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Exciton-polaron interactions in polyfluorene films with β phase
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dc.contributor.author | Montilla, Francisco | |
dc.contributor.author | Ruseckas, Arvydas | |
dc.contributor.author | Samuel, Ifor D. W. | |
dc.date.accessioned | 2019-04-11T23:38:09Z | |
dc.date.available | 2019-04-11T23:38:09Z | |
dc.date.issued | 2018-05-10 | |
dc.identifier | 252808957 | |
dc.identifier | 25a48871-7459-41d7-ad2f-efaa575824ff | |
dc.identifier | 85046965259 | |
dc.identifier | 000432477400005 | |
dc.identifier.citation | Montilla , F , Ruseckas , A & Samuel , I D W 2018 , ' Exciton-polaron interactions in polyfluorene films with β phase ' , Journal of Physical Chemistry C , vol. 122 , no. 18 , pp. 9766-9772 . https://doi.org/10.1021/acs.jpcc.8b01300 | en |
dc.identifier.issn | 1932-7447 | |
dc.identifier.other | ORCID: /0000-0001-9114-3522/work/43646802 | |
dc.identifier.uri | https://hdl.handle.net/10023/17509 | |
dc.description | The authors acknowledge financial support from the European Research Council (grant 321305), Spanish Ministry of Economy Explora Ciencia Project MAT2013-49534-EXP and the Engineering and Physical Sciences Research Council (grants EP/L017008/1 and EP/J009016/1). I.D.W.S. also acknowledges support from a Royal Society Wolfson Research Merit Award. | en |
dc.description.abstract | Fluorescence quenching by electric charges is an important loss mechanism in high-brightness organic light emitting diodes (OLEDs) but its effect is difficult to quantify in working devices. Here we combine an electrochemical technique to control the charge density with time-resolved photoluminescence to distinguish between different quenching mechanisms. The material studied was the blue electroluminescent polymer poly(9,9-dioctylfluorenene) with β phase. Our results show that quenching occurs by Förster resonance energy transfer and is mediated by exciton diffusion. We determine the quenching parameters over a wide range of charge concentrations and estimate their impact on the OLED efficiency roll-off at high current density. We find that fluorescence quenching by charges and singlet-triplet exciton annihilation are the two main mechanisms leading to the efficiency roll-off. Our results suggest that hole polarons are not very effective quenchers of singlet excitons which is important for understanding current devices and encouraging for the development of high-brightness OLEDs and lasers. | |
dc.format.extent | 716957 | |
dc.language.iso | eng | |
dc.relation.ispartof | Journal of Physical Chemistry C | en |
dc.subject | QC Physics | en |
dc.subject | TK Electrical engineering. Electronics Nuclear engineering | en |
dc.subject | DAS | en |
dc.subject.lcc | QC | en |
dc.subject.lcc | TK | en |
dc.title | Exciton-polaron interactions in polyfluorene films with β phase | en |
dc.type | Journal article | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.sponsor | European Research Council | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. Condensed Matter Physics | en |
dc.identifier.doi | https://doi.org/10.1021/acs.jpcc.8b01300 | |
dc.description.status | Peer reviewed | en |
dc.date.embargoedUntil | 2019-04-12 | |
dc.identifier.grantnumber | ep/l017008/1 | en |
dc.identifier.grantnumber | N/A | en |
dc.identifier.grantnumber | en |
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