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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51349

Title: Probe exciplex structure of highly efficient thermally activated delayed fluorescence organic light emitting diodes
Authors: 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
Pi-Tai Chou
Contributors: 國立臺灣海洋大學:光電與材料科技學士學位學程(學系)
Date: 2018-12
Issue Date: 2018-11-23T06:05:33Z
Publisher: Nature Communications
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.
Relation: 9(1)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51349
Appears in Collections:[光電科學研究所] 期刊論文

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