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240114s2024 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202310156
|2 doi
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|a pubmed25n1222.xml
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|a (DE-627)NLM367025019
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|a (NLM)38211953
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|a DE-627
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|a eng
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|a Zhang, Xiaoying
|e verfasserin
|4 aut
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|a Efficiency Roll-Off in Light-Emitting Electrochemical Cells
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|c 2024
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 11.04.2024
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2024 The Authors. Advanced Materials published by Wiley‐VCH GmbH.
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|a 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
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|a Journal Article
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|a efficiency roll‐off
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|a light‐emitting electrochemical cell
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|a p‐n junction position
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| 650 |
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4 |
|a singlet‐polaron quenching
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| 650 |
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4 |
|a singlet‐singlet quenching
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1 |
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|a Ràfols-Ribé, Joan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Mindemark, Jonas
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Tang, Shi
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Lindh, Mattias
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Gracia-Espino, Eduardo
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Larsen, Christian
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Edman, Ludvig
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 36(2024), 15 vom: 01. Apr., Seite e2310156
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnas
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| 773 |
1 |
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|g volume:36
|g year:2024
|g number:15
|g day:01
|g month:04
|g pages:e2310156
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|u http://dx.doi.org/10.1002/adma.202310156
|3 Volltext
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