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Elucidating Deviating Temperature Behavior of Organic Light-Emitting Diodes and Light-Emitting Electrochemical Cells
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-1256-149x
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0001-9239-0541
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-3481-5163
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2021 (English)In: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, Vol. 9, no 1, article id 2001405Article in journal (Refereed) Published
Abstract [en]

Organic light-emitting diodes (OLEDs) and light-emitting electrochemical cells (LECs) exhibit different operational modes that render them attractive for complementary applications, but their dependency on the device temperature has not been systematically compared. Here, the effects of a carefully controlled device temperature on the performance of OLEDs and LECs based on two common emissive organic semiconductors are investigated. It is found that the peak luminance and current efficacy of the two OLEDs are relatively temperature independent, whereas, the corresponding LECs exhibit a significant increase by approximate to 85% when the temperature is changed from 20 to 80 degrees C. A combination of simulations and measurements reveal that this deviating behavior is consistent with a shift of the emission zone from closer to the transparent anode toward the center of the active material for both the OLEDs and the LECs, which in turn can be induced by a stronger positive temperature dependence of the mobility of the holes than the electrons.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2021. Vol. 9, no 1, article id 2001405
Keywords [en]
doping effects, emission zone position, light-emitting electrochemical cells, optical simulation, organic light-emitting diodes, Super Yellow, temperature dependence
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URN: urn:nbn:se:umu:diva-177163DOI: 10.1002/adom.202001405ISI: 000588678900001Scopus ID: 2-s2.0-85096640158OAI: oai:DiVA.org:umu-177163DiVA, id: diva2:1507768
Available from: 2020-12-08 Created: 2020-12-08 Last updated: 2023-03-24Bibliographically approved

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Ràfols-Ribé, JoanGracia-Espino, EduardoLundberg, PetterSandström, AndreasTang, ShiLarsen, ChristianEdman, Ludvig

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Ràfols-Ribé, JoanGracia-Espino, EduardoLundberg, PetterSandström, AndreasTang, ShiLarsen, ChristianEdman, Ludvig
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