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Ultrafast Intermolecular Energy Transfer in OLED Materials: Excited-State Dynamics of a Blend of Poly(vinylcarbazole) and Oxadiazole Derivative in Solution and Film States

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dc.contributor.author Thadathilanickal, T D
dc.contributor.author Paul, M
dc.contributor.author Karunakaran, V
dc.date.accessioned 2023-11-06T13:48:48Z
dc.date.available 2023-11-06T13:48:48Z
dc.date.issued 2023-06-08
dc.identifier.citation The Journal of Physical Chemistry C; 127(22):10640-10648 en_US
dc.identifier.uri https://pubs.acs.org/doi/10.1021/acs.jpcc.3c01929
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/4595
dc.description.abstract Intermolecular energy transfer dynamics between layers of organic materials controls the efficiency of organic light-emitting diode (OLED) devices. Here, to understand the ultrafast intermolecular energy transfer dynamics occurring in widely used UV-OLED materials of poly(vinylcarbazole) (PVK, donor: hole-transporting material) and synthesized oxadiazole derivative (OXD, acceptor: electron-transporting material), their excited-state relaxation pathways are investigated in tetrahydrofuran (THF) and film. Upon addition of OXD, the nanosecond fluorescence lifetime studies of PVK exhibited efficient quenching of dynamics, supporting the occurrence of Förster resonance energy transfer from PVK to OXD with an efficiency of ∼90%. The femtosecond time-resolved absorption measurements of the mixture of PVK and OXD revealed the intermolecular resonance energy transfer with a time constant of ∼1.32 ps from all of the intermediates in the excited states of PVK to OXD. Interestingly, in the film state, the formation of exciplex beneficial for devices with a lifetime of ∼32.66 ns was observed at ∼516 nm upon excitation of PVK in a blend of OXD and PVK. Nanosecond transient absorption spectra confirmed the occurrence of energy transfer also from the triplet state of PVK. Understanding of these excited-state dynamics occurring in solution and film states is a prerequisite to design and improve the performance of OLED materials. en_US
dc.language.iso en en_US
dc.publisher American Chemical Society en_US
dc.subject absorption en_US
dc.subject energy transfer en_US
dc.subject fluorescence en_US
dc.subject fluorescence resonance energy transfer en_US
dc.subject mixtures en_US
dc.title Ultrafast Intermolecular Energy Transfer in OLED Materials: Excited-State Dynamics of a Blend of Poly(vinylcarbazole) and Oxadiazole Derivative in Solution and Film States en_US
dc.type Article en_US


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  • 2023
    Research articles authored by NIIST researchers published in 2023

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