Versatile Molecular Functionalization for Inhibiting Concentration Quenching of Thermally Activated Delayed Fluorescence

Jiyoung Lee; Naoya Aizawa; Masaki Numata; Chihaya Adachi; Takuma Yasuda

doi:10.1002/adma.201604856

Versatile Molecular Functionalization for Inhibiting Concentration Quenching of Thermally Activated Delayed Fluorescence

Adv Mater. 2017 Jan;29(4). doi: 10.1002/adma.201604856. Epub 2016 Nov 15.

Authors

Jiyoung Lee^{1

2}, Naoya Aizawa¹, Masaki Numata³, Chihaya Adachi^{3

4}, Takuma Yasuda^{1

2

4}

Affiliations

¹ INAMORI Frontier Research Center (IFRC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
² Department of Automotive Science, Graduate School of Integrated Frontier Sciences, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
³ Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
⁴ Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.

PMID: 27859841
DOI: 10.1002/adma.201604856

Abstract

Concentration quenching of thermally activated delayed fluorescence is found to be dominated by electron-exchange interactions, as described by the Dexter energy-transfer model. Owing to the short-range nature of the electron-exchange interactions, even a small modulation in the molecular geometric structure drastically affects the concentration-quenching, leading to enhanced solid-state photoluminescence and electroluminescence quantum efficiencies.

Keywords: concentration quenching; donor-acceptor; energy transfer; organic light-emitting diodes; thermally activated delayed fluorescence.