Probe exciplex structure of highly efficient thermally activated delayed fluorescence organic light emitting diodes

doi:10.1038/s41467-018-05527-4

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Title:	Probe exciplex structure of highly efficient thermally activated delayed fluorescence organic light emitting diodes
Authors:	Lin, Tzu-Chieh;Sarma, Monima;Chen, Yi-Ting;Liu, Shih-Hung;Lin, Ke-Ting;Chiang, Pin-Yi;Chuang, Wei-Tsung;Liu, Yi-Chen;Hsu, Hsiu-Fu;Hung, Wen-Yi;Tang, Wei-Chieh;Wong, Ken-Tsung;Chou, Pi-Tai
Date:	2018-08-06
Issue Date:	2018-11-08 12:11:58 (UTC+8)
Publisher:	Springer Nature Limited
Abstract:	The lack of structural information impeded the access of efficient luminescence for the exciplex type thermally activated delayed fluorescence (TADF). We report here the pump-probe Step-Scan Fourier transform infrared spectra of exciplex composed of a carbazole-based electron donor (CN-Cz2) and 1,3,5-triazine-based electron acceptor (PO-T2T) codeposited as the solid film that gives intermolecular charge transfer (CT), TADF, and record-high exciplex type cyan organic light emitting diodes (external quantum efficiency: 16%). The transient infrared spectral assignment to the CT state is unambiguous due to its distinction from the local excited state of either the donor or the acceptor chromophore. Importantly, a broad absorption band centered at ~2060 cm−1 was observed and assigned to a polaron-pair absorption. Time-resolved kinetics lead us to conclude that CT excited states relax to a ground-state intermediate with a time constant of ~3 µs, followed by a structural relaxation to the original CN-Cz2:PO-T2T configuration within ~14 µs.
Relation:	Nature Communications 9, p.3111
DOI:	10.1038/s41467-018-05527-4
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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