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

Tzu-Chieh Lin, Monima Sarma, Yi-Ting Chen, Shih-Hung Liu, Ke-Ting Lin, Pin-Yi Chiang, Wei-Tsung Chuang, Yi-Chen Liu, Hsiu-Fu Hsu, Wen-Yi Hung (), Wei-Chieh Tang, Ken-Tsung Wong () and Pi-Tai Chou ()
Additional contact information
Tzu-Chieh Lin: National Taiwan University
Monima Sarma: National Taiwan University
Yi-Ting Chen: National Taiwan University
Shih-Hung Liu: National Taiwan University
Ke-Ting Lin: National Taiwan Ocean University
Pin-Yi Chiang: National Taiwan Ocean University
Wei-Tsung Chuang: National Synchrotron Radiation Research Center
Yi-Chen Liu: Tamkang University
Hsiu-Fu Hsu: Tamkang University
Wen-Yi Hung: National Taiwan Ocean University
Wei-Chieh Tang: National Taiwan University
Ken-Tsung Wong: National Taiwan University
Pi-Tai Chou: National Taiwan University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: 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.

Date: 2018
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-018-05527-4 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-05527-4

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-018-05527-4

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().