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  • Tri-Spiral Donor for High Efficiency and Versatile Blue Thermally Activated Delayed Fluorescence Materials.

Tri-Spiral Donor for High Efficiency and Versatile Blue Thermally Activated Delayed Fluorescence Materials.

Angewandte Chemie (International ed. in English) (2019-06-14)
Wei Li, Binbin Li, Xinyi Cai, Lin Gan, Zhida Xu, Wenqi Li, Kunkun Liu, Dongcheng Chen, Shi-Jian Su
ABSTRACT

Blue thermally activated delayed fluorescence (TADF) emitters that can simultaneously achieve high efficiency in doped and nondoped organic light-emitting diodes (OLEDs) are rarely reported. Reported here is a strategy using a tri-spiral donor for such versatile blue TADF emitters. Impressively, by simply extending the nonconjugated fragment and molecular length, aggregation-caused emission quenching (ACQ) can be greatly alleviated to achieve as high as a 90 % horizontal orientation dipole ratio and external quantum efficiencies (EQEs) of up to 33.3 % in doped and 20.0 % in nondoped sky-blue TADF-OLEDs. More fascinatingly, a high-efficiency purely organic white OLED with an outstanding EQE of up to 22.8 % was also achieved by employing TspiroS-TRZ as a blue emitter and an assistant host. This compound is the first blue TADF emitter that can simultaneously achieve high electroluminescence (EL) efficiency in doped, nondoped sky-blue, and white TADF-OLEDs.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
1,3,5-Tri[(3-pyridyl)-phen-3-yl]benzene, ≥99% (HPLC)
Sigma-Aldrich
Di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane, ≥97% (HPLC)