Affiliation:
1. School of Materials Science and Engineering Jiangsu Engineering Research Center of Light-Electricity-Heat Energy-Converting Materials and Applications Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Jiangsu Key Laboratories of Environment-Friendly Polymers National Experimental Demonstration Center for Materials Science and Engineering Changzhou University Changzhou 213164 P. R. China
2. State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
3. State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 P. R. China
Abstract
AbstractNear‐infrared (NIR) organic light‐emitting diodes (OLEDs) suffer from the low external electroluminescence (EL) quantum efficiency (EQE), which is a critical obstacle for potential applications. Herein, 1‐oxo‐1‐phenalene‐2,3‐dicarbonitrile (OPDC) is employed as an electron‐withdrawing aromatic ring, and by incorporating with triphenylamine (TPA) and biphenylphenylamine (BBPA) donors, two novel NIR emitters with thermally activated delayed fluorescence (TADF) characteristics, namely OPDC‐DTPA and OPDC‐DBBPA, are first developed and compared in parallel. Intense NIR emission peaks at 962 and 1003 nm are observed in their pure films, respectively. Contributed by the local excited (LE) characteristics in the triplet (T1) state in synergy with the charge transfer (CT) characteristics for the singlet (S1) state to activate TADF emission, the solution processable doped NIR OLEDs based on OPDC‐DTPA and OPDC‐DBBPA yield EL peaks at 834 and 906 nm, accompanied with maximum EQEs of 0.457 and 0.103 %, respectively, representing the state‐of‐the‐art EL performances in the TADF emitter‐based NIR‐OLEDs in the similar EL emission regions so far. This work manifests a simple and effective strategy for the development of NIR TADF emitters with long wavelength and efficiency synchronously.
Funder
National Natural Science Foundation of China
Subject
General Chemistry,Catalysis,Organic Chemistry
Cited by
1 articles.
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