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Thermally activated and aggregation-regulated excitonic coupling enable emissive high-lying triplet excitons
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dc.contributor.author | Wang, Tao | |
dc.contributor.author | De, Joydip | |
dc.contributor.author | Wu, Sen | |
dc.contributor.author | Gupta, Abhishek Kumar | |
dc.contributor.author | Zysman-Colman, Eli | |
dc.date.accessioned | 2022-07-05T09:30:19Z | |
dc.date.available | 2022-07-05T09:30:19Z | |
dc.date.issued | 2022-08-08 | |
dc.identifier | 280019072 | |
dc.identifier | 5ff6b68d-2e8c-43b8-893e-3a80fd586143 | |
dc.identifier | 85133314749 | |
dc.identifier | 000820404500001 | |
dc.identifier.citation | Wang , T , De , J , Wu , S , Gupta , A K & Zysman-Colman , E 2022 , ' Thermally activated and aggregation-regulated excitonic coupling enable emissive high-lying triplet excitons ' , Angewandte Chemie International Edition , vol. 61 , no. 33 , e202206681 . https://doi.org/10.1002/anie.202206681 | en |
dc.identifier.issn | 1433-7851 | |
dc.identifier.other | ORCID: /0000-0003-4200-3712/work/115631206 | |
dc.identifier.other | ORCID: /0000-0001-7183-6022/work/115631229 | |
dc.identifier.other | ORCID: /0000-0002-3195-2608/work/116598090 | |
dc.identifier.uri | https://hdl.handle.net/10023/25602 | |
dc.description | Funding: Horizon 2020 Framework Programme (Grant Number(s): 897098; Grant recipient(s): Tao Wang, Eli Zysman-Colman); Horizon 2020 Framework Programme (Grant Number(s): 101025143; Grant recipient(s): Eli Zysman-Colman, Joydip De); Engineering and Physical Sciences Research Council (Grant Number(s): EP/P010482/1; Grant recipient(s): Eli Zysman-Colman); Royal Society (Grant Number(s): SRF\R1\201089; Grant recipient(s): Abhishek Kumar Gupta, Eli Zysman-Colman); China Scholarship Council (GrantNumber(s): 201906250199; Grant recipient(s): Sen Wu) | en |
dc.description.abstract | Room-temperature phosphorescence (RTP) originating from higher-lying triplet excitons remains a rather rarely documented occurrence for purely organic molecular systems. Here, we report two naphthalene-based RTP luminophores whose phosphorescence emission is enabled by radiative decay of high-lying triplet excitons. In contrast, upon cooling the dominant phosphorescence originates from the lowest-lying triplet excited state, which is manifested by a red-shifted emission. Photophysical and theoretical studies reveal that the unusual RTP results from thermally activated excitonic coupling between different conformations of the compounds. Aggregation-regulated excitonic coupling is observed when increasing the doping concentration of the emitters in poly(methylmethacrylate) (PMMA). Further, the RTP quantum efficiency improves more than 80-fold in 1,3-bis(N-carbazolyl)benzene (mCP) compared to that in PMMA. This design principle offers important insight into triplet excited state dynamics and has been exploited in afterglow-indicating temperature sensing. | |
dc.format.extent | 11 | |
dc.format.extent | 11113432 | |
dc.language.iso | eng | |
dc.relation.ispartof | Angewandte Chemie International Edition | en |
dc.subject | Excitonic coupling | en |
dc.subject | Higher-lying triplet excitons | en |
dc.subject | Host-guest system | en |
dc.subject | Room-temperature phosphorescence | en |
dc.subject | QD Chemistry | en |
dc.subject | DAS | en |
dc.subject.lcc | QD | en |
dc.title | Thermally activated and aggregation-regulated excitonic coupling enable emissive high-lying triplet excitons | en |
dc.type | Journal article | en |
dc.contributor.sponsor | European Commission | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.sponsor | The Royal Society | en |
dc.contributor.institution | University of St Andrews. School of Chemistry | en |
dc.contributor.institution | University of St Andrews. Centre for Energy Ethics | en |
dc.contributor.institution | University of St Andrews. EaSTCHEM | en |
dc.contributor.institution | University of St Andrews. Institute of Behavioural and Neural Sciences | en |
dc.identifier.doi | https://doi.org/10.1002/anie.202206681 | |
dc.description.status | Peer reviewed | en |
dc.identifier.grantnumber | 101025143 | en |
dc.identifier.grantnumber | EP/P010482/1 | en |
dc.identifier.grantnumber | SRF\R1\201089 | en |
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