Umeå University's logo

umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Efficiency roll-off in light-emitting electrochemical cells
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-1256-149x
Department of Chemistry − Ångström Laboratory, Uppsala University, Uppsala, Sweden.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-1274-5918
Show others and affiliations
2024 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095Article in journal (Refereed) Epub ahead of print
Abstract [en]

Understanding “efficiency roll-off” (i.e., the drop in emission efficiency with increasing current) is critical if efficient and bright emissive technologies are to be rationally designed. Emerging light-emitting electrochemical cells (LECs) can be cost- and energy-efficiently fabricated by ambient-air printing by virtue of the in situ formation of a p-n junction doping structure. However, this in situ doping transformation renders a meaningful efficiency analysis challenging. Herein, a method for separation and quantification of major LEC loss factors, notably the outcoupling efficiency and exciton quenching, is presented. Specifically, the position of the emissive p-n junction in common singlet-exciton emitting LECs is measured to shift markedly with increasing current, and the influence of this shift on the outcoupling efficiency is quantified. It is further verified that the LEC-characteristic high electrochemical-doping concentration renders singlet-polaron quenching (SPQ) significant already at low drive current density, but also that SPQ increases super-linearly with increasing current, because of increasing polaron density in the p-n junction region. This results in that SPQ dominates singlet-singlet quenching for relevant current densities, and significantly contributes to the efficiency roll-off. This method for deciphering the LEC efficiency roll-off can contribute to a rational realization of all-printed LEC devices that are efficient at highluminance.

Place, publisher, year, edition, pages
John Wiley & Sons, 2024.
Keywords [en]
efficiency roll-off, light-emitting electrochemical cell, p-n junction position, singlet-polaron quenching, singlet-singlet quenching
National Category
Atom and Molecular Physics and Optics Materials Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-220016DOI: 10.1002/adma.202310156ISI: 001143796900001PubMedID: 38211953Scopus ID: 2-s2.0-85182424168OAI: oai:DiVA.org:umu-220016DiVA, id: diva2:1832572
Funder
Swedish Research Council, 2019-02345Swedish Research Council, 2021-04778Swedish Energy Agency, 50779-1Swedish Energy Agency, P2021-00032Bertil & Britt Svenssons Stiftelse för BelysningsteknikThe Kempe FoundationsKnut and Alice Wallenberg Foundation, KAW 2022.0381Knut and Alice Wallenberg Foundation, WISE-AP01-D02EU, European Research Council, 101096650Available from: 2024-01-30 Created: 2024-01-30 Last updated: 2024-01-30

Open Access in DiVA

fulltext(1864 kB)31 downloads
File information
File name FULLTEXT01.pdfFile size 1864 kBChecksum SHA-512
e10153892e0fbe2006f2595a040f95b0388935fc895fc73cac34e6eaead5f16207b209f5c9e6c2a61d912359f3677c2a5613410b2f010fad2fa9b5774b9b6c24
Type fulltextMimetype application/pdf

Other links

Publisher's full textPubMedScopus

Authority records

Zhang, XiaoyingRàfols-Ribé, JoanTang, ShiGracia-Espino, EduardoLarsen, ChristianEdman, Ludvig

Search in DiVA

By author/editor
Zhang, XiaoyingRàfols-Ribé, JoanTang, ShiGracia-Espino, EduardoLarsen, ChristianEdman, Ludvig
By organisation
Department of Physics
In the same journal
Advanced Materials
Atom and Molecular Physics and OpticsMaterials Chemistry

Search outside of DiVA

GoogleGoogle Scholar
Total: 31 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
pubmed
urn-nbn

Altmetric score

doi
pubmed
urn-nbn
Total: 210 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf