Journal
DYES AND PIGMENTS
Volume 198, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2021.109958
Keywords
Triphenylamine; Twisted configuration; Molecular design strategy; Dual state emission; Organic luminogens; Oscillator strength
Funding
- National Natural Science Foundation of China [51863006, 52163017, 51603050]
- project of Thousand Outstanding Young Teachers' Training in Higher Education Institutions of Guangxi
- Project of Guangxi Natural Science Foundation [2020GXNSFBA297098]
- Open Project Program of Guangxi Key Laboratory of Optical and Electronic Materials and Devices [20AA-2, 20AA-10]
- Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi
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This study presents a rational molecular design strategy for organic luminogens that exhibit efficient emission in both solution and solid-state. The strategy combines theoretical calculations and practical verification to optimize the steric hindrance effect, twisted structure, and chemical modification to enhance the emission properties. Several molecules were successfully synthesized and tested, proving the effectiveness of the strategy. This work contributes to the development of novel luminescent materials with broad applications.
Design and synthesis of organic luminogens with efficient emission in both solution and solid-state (namely, dual-state emission: DSE) still face enormous challenges, a majority of luminescent compounds are always either aggregation-caused quenching or aggregation-induced emission luminogens. The development of dual-state emissive materials is extremely desirable for advanced applications. However, up to now, how to design this kind of materials remains a big challenge. Thus, a further in-depth understanding of the dual-state emission still needs to be established. In this work, a rational molecular design strategy has been presented based on triphenylamine via theoretical calculation and practical verification. First, steric hindrance effect of triphenylamine molecule can render the intramolecular rotation restricted in solution state, which could reduce the nonradiative transition; second, the twisted structure prevents or alleviates detrimental close molecular packing in the solid state; third, rational chemical modification forbids or inhibits the Sn - Tn intersystem crossing, which prevents the formation of triplet excitons and decrease the non-radiative transition rate. Once the above conditions are satisfied, the triphenylamine derivatives can exhibit bright emission in both solution and solid-state. This efficient strategy has been strongly confirmed by TPA-BP, TPA-BT, TPA-BBT and several molecules previously reported. We believe that this work will help to design novel luminescent materials with efficient emission in both solution and solid-state, which is of benefit to organic light-emitting diodes (OLEDs), chemical sensors, smart optoelectronic materials, and other high-tech areas.
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