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Chirality-activated mechanoluminescence from aggregation-induced emission enantiomers with high contrast mechanochromism and force-induced delayed fluorescence
- Source :
- Materials Chemistry Frontiers. 3:1800-1806
- Publication Year :
- 2019
- Publisher :
- Royal Society of Chemistry (RSC), 2019.
-
Abstract
- A pair of chiral aggregation-induced emission (AIE) enantiomers and their racemate exhibit not only distinctively different circularly polarized luminescence behaviors, but also completely opposite mechanoluminescence (ML) activities. The data from single crystal analysis identifies that the bright ML of the AIE enantiomers is probably activated by their molecular chirality, which enables unique chiral crystal structures with a polar space group and compact molecular packing. These experimental findings provide a direction for harvesting prominent ML from AIE luminogens. Concurrently, high contrast mechanochromism with larger ΔλPL,max and ΔΦF,s values by up to 140 nm and 0.61 respectively have been achieved from this AIE system, which represents the state-of-the-art mechanochromic performance for ML emitters. Moreover, force-induced white-light emission and thermally activated delayed fluorescence have also been observed. The results of theoretical calculations suggest that the destruction of intermolecular interactions and conversion of molecular conformation account for the significant multiple-variations in emission properties triggered by a single mechanical stimulus.
- Subjects :
- Chemistry
Intermolecular force
02 engineering and technology
Crystal structure
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
Fluorescence
0104 chemical sciences
Materials Chemistry
General Materials Science
Enantiomer
0210 nano-technology
Luminescence
Chirality (chemistry)
Single crystal
Mechanoluminescence
Subjects
Details
- ISSN :
- 20521537
- Volume :
- 3
- Database :
- OpenAIRE
- Journal :
- Materials Chemistry Frontiers
- Accession number :
- edsair.doi...........3d93ccc4f1c059795e4b723480257fa3