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Carrier recombination dynamics in external-quantum-efficiency roll-off of perovskite light-emitting diodes studied by in situ ultrafast spectroscopy
Southeast Univ, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-9956-2358
Southeast Univ, Peoples R China.
Southeast Univ, Peoples R China.
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2024 (English)In: Physical Review Applied, E-ISSN 2331-7019, Vol. 22, no 5, article id 054072Article in journal (Refereed) Published
Abstract [en]

External-quantum-efficiency (EQE) roll-off is a key challenge for perovskite light-emitting diodes (PeLEDs), limiting their applications where high brightness is needed. Auger recombination and Joule heating are considered the main issues behind the EQE roll-off in PeLEDs. Despite intensive efforts to address these issues, roll-off in PeLEDs remains significant, indicating important roles played by other factors. We now investigate the carrier dynamics during the EQE roll-off of PeLEDs by employing in situ time-resolved photoluminescence. We identify that accelerated trap-assisted recombination at high current densities is a key reason behind roll-off. Inspired by this new understanding, we introduce a molecule that successfully restrains the activation of trap states and hence significantly suppresses EQE roll-off. As such, our results pave the way toward the development of high-brightness PeLEDs.
Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2024. Vol. 22, no 5, article id 054072
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Identifiers
URN: urn:nbn:se:liu:diva-212045DOI: 10.1103/PhysRevApplied.22.054072ISI: 001426435100004Scopus ID: 2-s2.0-85210748449OAI: oai:DiVA.org:liu-212045DiVA, id: diva2:1942496
Note

Funding Agencies|National Nature Science Foundation of China [62225404, 61927808]; National Key Research and Development Program of China; Natural Science Foundation of Jiangsu Province; Major Project [BK20222007]; Research Fund for Advanced Ocean Institute of Southeast University (Key Program) [KP202411]; Fundamental Research Funds for the Central Universities [242023k30027, 2242022R40046]; ERC Consolidator Grant (LEAP); Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009-00971]; Wallenberg Academy Fellow; Young Scientist Fund; Start-up Research Fund of Southeast University; [62174026]; [2021YFA1200700]; [101045098]; [BK20210200]; [RF1028623151]

Available from: 2025-03-05 Created: 2025-03-05 Last updated: 2025-03-05

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