambridge has been able to mitigate this problem by developing an efficient doublet manifold of emissive organic compounds reported in Nature in 2018[1]. In my talk I will demonstrate a part of my research[2]where we managed to hugely stabilize and these compounds through a simple weak-donor substitution, this allows us to massively expand the chemical space of accessible high-spin emitters, fabricate near 28% EQE (96% PLQE) emitters at 700nm and give us unprecedented access to explore these compounds for optoelectronic applications at the optical-spin interface[3]. On the other end of dark-exciton management strategies I will also gloss over some strategies to mitigate losses in organometallic cage compounds as well. The talk should be accessible to undergraduates and experts alike with only some preliminary understanding of organic and physical chemistry.
[1] Ai, X., Evans, E.W., Dong, S.et al.Efficient radical-based light-emitting diodes with doublet emission.Nature563, 536–540 (2018).
[2] Murto, P.,Chowdhury, R., Gorgon, S., Zeng, W., Guo, E., Bronstein, H.A*., Friend, R.H.*Trityl radicals as a new platform for doublet emission: symmetry breaking, charge-transfer states and conjugated polymers.Submitted (2022).
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