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. 2021 Apr 6;60(15):8477-8482.
doi: 10.1002/anie.202016089. Epub 2021 Mar 3.

Highly Efficient Near-Infrared Electrofluorescence from a Thermally Activated Delayed Fluorescence Molecule

Umamahesh Balijapalli  1 , Ryo Nagata  1 , Nishiki Yamada  1 , Hajime Nakanotani  1   2 , Masaki Tanaka  1 , Anthony D'Aléo  1 , Virginie Placide  1 , Masashi Mamada  1 , Youichi Tsuchiya  1 , Chihaya Adachi  1   2
Affiliations

Highly Efficient Near-Infrared Electrofluorescence from a Thermally Activated Delayed Fluorescence Molecule

Umamahesh Balijapalli et al. Angew Chem Int Ed Engl. .

Abstract

Near-IR organic light-emitting diodes (NIR-OLEDs) are potential light-sources for various sensing applications as OLEDs have unique features such as ultra-flexibility and low-cost fabrication. However, the low external electroluminescence (EL) quantum efficiency (EQE) of NIR-OLEDs is a critical obstacle for potential applications. Here, we demonstrate a highly efficient NIR emitter with thermally activated delayed fluorescence (TADF) and its application to NIR-OLEDs. The NIR-TADF emitter, TPA-PZTCN, has a high photoluminescence quantum yield of over 40 % with a peak wavelength at 729 nm even in a highly doped co-deposited film. The EL peak wavelength of the NIR-OLED is 734 nm with an EQE of 13.4 %, unprecedented among rare-metal-free NIR-OLEDs in this spectral range. TPA-PZTCN can sensitize a deeper NIR fluorophore to achieve a peak wavelength of approximately 900 nm, resulting in an EQE of over 1 % in a TADF-sensitized NIR-OLED with high operational device durability (LT95 >600 h.).

Keywords: near-infrared electroluminescence; organic light-emitting diodes; photophysics; thermally activated delayed fluorescence.

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