Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 113, Issue 27, Pages 9098-9103Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp900665x
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Funding
- National Science Foundation of China [20634020]
- Basic Research Programs of the BIT [BIT-UBF-200504B4213, BIT-UBF-200504B4215]
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Whereas aggregation often quenches luminescence, the emission of a heterocyclic luminogen, 10-[2.5-bis(4-pentyloxyphenycarbonyloxy)phenyl]-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (3), is greatly enhanced by aggregate formation. Crystallization further boosts the emission of 3, turning it from a weak emitter in the solution state to a strong emitter in the crystalline state. The emission of 3 is changed in response to the exposure to vapors of volatile organic compounds (VOCs). The morphology of the thin film of 3 is reversibly and repeatedly modulated between amorphous and crystalline phases by simple fuming-heating and heating-cooling cycles, leading to an emission switching between bright and dark states. The novel attributes of the crystallization-induced emission enhancement, the VOC-responsive emission change, and the morphology-tunable emission switching of 3 could enable it to find applications in an array of technological areas, including chemosensing, optical display and rewritable information storage.
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