Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 15, Pages 8477-8482Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202016089
Keywords
near-infrared electroluminescence; organic light-emitting diodes; photophysics; thermally activated delayed fluorescence
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Funding
- Program for Building Regional Innovation Ecosystems of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP17J04907, JP18H02047]
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The study demonstrates a highly efficient NIR emitter with thermally activated delayed fluorescence (TADF) and its application to NIR-OLEDs, achieving unprecedented EQE of 13.4% with a peak wavelength at 734 nm. The TPA-PZTCN emitter can sensitize a deeper NIR fluorophore to achieve an EQE of over 1% in a TADF-sensitized NIR-OLED with high operational durability.
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.).
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