Cyanostilbene‐Based AIEgen Smart Film: Optical Switching by Engineering Molecular Packing Structure and Molecular Conformation Through Thermal and Photoinduced Monotropic Phase Transition

The optical properties of newly synthesized cyanostilbene‐based AIEgen (D4CS) exhibiting a unique monotropic phase transition are modulated by engineering molecular packing structure and molecular conformation through temperature change and light irradiation. D4CS exhibits only a low‐ordered smectic...

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Bibliographic Details
Published in:Advanced optical materials 2022-06, Vol.10 (11), p.n/a
Main Authors: Koo, Jahyeon, Jang, Junhwa, Oh, Mintaek, Kim, Minwook, Hyeong, Jaeseok, Lim, Seok‐In, Cao, Yan, Tran, Duy Thanh, Park, Sungjune, Jeong, Kwang‐Un
Format: Article
Language:English
Subjects:
aggregation‐induced emission
Crystallization
cyclosiloxane
Display devices
Heat treatment
Isomerization
Light irradiation
Materials science
Molecular conformation
molecular packing structure
Molecular structure
monotropic phase transition
Optical materials
Optical measuring instruments
Optical properties
Optical switching
Optics
Phase transitions
photoisomerization
Room temperature
Smectic liquid crystals
Temperature dependence
Thin films
Time dependence
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Summary:The optical properties of newly synthesized cyanostilbene‐based AIEgen (D4CS) exhibiting a unique monotropic phase transition are modulated by engineering molecular packing structure and molecular conformation through temperature change and light irradiation. D4CS exhibits only a low‐ordered smectic liquid crystal (SmA) phase over a wide temperature range during cooling and subsequent heating processes, while D4CS crystallizes after a significantly long annealing time at room temperature. Crystallized D4CS exhibits a complex phase transition (SmCr–SmB–SmA–Iso) in the subsequent heating process. In addition, the photoisomerization behavior of D4CS from trans to cis conformer can induce a phase transition to the isotropic (Iso) state, and the reverse isomerization can occur by high‐temperature heat treatment. This unique thermal and photoinduced phase transition of D4CS is accompanied by changes in optical properties including transmittance and luminescence. Based on the optical switching behavior of D4CS, photopatternable temperature and time‐dependent optical films are demonstrated. The newly developed cyanostilbene‐based AIEgen is a smart optical material with great potential for advanced optical sensors, anti‐counterfeiting ink and smart display system. The optical properties of newly synthesized cyanostilbene‐based AIEgen exhibiting a unique monotropic phase transition are modulated by engineering molecular packing structure and molecular conformation through temperature change and light irradiation. The thermal and photoinduced synergetic optical switching of the cyanostilbene‐based AIEgen can be utilized in advanced optical sensors, anti‐counterfeiting ink, and smart display system.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202200405