Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 28, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202203844
Keywords
Aggregation-Induced Emission; Circularly Polarized Luminescence; Organic Electronics; Organic Light-Emitting Devices; Organic Semiconductors; Sensitizers
Categories
Funding
- National Natural Science Foundation of China [62175189, 51873159, 12174146, 51903161]
- Shenzhen Science and Technology Program [KQTD20170330110107046]
- Open Project Program of Wuhan National Laboratory for Optoelectronics [2019WNLOKF015]
- Open Fund of Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University [KLPAOSM202003]
- Program for Promoting Academic Collaboration and Senior Talent Fostering
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Purely organic emitters have great potential in near-infrared organic light-emitting diodes, but suffer from low efficiency. This contribution presents the design and synthesis of two pairs of thermally activated delayed fluorescence enantiomers with unique characteristics. The resulting OLEDs show high efficiency and near-infrared emission.
Purely organic emitters have shown great potential but still suffer from low efficiency in near-infrared organic light-emitting diodes (NIR-OLEDs) due to the intensive non-radiative recombination. In this contribution, two pairs of thermally activated delayed fluorescence (TADF) enantiomers (R/S-DOBP and R/S-HDOBP) with tetracoordinate boron geometries were designed and synthesized. The TADF emitters simultaneously showed aggregation-induced emission, circularly polarized luminescence, high-contrast mechanochromism, and piezochromism behaviors. More importantly, R/S-DOBP and R/S-HDOBP revealed high photoluminescence quantum yields and efficient reverse intersystem crossing in neat films. The nondoped solution-processed OLEDs based on these unique emitters revealed the NIR emission (peaking at 716 nm) with a maximum external quantum efficiency of 1.9 % and high exciton utilization efficiency of 86 %, which represent one of the best solution-processed nondoped NIR-OLEDs.
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