期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202000105
关键词
anti-counterfeiting; excitonic materials; fluorescent materials; haptic sensors; J-aggregates; piezoresponsive materials
类别
资金
- Ministry of Science and Technology of People's Republic of China [2017YFA0204503, 2018YFA0704805]
- National Natural Science Foundation of China [21503139, 21573251, 21673144, 21873065, 21833005, 21790364]
- Beijing Natural Science Foundation of China [2192011]
- Highlevel Teachers in Beijing Municipal Universities in the Period of 13th Five-year Plan [IDHT20180517, CITTCD20180331]
- Open Fund of the State Key Laboratory of Integrated Optoelectronics [IOSKL2019KF01]
- Capacity Building for Sci-Tech Innovation-Fundamental Scientific Research Funds [025185305000/210, 009/19530050162, 19530012018]
- Youth Innovative Research Team of Capital Normal University [009/19530050148]
- Beijing Advanced Innovation Center for Imaging Theory and Technology [009/19530011009]
Piezochromic fluorescent (PCF) materials with distinct multicolor switching have attracted wide attention in many fields such as optoelectronic devices and deformation detection. However, few PCF materials with low-pressure stimuli and good recoverability have been reported. A highly sensitive and easily recoverable PCF molecular system that can switch between green (G) and orange (O) emissions upon an extremely low piezoresponsive (PR) of 0.5 MPa and heating at 120 degrees C is demonstrated. A mechanistic study combining X-ray diffraction analysis and the theoretical calculations reveal that a slight change in slipping-angle of pi-stacks induced by mechanical pressure amplifies the exciton couplings from G to O J-aggregates, leading to not only distinct PCF switching but also high emission efficiencies >0.5 owing to superradiance of J-aggregate excitons. Benefiting from low MPa PR, high emission efficiency, and good recoverability applications including haptic sensors and anti-counterfeiting application are demonstrated. This research introduces the effect of stimuli-responsive excitonic coupling as new design guidance for developing PCF materials with low-pressure stimuli, high emission efficiency, and good recoverability.
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