dc.contributor.author	Li, Feng
dc.contributor.author	Gillett, Alex
dc.contributor.author	Gu, Qinying
dc.contributor.author	Ding, Junshuai
dc.contributor.author	Chen, Zhangwu
dc.contributor.author	Hele, Timothy JH
dc.contributor.author	Myers, William K
dc.contributor.author	Friend, Richard
dc.contributor.author	Evans, Emrys W
dc.contributor.orcid	Li, Feng [0000-0001-5236-3709]
dc.contributor.orcid	Gillett, Alex [0000-0001-7572-7333]
dc.contributor.orcid	Hele, Timothy JH [0000-0003-2367-3825]
dc.contributor.orcid	Myers, William K [0000-0001-5935-9112]
dc.contributor.orcid	Friend, Richard [0000-0001-6565-6308]
dc.contributor.orcid	Evans, Emrys W [0000-0002-9092-3938]
dc.date.accessioned	2022-05-18T15:00:58Z
dc.date.available	2022-05-18T15:00:58Z
dc.date.issued	2022-05-18
dc.date.submitted	2021-08-30
dc.date.updated	2022-05-18T15:00:57Z
dc.description	Funder: Leverhulme Trust; doi: https://doi.org/10.13039/501100000275
dc.description.abstract	Organic light-emitting diodes (OLEDs) must be engineered to circumvent the efficiency limit imposed by the 3:1 ratio of triplet to singlet exciton formation following electron-hole capture. Here we show the spin nature of luminescent radicals such as TTM-3PCz allows direct energy harvesting from both singlet and triplet excitons through energy transfer, with subsequent rapid and efficient light emission from the doublet excitons. This is demonstrated with a model Thermally-Activated Delayed Fluorescence (TADF) organic semiconductor, 4CzIPN, where reverse intersystem crossing from triplets is characteristically slow (50% emission by 1 µs). The radical:TADF combination shows much faster emission via the doublet channel (80% emission by 100 ns) than the comparable TADF-only system, and sustains higher electroluminescent efficiency with increasing current density than a radical-only device. By unlocking energy transfer channels between singlet, triplet and doublet excitons, further technology opportunities are enabled for optoelectronics using organic radicals.
dc.identifier.doi	10.17863/CAM.84690
dc.identifier.eissn	2041-1723
dc.identifier.issn	2041-1723
dc.identifier.other	s41467-022-29759-7
dc.identifier.other	29759
dc.identifier.uri	https://www.repository.cam.ac.uk/handle/1810/337275
dc.language	en
dc.publisher	Nature Publishing Group UK
dc.subject	Article
dc.subject	/639/624/1020/1091
dc.subject	/639/301/1019/1020/1091
dc.subject	/120
dc.subject	/140/125
dc.subject	/140/58
dc.subject	/128
dc.subject	article
dc.title	Singlet and triplet to doublet energy transfer: improving organic light-emitting diodes with radicals.
dc.type	Article
dcterms.dateAccepted	2022-03-02
prism.issueIdentifier	1
prism.publicationName	Nat Commun
prism.volume	13
pubs.funder-project-id	Engineering and Physical Sciences Research Council (EP/M005143/1)
pubs.funder-project-id	Engineering and Physical Sciences Research Council (EP/M01083X/1)
pubs.funder-project-id	European Research Council (670405)
pubs.funder-project-id	European Commission Horizon 2020 (H2020) ERC (101020167)
rioxxterms.licenseref.uri	http://creativecommons.org/licenses/by/4.0/
rioxxterms.version	VoR
rioxxterms.versionofrecord	10.1038/s41467-022-29759-7

Singlet and triplet to doublet energy transfer: improving organic light-emitting diodes with radicals.

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