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나노 구조 물리 연구단
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Shear-Triggered Crystallization and Light Emission of a Thermally Stable Organic Supercooled Liquid

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Title
Shear-Triggered Crystallization and Light Emission of a Thermally Stable Organic Supercooled Liquid
Author(s)
Kyeongwoon Chung; Min Sang Kwon; Brendan M. Leung; Antek G. Wong-Foy; Min Su Kim; Jeongyong Kim; Shuichi Takayama; Johannes Gierschner; Adam J. Matzger; Jinsang Kim
Publication Date
2015-05
Journal
ACS CENTRAL SCIENCE, v.1, no.2, pp.94 - 102
Publisher
AMER CHEMICAL SOC
Abstract
Thermodynamics drive crystalline organic molecules to be crystallized at temperatures below their melting point. Even though molecules can form supercooled liquids by rapid cooling, crystalline organic materials readily undergo a phase transformation to an energetically favorable crystalline phase upon subsequent heat treatment. Opposite to this general observation, here, we report molecular design of thermally stable supercooled liquid of diketopyrrolopyrrole (DPP) derivatives and their intriguing shear-triggered crystallization with dramatic optical property changes. Molten DPP8, one of the DPP derivatives, remains as stable supercooled liquid without crystallization through subsequent thermal cycles. More interestingly, under shear conditions, this supercooled liquid DPP8 transforms to its crystal phase accompanied by a 25-fold increase in photoluminescence (PL) quantum efficiency and a color change. By systematic investigation on supercooled liquid formation of crystalline DPP derivatives and their correlation with chemical structures, we reveal that the origin of this thermally stable supercooled liquid is a subtle force balance between aromatic interactions among the core units and van der Waals interactions among the aliphatic side chains acting in opposite directions. Moreover, by applying shear force to a supercooled liquid DPP8 film at different temperatures, we demonstrated direct writing of fluorescent patterns and propagating fluorescence amplification, respectively. Shear-triggered crystallization of DPP8 is further achieved even by living cell attachment and spreading, demonstrating the high sensitivity of the shear-triggered crystallization which is about 6 orders of magnitude more sensitive than typical mechanochromism observed in organic materials.
URI
http://pr.ibs.re.kr/handle/8788114/2040
DOI
10.1021/acscentsci.5b00091
ISSN
2374-7943
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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