Synergistic steric hindrance and multiple resonance effect for efficient TADF with narrowband emission and accelerated upconversion
aNingbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
bCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
cState Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou 510640, China
dFrontier Science Center for Smart Materials, College of Chemistry, Dalian University of Technology, Dalian 116024, China
eInstitute for Smart Materials & Engineering, University of Jinan, Ji’nan 250022, China
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