Broadband luminescence and emission enhancement
Identifieur interne : 000024 ( Main/Exploration ); précédent : 000023; suivant : 000025Broadband luminescence and emission enhancement
Auteurs : Yi‐Feng Sun [République populaire de Chine] ; Shu‐Hong Xu [République populaire de Chine] ; Zhi‐Yong Chen [République populaire de Chine] ; Wen‐Long Pan [République populaire de Chine] ; Hua‐Can Song [République populaire de Chine] ; Jiang‐Han Chen [République populaire de Chine]Source :
- Coloration Technology [ 1472-3581 ] ; 2011-10.
Abstract
Three novel quinoline– and fluorene–coumarin hybrids were prepared and characterised by Fourier Transform–infrared spectroscopy, proton and carbon nuclear magnetic resonance spectroscopy, mass spectrometry, elemental analysis and ultraviolet–visible spectrophotometry. Their photoluminescence properties were investigated. All of these hybrid molecules exhibited a broadband emission from ca. 450 to 800 nm when excited by a 325 nm helium–cadmium laser at room temperature. Importantly, the fluorene–coumarin hybrid shows a very bright red emission at ca. 650 nm and displays up to a 10‐fold increase in fluorescence emission intensity, as compared with the other samples. The experimental results confirm that remarkable enhancements in the fluorescence emission intensity can be obtained by introducing a fluorene group into the azo‐bridged coumarin‐based π‐conjugated framework. The geometry structures and frontier orbitals are calculated by the ab initio Hartree–Fock method.
Url:
DOI: 10.1111/j.1478-4408.2011.00317.x
Affiliations:
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Chine</country><wicri:regionArea>School of Chemistry and Chemical Engineering, Sun Yat‐Sen University, Guangzhou 510275</wicri:regionArea><placeName><settlement type="city">Jiangmen</settlement><region type="province">Guangdong</region></placeName></affiliation></author><author><name sortKey="Chen, Jiang An" sort="Chen, Jiang An" uniqKey="Chen J" first="Jiang‐Han" last="Chen">Jiang‐Han Chen</name><affiliation wicri:level="1"><country wicri:rule="url">République populaire de Chine</country><wicri:regionArea>China National Analysis Center, Guangzhou 510070</wicri:regionArea><placeName><settlement type="city">Jiangmen</settlement><region type="province">Guangdong</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Coloration Technology</title><idno type="ISSN">1472-3581</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2011-10">2011-10</date><biblScope unit="vol">127</biblScope><biblScope unit="issue">5</biblScope><biblScope unit="page" from="328">328</biblScope><biblScope unit="page" to="334">334</biblScope></imprint><idno type="ISSN">1472-3581</idno></series><idno type="istex">CBB0BB7A8CAF953637535B14F5F660389EDC9CA4</idno><idno type="DOI">10.1111/j.1478-4408.2011.00317.x</idno><idno type="ArticleID">COTE317</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1472-3581</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Three novel quinoline– and fluorene–coumarin hybrids were prepared and characterised by Fourier Transform–infrared spectroscopy, proton and carbon nuclear magnetic resonance spectroscopy, mass spectrometry, elemental analysis and ultraviolet–visible spectrophotometry. Their photoluminescence properties were investigated. All of these hybrid molecules exhibited a broadband emission from ca. 450 to 800 nm when excited by a 325 nm helium–cadmium laser at room temperature. Importantly, the fluorene–coumarin hybrid shows a very bright red emission at ca. 650 nm and displays up to a 10‐fold increase in fluorescence emission intensity, as compared with the other samples. The experimental results confirm that remarkable enhancements in the fluorescence emission intensity can be obtained by introducing a fluorene group into the azo‐bridged coumarin‐based π‐conjugated framework. The geometry structures and frontier orbitals are calculated by the ab initio Hartree–Fock method.</div></front></TEI><affiliations><list><country><li>République populaire de Chine</li></country><region><li>Guangdong</li></region><settlement><li>Jiangmen</li></settlement></list><tree><country name="République populaire de Chine"><region name="Guangdong"><name sortKey="Sun, Yi Eng" sort="Sun, Yi Eng" uniqKey="Sun Y" first="Yi‐Feng" last="Sun">Yi‐Feng Sun</name></region><name sortKey="Chen, Jiang An" sort="Chen, Jiang An" uniqKey="Chen J" first="Jiang‐Han" last="Chen">Jiang‐Han Chen</name><name sortKey="Chen, Zhi Ong" sort="Chen, Zhi Ong" uniqKey="Chen Z" first="Zhi‐Yong" last="Chen">Zhi‐Yong Chen</name><name sortKey="Pan, Wen Ong" sort="Pan, Wen Ong" uniqKey="Pan W" first="Wen‐Long" last="Pan">Wen‐Long Pan</name><name sortKey="Song, Hua An" sort="Song, Hua An" uniqKey="Song H" first="Hua‐Can" last="Song">Hua‐Can Song</name><name sortKey="Song, Hua An" sort="Song, Hua An" uniqKey="Song H" first="Hua‐Can" last="Song">Hua‐Can Song</name><name sortKey="Xu, Shu Ong" sort="Xu, Shu Ong" uniqKey="Xu S" first="Shu‐Hong" last="Xu">Shu‐Hong Xu</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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