Tuning molecular emission of organic emitters from fluorescence to phosphorescence through push-pull electronic effects

Hai-Tao Feng, Jiajie Zeng, Ping-An Yin, Xue-Dong Wang, Qian Peng (), Zujin Zhao (), Jacky W. Y. Lam and Ben Zhong Tang ()
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Hai-Tao Feng: Baoji University of Arts and Sciences
Jiajie Zeng: South China University of Technology
Ping-An Yin: South China University of Technology
Xue-Dong Wang: Soochow University
Qian Peng: Institute of Chemistry, Chinese Academy of Sciences
Zujin Zhao: South China University of Technology
Jacky W. Y. Lam: The Hong Kong University of Science and Technology
Ben Zhong Tang: The Hong Kong University of Science and Technology

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Organic emitters with persistent phosphorescence have shown potential application in optoelectronic devices. However, rational design and phosphorescence tuning are still challenging. Here, a series of metal-free luminophores without heavy atoms and carbonyl groups from commercial/lab-synthesized carbazole and benzene were synthesized to realize tunable molecular emission from fluorescence to phosphorescence by simply substituent variation. All the molecules emit blue fluorescence in both solution and solid state. Upon removal of excitation source, the fluorinated luminophores show obvious phosphorescence. The lab-synthesized carbazole based molecules exhibit a huge lifetime difference to the commercially purchased ones due to the existence of isomer in the latter samples. The small energy gap between singlet and triplet state and low reorganization energy help enhance intersystem crossing to contribute to a more competitive radiative process from triplet to ground state. Blue and white organic light-emitting devices are fabricated by using fluorinated luminophore as emitting layer.

Date: 2020
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DOI: 10.1038/s41467-020-16412-4

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