Issue 10, 2019

An AIE molecule featuring changeable triplet emission between phosphorescence and delayed fluorescence by an external force

Abstract

In this article, we report a newly designed molecule ODFRPTZ with an asymmetric D–A–D′ type structure. ODFRPTZ is endowed with aggregation-induced emission (AIE), intriguing mechanochromism and changeable emission between delayed fluorescence and phosphorescence. In the THF/H2O system, the emission efficiency of ODFRPTZ is greatly improved by increasing the water fraction due to the restriction of the intramolecular rotation and vibration in the aggregation states. Intriguingly, ODFRPTZ shows mechanochromic properties under both UV light and visible light. The emission color switches from green to yellow and the color under visible light changes from white to yellow after grinding due to the changeable conformations of phenothiazine from quasi-axial to quasi-equatorial. The crystalline powder shows prompt fluorescence and phosphorescence characteristics. The lifetime of phosphorescence continuously increases from 0.4 ms at 300 K to 121.1 ms at 77 K. The emission of ground powder is composed of prompt fluorescence and delayed fluorescence with lifetimes of 18.7 ns and 0.9 μs, respectively. To the best of our knowledge, it is a rarely reported AIE example that the triplet state emission can be altered from phosphorescence to delayed fluorescence by an external force.

Graphical abstract: An AIE molecule featuring changeable triplet emission between phosphorescence and delayed fluorescence by an external force

Supplementary files

Article information

Article type
Research Article
Submitted
09 আগষ্ট 2019
Accepted
21 আগষ্ট 2019
First published
22 আগষ্ট 2019

Mater. Chem. Front., 2019,3, 2151-2156

An AIE molecule featuring changeable triplet emission between phosphorescence and delayed fluorescence by an external force

L. Huang, X. Wen, J. Liu, M. Chen, Z. Ma and X. Jia, Mater. Chem. Front., 2019, 3, 2151 DOI: 10.1039/C9QM00509A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements